diff --git a/App.tsx b/App.tsx
index b50611a..18cecb2 100644
--- a/App.tsx
+++ b/App.tsx
@@ -1,4 +1,4 @@
-import React from 'react';
+import React, { useState } from 'react';
 import { useAuth } from 'react-oidc-context';
 import { useGame } from './hooks/useGame';
 import { useQuizLibrary } from './hooks/useQuizLibrary';
@@ -11,6 +11,7 @@ import { QuizCreator } from './components/QuizCreator';
 import { RevealScreen } from './components/RevealScreen';
 import { SaveQuizPrompt } from './components/SaveQuizPrompt';
 import { QuizEditor } from './components/QuizEditor';
+import { SaveOptionsModal } from './components/SaveOptionsModal';
 import type { Quiz } from './types';
 
 const seededRandom = (seed: number) => {
@@ -40,7 +41,9 @@ const FloatingShapes = React.memo(() => {
 
 function App() {
   const auth = useAuth();
-  const { saveQuiz } = useQuizLibrary();
+  const { saveQuiz, updateQuiz, saving } = useQuizLibrary();
+  const [showSaveOptions, setShowSaveOptions] = useState(false);
+  const [pendingEditedQuiz, setPendingEditedQuiz] = useState<Quiz | null>(null);
   const {
     role,
     gameState,
@@ -85,12 +88,33 @@ function App() {
   const handleEditorSave = async (editedQuiz: Quiz) => {
     updateQuizFromEditor(editedQuiz);
     if (auth.isAuthenticated) {
-      const source = pendingQuizToSave?.topic ? 'ai_generated' : 'manual';
-      const topic = pendingQuizToSave?.topic || undefined;
-      await saveQuiz(editedQuiz, source, topic);
+      if (sourceQuizId) {
+        // Quiz was loaded from library - show options modal
+        setPendingEditedQuiz(editedQuiz);
+        setShowSaveOptions(true);
+      } else {
+        // New quiz (AI-generated or manual) - save as new
+        const source = pendingQuizToSave?.topic ? 'ai_generated' : 'manual';
+        const topic = pendingQuizToSave?.topic || undefined;
+        await saveQuiz(editedQuiz, source, topic);
+      }
     }
   };
 
+  const handleOverwriteQuiz = async () => {
+    if (!pendingEditedQuiz || !sourceQuizId) return;
+    await updateQuiz(sourceQuizId, pendingEditedQuiz);
+    setShowSaveOptions(false);
+    setPendingEditedQuiz(null);
+  };
+
+  const handleSaveAsNew = async () => {
+    if (!pendingEditedQuiz) return;
+    await saveQuiz(pendingEditedQuiz, 'manual');
+    setShowSaveOptions(false);
+    setPendingEditedQuiz(null);
+  };
+
   const currentQ = quiz?.questions[currentQuestionIndex];
   
   // Logic to find correct option, handling both Host (has isCorrect flag) and Client (masked, needs shape)
@@ -204,6 +228,17 @@ function App() {
           />
         ) : null}
       </div>
+
+      <SaveOptionsModal
+        isOpen={showSaveOptions}
+        onClose={() => {
+          setShowSaveOptions(false);
+          setPendingEditedQuiz(null);
+        }}
+        onOverwrite={handleOverwriteQuiz}
+        onSaveNew={handleSaveAsNew}
+        isSaving={saving}
+      />
     </div>
   );
 }
diff --git a/components/QuizEditor.tsx b/components/QuizEditor.tsx
index 97d275b..65b9a5a 100644
--- a/components/QuizEditor.tsx
+++ b/components/QuizEditor.tsx
@@ -13,7 +13,7 @@ interface QuizEditorProps {
   onSave: (quiz: Quiz) => void;
   onStartGame: (quiz: Quiz) => void;
   onBack: () => void;
-  sourceQuizId?: string | null;
+  showSaveButton?: boolean;
   isSaving?: boolean;
 }
 
@@ -22,7 +22,7 @@ export const QuizEditor: React.FC<QuizEditorProps> = ({
   onSave,
   onStartGame,
   onBack,
-  sourceQuizId,
+  showSaveButton = true,
   isSaving
 }) => {
   const [quiz, setQuiz] = useState<Quiz>(initialQuiz);
@@ -146,14 +146,17 @@ export const QuizEditor: React.FC<QuizEditorProps> = ({
               </p>
             </div>
             
-            <button
-              onClick={() => onSave(quiz)}
-              disabled={isSaving}
-              className="bg-white/20 p-2 rounded-full hover:bg-white/30 transition disabled:opacity-50"
-              title={sourceQuizId ? 'Save changes' : 'Save to library'}
-            >
-              <Save size={24} />
-            </button>
+            {showSaveButton && (
+              <button
+                onClick={() => onSave(quiz)}
+                disabled={isSaving}
+                className="bg-white/20 p-2 rounded-full hover:bg-white/30 transition disabled:opacity-50"
+                title="Save to library"
+              >
+                <Save size={24} />
+              </button>
+            )}
+            {!showSaveButton && <div className="w-10" />}
           </div>
           
           <div className="absolute -right-10 -top-10 w-40 h-40 bg-white/10 rounded-full"></div>
diff --git a/components/SaveOptionsModal.tsx b/components/SaveOptionsModal.tsx
new file mode 100644
index 0000000..8c99061
--- /dev/null
+++ b/components/SaveOptionsModal.tsx
@@ -0,0 +1,83 @@
+import React from 'react';
+import { motion } from 'framer-motion';
+import { Save, Copy, X } from 'lucide-react';
+
+interface SaveOptionsModalProps {
+  isOpen: boolean;
+  onClose: () => void;
+  onSaveNew: () => void;
+  onOverwrite: () => void;
+  isSaving?: boolean;
+}
+
+export const SaveOptionsModal: React.FC<SaveOptionsModalProps> = ({
+  isOpen,
+  onClose,
+  onSaveNew,
+  onOverwrite,
+  isSaving
+}) => {
+  if (!isOpen) return null;
+
+  return (
+    <motion.div
+      initial={{ opacity: 0 }}
+      animate={{ opacity: 1 }}
+      exit={{ opacity: 0 }}
+      className="fixed inset-0 bg-black/50 flex items-center justify-center z-50 p-4"
+      onClick={onClose}
+    >
+      <motion.div
+        initial={{ scale: 0.9, opacity: 0 }}
+        animate={{ scale: 1, opacity: 1 }}
+        exit={{ scale: 0.9, opacity: 0 }}
+        className="bg-white rounded-2xl p-6 max-w-sm w-full shadow-xl"
+        onClick={(e) => e.stopPropagation()}
+      >
+        <div className="flex items-center justify-between mb-4">
+          <h3 className="text-xl font-black text-gray-900">Save Quiz</h3>
+          <button
+            onClick={onClose}
+            className="p-2 hover:bg-gray-100 rounded-lg transition"
+          >
+            <X size={20} />
+          </button>
+        </div>
+        
+        <p className="text-gray-600 mb-6">
+          This quiz was loaded from your library. How would you like to save your changes?
+        </p>
+        
+        <div className="space-y-3">
+          <button
+            onClick={onOverwrite}
+            disabled={isSaving}
+            className="w-full flex items-center gap-3 p-4 rounded-xl border-2 border-theme-primary bg-theme-primary/5 hover:bg-theme-primary/10 transition disabled:opacity-50"
+          >
+            <div className="p-2 bg-theme-primary rounded-lg">
+              <Save size={20} className="text-white" />
+            </div>
+            <div className="text-left">
+              <p className="font-bold text-gray-900">Update existing quiz</p>
+              <p className="text-sm text-gray-500">Overwrite the original with your changes</p>
+            </div>
+          </button>
+          
+          <button
+            onClick={onSaveNew}
+            disabled={isSaving}
+            className="w-full flex items-center gap-3 p-4 rounded-xl border-2 border-gray-200 hover:border-gray-300 hover:bg-gray-50 transition disabled:opacity-50"
+          >
+            <div className="p-2 bg-gray-200 rounded-lg">
+              <Copy size={20} className="text-gray-600" />
+            </div>
+            <div className="text-left">
+              <p className="font-bold text-gray-900">Save as new quiz</p>
+              <p className="text-sm text-gray-500">Keep the original and create a copy</p>
+            </div>
+          </button>
+        </div>
+      </motion.div>
+    </motion.div>
+  );
+};
diff --git a/hooks/useQuizLibrary.ts b/hooks/useQuizLibrary.ts
index 976f82f..35c8187 100644
--- a/hooks/useQuizLibrary.ts
+++ b/hooks/useQuizLibrary.ts
@@ -13,6 +13,7 @@ interface UseQuizLibraryReturn {
   fetchQuizzes: () => Promise<void>;
   loadQuiz: (id: string) => Promise<SavedQuiz>;
   saveQuiz: (quiz: Quiz, source: QuizSource, aiTopic?: string) => Promise<string>;
+  updateQuiz: (id: string, quiz: Quiz) => Promise<void>;
   deleteQuiz: (id: string) => Promise<void>;
   retry: () => Promise<void>;
   clearError: () => void;
@@ -160,6 +161,48 @@ export const useQuizLibrary = (): UseQuizLibraryReturn => {
     }
   }, [authFetch]);
 
+  const updateQuiz = useCallback(async (id: string, quiz: Quiz): Promise<void> => {
+    setSaving(true);
+    setError(null);
+    
+    try {
+      const response = await authFetch(`/api/quizzes/${id}`, {
+        method: 'PUT',
+        body: JSON.stringify({
+          title: quiz.title,
+          questions: quiz.questions.map(q => ({
+            text: q.text,
+            timeLimit: q.timeLimit,
+            options: q.options.map(o => ({
+              text: o.text,
+              isCorrect: o.isCorrect,
+              shape: o.shape,
+              color: o.color,
+              reason: o.reason,
+            })),
+          })),
+        }),
+      });
+
+      if (!response.ok) {
+        const errorText = response.status === 404 
+          ? 'Quiz not found.' 
+          : 'Failed to update quiz.';
+        throw new Error(errorText);
+      }
+
+      toast.success('Quiz updated!');
+    } catch (err) {
+      const message = err instanceof Error ? err.message : 'Failed to update quiz';
+      if (!message.includes('redirecting')) {
+        toast.error(message);
+      }
+      throw err;
+    } finally {
+      setSaving(false);
+    }
+  }, [authFetch]);
+
   const deleteQuiz = useCallback(async (id: string): Promise<void> => {
     setDeletingQuizId(id);
     setError(null);
@@ -209,6 +252,7 @@ export const useQuizLibrary = (): UseQuizLibraryReturn => {
     fetchQuizzes,
     loadQuiz,
     saveQuiz,
+    updateQuiz,
     deleteQuiz,
     retry,
     clearError,
diff --git a/package-lock.json b/package-lock.json
index d29d414..7323a05 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -25,12 +25,87 @@
         "uuid": "^13.0.0"
       },
       "devDependencies": {
+        "@testing-library/jest-dom": "^6.9.1",
+        "@testing-library/react": "^16.3.1",
+        "@testing-library/user-event": "^14.6.1",
         "@types/node": "^22.14.0",
         "@vitejs/plugin-react": "^5.0.0",
+        "@vitest/coverage-v8": "^4.0.17",
+        "jsdom": "^27.4.0",
         "typescript": "~5.8.2",
-        "vite": "^6.2.0"
+        "vite": "^6.2.0",
+        "vitest": "^4.0.17"
       }
     },
+    "node_modules/@acemir/cssom": {
+      "version": "0.9.31",
+      "resolved": "https://registry.npmjs.org/@acemir/cssom/-/cssom-0.9.31.tgz",
+      "integrity": "sha512-ZnR3GSaH+/vJ0YlHau21FjfLYjMpYVIzTD8M8vIEQvIGxeOXyXdzCI140rrCY862p/C/BbzWsjc1dgnM9mkoTA==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@adobe/css-tools": {
+      "version": "4.4.4",
+      "resolved": "https://registry.npmjs.org/@adobe/css-tools/-/css-tools-4.4.4.tgz",
+      "integrity": "sha512-Elp+iwUx5rN5+Y8xLt5/GRoG20WGoDCQ/1Fb+1LiGtvwbDavuSk0jhD/eZdckHAuzcDzccnkv+rEjyWfRx18gg==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@asamuzakjp/css-color": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/@asamuzakjp/css-color/-/css-color-4.1.1.tgz",
+      "integrity": "sha512-B0Hv6G3gWGMn0xKJ0txEi/jM5iFpT3MfDxmhZFb4W047GvytCf1DHQ1D69W3zHI4yWe2aTZAA0JnbMZ7Xc8DuQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@csstools/css-calc": "^2.1.4",
+        "@csstools/css-color-parser": "^3.1.0",
+        "@csstools/css-parser-algorithms": "^3.0.5",
+        "@csstools/css-tokenizer": "^3.0.4",
+        "lru-cache": "^11.2.4"
+      }
+    },
+    "node_modules/@asamuzakjp/css-color/node_modules/lru-cache": {
+      "version": "11.2.4",
+      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-11.2.4.tgz",
+      "integrity": "sha512-B5Y16Jr9LB9dHVkh6ZevG+vAbOsNOYCX+sXvFWFu7B3Iz5mijW3zdbMyhsh8ANd2mSWBYdJgnqi+mL7/LrOPYg==",
+      "dev": true,
+      "license": "BlueOak-1.0.0",
+      "engines": {
+        "node": "20 || >=22"
+      }
+    },
+    "node_modules/@asamuzakjp/dom-selector": {
+      "version": "6.7.6",
+      "resolved": "https://registry.npmjs.org/@asamuzakjp/dom-selector/-/dom-selector-6.7.6.tgz",
+      "integrity": "sha512-hBaJER6A9MpdG3WgdlOolHmbOYvSk46y7IQN/1+iqiCuUu6iWdQrs9DGKF8ocqsEqWujWf/V7b7vaDgiUmIvUg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@asamuzakjp/nwsapi": "^2.3.9",
+        "bidi-js": "^1.0.3",
+        "css-tree": "^3.1.0",
+        "is-potential-custom-element-name": "^1.0.1",
+        "lru-cache": "^11.2.4"
+      }
+    },
+    "node_modules/@asamuzakjp/dom-selector/node_modules/lru-cache": {
+      "version": "11.2.4",
+      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-11.2.4.tgz",
+      "integrity": "sha512-B5Y16Jr9LB9dHVkh6ZevG+vAbOsNOYCX+sXvFWFu7B3Iz5mijW3zdbMyhsh8ANd2mSWBYdJgnqi+mL7/LrOPYg==",
+      "dev": true,
+      "license": "BlueOak-1.0.0",
+      "engines": {
+        "node": "20 || >=22"
+      }
+    },
+    "node_modules/@asamuzakjp/nwsapi": {
+      "version": "2.3.9",
+      "resolved": "https://registry.npmjs.org/@asamuzakjp/nwsapi/-/nwsapi-2.3.9.tgz",
+      "integrity": "sha512-n8GuYSrI9bF7FFZ/SjhwevlHc8xaVlb/7HmHelnc/PZXBD2ZR49NnN9sMMuDdEGPeeRQ5d0hqlSlEpgCX3Wl0Q==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@babel/code-frame": {
       "version": "7.28.6",
       "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.28.6.tgz",
@@ -266,6 +341,16 @@
         "@babel/core": "^7.0.0-0"
       }
     },
+    "node_modules/@babel/runtime": {
+      "version": "7.28.6",
+      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.28.6.tgz",
+      "integrity": "sha512-05WQkdpL9COIMz4LjTxGpPNCdlpyimKppYNoJ5Di5EUObifl8t4tuLuUBBZEpoLYOmfvIWrsp9fCl0HoPRVTdA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
     "node_modules/@babel/template": {
       "version": "7.28.6",
       "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.28.6.tgz",
@@ -314,6 +399,153 @@
         "node": ">=6.9.0"
       }
     },
+    "node_modules/@bcoe/v8-coverage": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/@bcoe/v8-coverage/-/v8-coverage-1.0.2.tgz",
+      "integrity": "sha512-6zABk/ECA/QYSCQ1NGiVwwbQerUCZ+TQbp64Q3AgmfNvurHH0j8TtXa1qbShXA6qqkpAj4V5W8pP6mLe1mcMqA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@csstools/color-helpers": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/@csstools/color-helpers/-/color-helpers-5.1.0.tgz",
+      "integrity": "sha512-S11EXWJyy0Mz5SYvRmY8nJYTFFd1LCNV+7cXyAgQtOOuzb4EsgfqDufL+9esx72/eLhsRdGZwaldu/h+E4t4BA==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT-0",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@csstools/css-calc": {
+      "version": "2.1.4",
+      "resolved": "https://registry.npmjs.org/@csstools/css-calc/-/css-calc-2.1.4.tgz",
+      "integrity": "sha512-3N8oaj+0juUw/1H3YwmDDJXCgTB1gKU6Hc/bB502u9zR0q2vd786XJH9QfrKIEgFlZmhZiq6epXl4rHqhzsIgQ==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      },
+      "peerDependencies": {
+        "@csstools/css-parser-algorithms": "^3.0.5",
+        "@csstools/css-tokenizer": "^3.0.4"
+      }
+    },
+    "node_modules/@csstools/css-color-parser": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/@csstools/css-color-parser/-/css-color-parser-3.1.0.tgz",
+      "integrity": "sha512-nbtKwh3a6xNVIp/VRuXV64yTKnb1IjTAEEh3irzS+HkKjAOYLTGNb9pmVNntZ8iVBHcWDA2Dof0QtPgFI1BaTA==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "@csstools/color-helpers": "^5.1.0",
+        "@csstools/css-calc": "^2.1.4"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "peerDependencies": {
+        "@csstools/css-parser-algorithms": "^3.0.5",
+        "@csstools/css-tokenizer": "^3.0.4"
+      }
+    },
+    "node_modules/@csstools/css-parser-algorithms": {
+      "version": "3.0.5",
+      "resolved": "https://registry.npmjs.org/@csstools/css-parser-algorithms/-/css-parser-algorithms-3.0.5.tgz",
+      "integrity": "sha512-DaDeUkXZKjdGhgYaHNJTV9pV7Y9B3b644jCLs9Upc3VeNGg6LWARAT6O+Q+/COo+2gg/bM5rhpMAtf70WqfBdQ==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "peer": true,
+      "engines": {
+        "node": ">=18"
+      },
+      "peerDependencies": {
+        "@csstools/css-tokenizer": "^3.0.4"
+      }
+    },
+    "node_modules/@csstools/css-syntax-patches-for-csstree": {
+      "version": "1.0.25",
+      "resolved": "https://registry.npmjs.org/@csstools/css-syntax-patches-for-csstree/-/css-syntax-patches-for-csstree-1.0.25.tgz",
+      "integrity": "sha512-g0Kw9W3vjx5BEBAF8c5Fm2NcB/Fs8jJXh85aXqwEXiL+tqtOut07TWgyaGzAAfTM+gKckrrncyeGEZPcaRgm2Q==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT-0",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@csstools/css-tokenizer": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/@csstools/css-tokenizer/-/css-tokenizer-3.0.4.tgz",
+      "integrity": "sha512-Vd/9EVDiu6PPJt9yAh6roZP6El1xHrdvIVGjyBsHR0RYwNHgL7FJPyIIW4fANJNG6FtyZfvlRPpFI4ZM/lubvw==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "peer": true,
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/@dnd-kit/accessibility": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/@dnd-kit/accessibility/-/accessibility-3.1.1.tgz",
@@ -810,6 +1042,24 @@
         "node": ">=18"
       }
     },
+    "node_modules/@exodus/bytes": {
+      "version": "1.8.0",
+      "resolved": "https://registry.npmjs.org/@exodus/bytes/-/bytes-1.8.0.tgz",
+      "integrity": "sha512-8JPn18Bcp8Uo1T82gR8lh2guEOa5KKU/IEKvvdp0sgmi7coPBWf1Doi1EXsGZb2ehc8ym/StJCjffYV+ne7sXQ==",
+      "dev": true,
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+      "integrity": "sha512-Cxwpt2SfTzTtXcfOlzGEee8O+c+MmUgGrNiBcXnuWxuFJHe6a5Hz7qwhwe5OgaSYI0IJvkLqWX1ASG+cJOkEiA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
+    "node_modules/pretty-format/node_modules/react-is": {
+      "version": "17.0.2",
+      "resolved": "https://registry.npmjs.org/react-is/-/react-is-17.0.2.tgz",
+      "integrity": "sha512-w2GsyukL62IJnlaff/nRegPQR94C/XXamvMWmSHRJ4y7Ts/4ocGRmTHvOs8PSE6pB3dWOrD/nueuU5sduBsQ4w==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/punycode": {
+      "version": "2.3.1",
+      "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.3.1.tgz",
+      "integrity": "sha512-vYt7UD1U9Wg6138shLtLOvdAu+8DsC/ilFtEVHcH+wydcSpNE20AfSOduf6MkRFahL5FY7X1oU7nKVZFtfq8Fg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/react": {
       "version": "19.2.3",
       "resolved": "https://registry.npmjs.org/react/-/react-19.2.3.tgz",
@@ -2687,6 +3683,20 @@
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       "license": "MIT"
     },
+    "node_modules/redent": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/redent/-/redent-3.0.0.tgz",
+      "integrity": "sha512-6tDA8g98We0zd0GvVeMT9arEOnTw9qM03L9cJXaCjrip1OO764RDBLBfrB4cwzNGDj5OA5ioymC9GkizgWJDUg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "indent-string": "^4.0.0",
+        "strip-indent": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/redux": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/redux/-/redux-5.0.1.tgz",
@@ -2703,6 +3713,16 @@
         "redux": "^5.0.0"
       }
     },
+    "node_modules/require-from-string": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/require-from-string/-/require-from-string-2.0.2.tgz",
+      "integrity": "sha512-Xf0nWe6RseziFMu+Ap9biiUbmplq6S9/p+7w7YXP/JBHhrUDDUhwa+vANyubuqfZWTveU//DYVGsDG7RKL/vEw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/reselect": {
       "version": "5.1.1",
       "resolved": "https://registry.npmjs.org/reselect/-/reselect-5.1.1.tgz",
@@ -2789,6 +3809,19 @@
       ],
       "license": "MIT"
     },
+    "node_modules/saxes": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/saxes/-/saxes-6.0.0.tgz",
+      "integrity": "sha512-xAg7SOnEhrm5zI3puOOKyy1OMcMlIJZYNJY7xLBwSze0UjhPLnWfj2GF2EpT0jmzaJKIWKHLsaSSajf35bcYnA==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "xmlchars": "^2.2.0"
+      },
+      "engines": {
+        "node": ">=v12.22.7"
+      }
+    },
     "node_modules/scheduler": {
       "version": "0.27.0",
       "resolved": "https://registry.npmjs.org/scheduler/-/scheduler-0.27.0.tgz",
@@ -2832,6 +3865,13 @@
         "node": ">=8"
       }
     },
+    "node_modules/siginfo": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/siginfo/-/siginfo-2.0.0.tgz",
+      "integrity": "sha512-ybx0WO1/8bSBLEWXZvEd7gMW3Sn3JFlW3TvX1nREbDLRNQNaeNN8WK0meBwPdAaOI7TtRRRJn/Es1zhrrCHu7g==",
+      "dev": true,
+      "license": "ISC"
+    },
     "node_modules/signal-exit": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-4.1.0.tgz",
@@ -2854,6 +3894,20 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/stackback": {
+      "version": "0.0.2",
+      "resolved": "https://registry.npmjs.org/stackback/-/stackback-0.0.2.tgz",
+      "integrity": "sha512-1XMJE5fQo1jGH6Y/7ebnwPOBEkIEnT4QF32d5R1+VXdXveM0IBMJt8zfaxX1P3QhVwrYe+576+jkANtSS2mBbw==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/std-env": {
+      "version": "3.10.0",
+      "resolved": "https://registry.npmjs.org/std-env/-/std-env-3.10.0.tgz",
+      "integrity": "sha512-5GS12FdOZNliM5mAOxFRg7Ir0pWz8MdpYm6AY6VPkGpbA7ZzmbzNcBJQ0GPvvyWgcY7QAhCgf9Uy89I03faLkg==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/string-width": {
       "version": "5.1.2",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-5.1.2.tgz",
@@ -2950,12 +4004,62 @@
         "node": ">=8"
       }
     },
+    "node_modules/strip-indent": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/strip-indent/-/strip-indent-3.0.0.tgz",
+      "integrity": "sha512-laJTa3Jb+VQpaC6DseHhF7dXVqHTfJPCRDaEbid/drOhgitgYku/letMUqOXFoWV0zIIUbjpdH2t+tYj4bQMRQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "min-indent": "^1.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/supports-color": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
+      "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "has-flag": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/symbol-tree": {
+      "version": "3.2.4",
+      "resolved": "https://registry.npmjs.org/symbol-tree/-/symbol-tree-3.2.4.tgz",
+      "integrity": "sha512-9QNk5KwDF+Bvz+PyObkmSYjI5ksVUYtjW7AU22r2NKcfLJcXp96hkDWU3+XndOsUb+AQ9QhfzfCT2O+CNWT5Tw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/tiny-invariant": {
       "version": "1.3.3",
       "resolved": "https://registry.npmjs.org/tiny-invariant/-/tiny-invariant-1.3.3.tgz",
       "integrity": "sha512-+FbBPE1o9QAYvviau/qC5SE3caw21q3xkvWKBtja5vgqOWIHHJ3ioaq1VPfn/Szqctz2bU/oYeKd9/z5BL+PVg==",
       "license": "MIT"
     },
+    "node_modules/tinybench": {
+      "version": "2.9.0",
+      "resolved": "https://registry.npmjs.org/tinybench/-/tinybench-2.9.0.tgz",
+      "integrity": "sha512-0+DUvqWMValLmha6lr4kD8iAMK1HzV0/aKnCtWb9v9641TnP/MFb7Pc2bxoxQjTXAErryXVgUOfv2YqNllqGeg==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/tinyexec": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/tinyexec/-/tinyexec-1.0.2.tgz",
+      "integrity": "sha512-W/KYk+NFhkmsYpuHq5JykngiOCnxeVL8v8dFnqxSD8qEEdRfXk1SDM6JzNqcERbcGYj9tMrDQBYV9cjgnunFIg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/tinyglobby": {
       "version": "0.2.15",
       "resolved": "https://registry.npmjs.org/tinyglobby/-/tinyglobby-0.2.15.tgz",
@@ -2973,6 +4077,62 @@
         "url": "https://github.com/sponsors/SuperchupuDev"
       }
     },
+    "node_modules/tinyrainbow": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/tinyrainbow/-/tinyrainbow-3.0.3.tgz",
+      "integrity": "sha512-PSkbLUoxOFRzJYjjxHJt9xro7D+iilgMX/C9lawzVuYiIdcihh9DXmVibBe8lmcFrRi/VzlPjBxbN7rH24q8/Q==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=14.0.0"
+      }
+    },
+    "node_modules/tldts": {
+      "version": "7.0.19",
+      "resolved": "https://registry.npmjs.org/tldts/-/tldts-7.0.19.tgz",
+      "integrity": "sha512-8PWx8tvC4jDB39BQw1m4x8y5MH1BcQ5xHeL2n7UVFulMPH/3Q0uiamahFJ3lXA0zO2SUyRXuVVbWSDmstlt9YA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "tldts-core": "^7.0.19"
+      },
+      "bin": {
+        "tldts": "bin/cli.js"
+      }
+    },
+    "node_modules/tldts-core": {
+      "version": "7.0.19",
+      "resolved": "https://registry.npmjs.org/tldts-core/-/tldts-core-7.0.19.tgz",
+      "integrity": "sha512-lJX2dEWx0SGH4O6p+7FPwYmJ/bu1JbcGJ8RLaG9b7liIgZ85itUVEPbMtWRVrde/0fnDPEPHW10ZsKW3kVsE9A==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/tough-cookie": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-6.0.0.tgz",
+      "integrity": "sha512-kXuRi1mtaKMrsLUxz3sQYvVl37B0Ns6MzfrtV5DvJceE9bPyspOqk9xxv7XbZWcfLWbFmm997vl83qUWVJA64w==",
+      "dev": true,
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "tldts": "^7.0.5"
+      },
+      "engines": {
+        "node": ">=16"
+      }
+    },
+    "node_modules/tr46": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/tr46/-/tr46-6.0.0.tgz",
+      "integrity": "sha512-bLVMLPtstlZ4iMQHpFHTR7GAGj2jxi8Dg0s2h2MafAE4uSWF98FC/3MomU51iQAMf8/qDUbKWf5GxuvvVcXEhw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "punycode": "^2.3.1"
+      },
+      "engines": {
+        "node": ">=20"
+      }
+    },
     "node_modules/tslib": {
       "version": "2.8.1",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
@@ -3151,6 +4311,98 @@
         }
       }
     },
+    "node_modules/vitest": {
+      "version": "4.0.17",
+      "resolved": "https://registry.npmjs.org/vitest/-/vitest-4.0.17.tgz",
+      "integrity": "sha512-FQMeF0DJdWY0iOnbv466n/0BudNdKj1l5jYgl5JVTwjSsZSlqyXFt/9+1sEyhR6CLowbZpV7O1sCHrzBhucKKg==",
+      "dev": true,
+      "license": "MIT",
+      "peer": true,
+      "dependencies": {
+        "@vitest/expect": "4.0.17",
+        "@vitest/mocker": "4.0.17",
+        "@vitest/pretty-format": "4.0.17",
+        "@vitest/runner": "4.0.17",
+        "@vitest/snapshot": "4.0.17",
+        "@vitest/spy": "4.0.17",
+        "@vitest/utils": "4.0.17",
+        "es-module-lexer": "^1.7.0",
+        "expect-type": "^1.2.2",
+        "magic-string": "^0.30.21",
+        "obug": "^2.1.1",
+        "pathe": "^2.0.3",
+        "picomatch": "^4.0.3",
+        "std-env": "^3.10.0",
+        "tinybench": "^2.9.0",
+        "tinyexec": "^1.0.2",
+        "tinyglobby": "^0.2.15",
+        "tinyrainbow": "^3.0.3",
+        "vite": "^6.0.0 || ^7.0.0",
+        "why-is-node-running": "^2.3.0"
+      },
+      "bin": {
+        "vitest": "vitest.mjs"
+      },
+      "engines": {
+        "node": "^20.0.0 || ^22.0.0 || >=24.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "@edge-runtime/vm": "*",
+        "@opentelemetry/api": "^1.9.0",
+        "@types/node": "^20.0.0 || ^22.0.0 || >=24.0.0",
+        "@vitest/browser-playwright": "4.0.17",
+        "@vitest/browser-preview": "4.0.17",
+        "@vitest/browser-webdriverio": "4.0.17",
+        "@vitest/ui": "4.0.17",
+        "happy-dom": "*",
+        "jsdom": "*"
+      },
+      "peerDependenciesMeta": {
+        "@edge-runtime/vm": {
+          "optional": true
+        },
+        "@opentelemetry/api": {
+          "optional": true
+        },
+        "@types/node": {
+          "optional": true
+        },
+        "@vitest/browser-playwright": {
+          "optional": true
+        },
+        "@vitest/browser-preview": {
+          "optional": true
+        },
+        "@vitest/browser-webdriverio": {
+          "optional": true
+        },
+        "@vitest/ui": {
+          "optional": true
+        },
+        "happy-dom": {
+          "optional": true
+        },
+        "jsdom": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/w3c-xmlserializer": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/w3c-xmlserializer/-/w3c-xmlserializer-5.0.0.tgz",
+      "integrity": "sha512-o8qghlI8NZHU1lLPrpi2+Uq7abh4GGPpYANlalzWxyWteJOCsr/P+oPBA49TOLu5FTZO4d3F9MnWJfiMo4BkmA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "xml-name-validator": "^5.0.0"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/web-streams-polyfill": {
       "version": "3.3.3",
       "resolved": "https://registry.npmjs.org/web-streams-polyfill/-/web-streams-polyfill-3.3.3.tgz",
@@ -3160,6 +4412,16 @@
         "node": ">= 8"
       }
     },
+    "node_modules/webidl-conversions": {
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-8.0.1.tgz",
+      "integrity": "sha512-BMhLD/Sw+GbJC21C/UgyaZX41nPt8bUTg+jWyDeg7e7YN4xOM05YPSIXceACnXVtqyEw/LMClUQMtMZ+PGGpqQ==",
+      "dev": true,
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=20"
+      }
+    },
     "node_modules/webrtc-adapter": {
       "version": "9.0.3",
       "resolved": "https://registry.npmjs.org/webrtc-adapter/-/webrtc-adapter-9.0.3.tgz",
@@ -3173,6 +4435,30 @@
         "npm": ">=3.10.0"
       }
     },
+    "node_modules/whatwg-mimetype": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-4.0.0.tgz",
+      "integrity": "sha512-QaKxh0eNIi2mE9p2vEdzfagOKHCcj1pJ56EEHGQOVxp8r9/iszLUUV7v89x9O1p/T+NlTM5W7jW6+cz4Fq1YVg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/whatwg-url": {
+      "version": "15.1.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-15.1.0.tgz",
+      "integrity": "sha512-2ytDk0kiEj/yu90JOAp44PVPUkO9+jVhyf+SybKlRHSDlvOOZhdPIrr7xTH64l4WixO2cP+wQIcgujkGBPPz6g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "tr46": "^6.0.0",
+        "webidl-conversions": "^8.0.0"
+      },
+      "engines": {
+        "node": ">=20"
+      }
+    },
     "node_modules/which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
@@ -3188,6 +4474,23 @@
         "node": ">= 8"
       }
     },
+    "node_modules/why-is-node-running": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.3.0.tgz",
+      "integrity": "sha512-hUrmaWBdVDcxvYqnyh09zunKzROWjbZTiNy8dBEjkS7ehEDQibXJ7XvlmtbwuTclUiIyN+CyXQD4Vmko8fNm8w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "siginfo": "^2.0.0",
+        "stackback": "0.0.2"
+      },
+      "bin": {
+        "why-is-node-running": "cli.js"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/wrap-ansi": {
       "version": "8.1.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-8.1.0.tgz",
@@ -3300,6 +4603,23 @@
         }
       }
     },
+    "node_modules/xml-name-validator": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-5.0.0.tgz",
+      "integrity": "sha512-EvGK8EJ3DhaHfbRlETOWAS5pO9MZITeauHKJyb8wyajUfQUenkIg2MvLDTZ4T/TgIcm3HU0TFBgWWboAZ30UHg==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/xmlchars": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.2.0.tgz",
+      "integrity": "sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/yallist": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
diff --git a/package.json b/package.json
index 8f9d39c..72eb488 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,10 @@
   "scripts": {
     "dev": "vite",
     "build": "vite build",
-    "preview": "vite preview"
+    "preview": "vite preview",
+    "test": "vitest",
+    "test:run": "vitest run",
+    "test:coverage": "vitest run --coverage"
   },
   "dependencies": {
     "@dnd-kit/core": "^6.3.1",
@@ -26,9 +29,15 @@
     "uuid": "^13.0.0"
   },
   "devDependencies": {
+    "@testing-library/jest-dom": "^6.9.1",
+    "@testing-library/react": "^16.3.1",
+    "@testing-library/user-event": "^14.6.1",
     "@types/node": "^22.14.0",
     "@vitejs/plugin-react": "^5.0.0",
+    "@vitest/coverage-v8": "^4.0.17",
+    "jsdom": "^27.4.0",
     "typescript": "~5.8.2",
-    "vite": "^6.2.0"
+    "vite": "^6.2.0",
+    "vitest": "^4.0.17"
   }
 }
diff --git a/server/tests/api.test.ts b/server/tests/api.test.ts
index 4d108a2..8be303f 100644
--- a/server/tests/api.test.ts
+++ b/server/tests/api.test.ts
@@ -941,6 +941,322 @@ async function runTests() {
     await request('DELETE', `/api/quizzes/${quizId}`, undefined, 204);
   });
 
+  console.log('\nPUT Endpoint Edge Case Tests:');
+
+  await test('PUT /api/quizzes/:id with whitespace-only title returns 400', async () => {
+    const validQuiz = {
+      title: 'Quiz for PUT whitespace test',
+      source: 'manual',
+      questions: [
+        {
+          text: 'Question?',
+          options: [
+            { text: 'A', isCorrect: true, shape: 'triangle', color: 'red' },
+            { text: 'B', isCorrect: false, shape: 'diamond', color: 'blue' },
+          ],
+        },
+      ],
+    };
+
+    const { data } = await request('POST', '/api/quizzes', validQuiz, 201);
+    const quizId = (data as { id: string }).id;
+
+    const invalidUpdate = {
+      title: '   ',
+      questions: [
+        {
+          text: 'Q?',
+          options: [
+            { text: 'A', isCorrect: true, shape: 'triangle', color: 'red' },
+            { text: 'B', isCorrect: false, shape: 'diamond', color: 'blue' },
+          ],
+        },
+      ],
+    };
+
+    await request('PUT', `/api/quizzes/${quizId}`, invalidUpdate, 400);
+    await request('DELETE', `/api/quizzes/${quizId}`, undefined, 204);
+  });
+
+  await test('PUT /api/quizzes/:id with question without text returns 400', async () => {
+    const validQuiz = {
+      title: 'Quiz for PUT empty question test',
+      source: 'manual',
+      questions: [
+        {
+          text: 'Original question?',
+          options: [
+            { text: 'A', isCorrect: true, shape: 'triangle', color: 'red' },
+            { text: 'B', isCorrect: false, shape: 'diamond', color: 'blue' },
+          ],
+        },
+      ],
+    };
+
+    const { data } = await request('POST', '/api/quizzes', validQuiz, 201);
+    const quizId = (data as { id: string }).id;
+
+    const invalidUpdate = {
+      title: 'Updated title',
+      questions: [
+        {
+          text: '',
+          options: [
+            { text: 'A', isCorrect: true, shape: 'triangle', color: 'red' },
+            { text: 'B', isCorrect: false, shape: 'diamond', color: 'blue' },
+          ],
+        },
+      ],
+    };
+
+    await request('PUT', `/api/quizzes/${quizId}`, invalidUpdate, 400);
+    await request('DELETE', `/api/quizzes/${quizId}`, undefined, 204);
+  });
+
+  await test('PUT /api/quizzes/:id with single option returns 400', async () => {
+    const validQuiz = {
+      title: 'Quiz for PUT single option test',
+      source: 'manual',
+      questions: [
+        {
+          text: 'Original question?',
+          options: [
+            { text: 'A', isCorrect: true, shape: 'triangle', color: 'red' },
+            { text: 'B', isCorrect: false, shape: 'diamond', color: 'blue' },
+          ],
+        },
+      ],
+    };
+
+    const { data } = await request('POST', '/api/quizzes', validQuiz, 201);
+    const quizId = (data as { id: string }).id;
+
+    const invalidUpdate = {
+      title: 'Updated title',
+      questions: [
+        {
+          text: 'Question with one option?',
+          options: [
+            { text: 'Only one', isCorrect: true, shape: 'triangle', color: 'red' },
+          ],
+        },
+      ],
+    };
+
+    await request('PUT', `/api/quizzes/${quizId}`, invalidUpdate, 400);
+    await request('DELETE', `/api/quizzes/${quizId}`, undefined, 204);
+  });
+
+  await test('PUT /api/quizzes/:id with no correct answer returns 400', async () => {
+    const validQuiz = {
+      title: 'Quiz for PUT no correct test',
+      source: 'manual',
+      questions: [
+        {
+          text: 'Original question?',
+          options: [
+            { text: 'A', isCorrect: true, shape: 'triangle', color: 'red' },
+            { text: 'B', isCorrect: false, shape: 'diamond', color: 'blue' },
+          ],
+        },
+      ],
+    };
+
+    const { data } = await request('POST', '/api/quizzes', validQuiz, 201);
+    const quizId = (data as { id: string }).id;
+
+    const invalidUpdate = {
+      title: 'Updated title',
+      questions: [
+        {
+          text: 'Question with no correct?',
+          options: [
+            { text: 'A', isCorrect: false, shape: 'triangle', color: 'red' },
+            { text: 'B', isCorrect: false, shape: 'diamond', color: 'blue' },
+          ],
+        },
+      ],
+    };
+
+    await request('PUT', `/api/quizzes/${quizId}`, invalidUpdate, 400);
+    await request('DELETE', `/api/quizzes/${quizId}`, undefined, 204);
+  });
+
+  await test('PUT /api/quizzes/:id with null questions returns 400', async () => {
+    const validQuiz = {
+      title: 'Quiz for PUT null questions test',
+      source: 'manual',
+      questions: [
+        {
+          text: 'Original question?',
+          options: [
+            { text: 'A', isCorrect: true, shape: 'triangle', color: 'red' },
+            { text: 'B', isCorrect: false, shape: 'diamond', color: 'blue' },
+          ],
+        },
+      ],
+    };
+
+    const { data } = await request('POST', '/api/quizzes', validQuiz, 201);
+    const quizId = (data as { id: string }).id;
+
+    const invalidUpdate = {
+      title: 'Updated title',
+      questions: null,
+    };
+
+    await request('PUT', `/api/quizzes/${quizId}`, invalidUpdate, 400);
+    await request('DELETE', `/api/quizzes/${quizId}`, undefined, 204);
+  });
+
+  await test('PUT /api/quizzes/:id preserves source and aiTopic', async () => {
+    const aiQuiz = {
+      title: 'AI Quiz for PUT preserve test',
+      source: 'ai_generated',
+      aiTopic: 'History',
+      questions: [
+        {
+          text: 'Original question?',
+          options: [
+            { text: 'A', isCorrect: true, shape: 'triangle', color: 'red' },
+            { text: 'B', isCorrect: false, shape: 'diamond', color: 'blue' },
+          ],
+        },
+      ],
+    };
+
+    const { data } = await request('POST', '/api/quizzes', aiQuiz, 201);
+    const quizId = (data as { id: string }).id;
+
+    const update = {
+      title: 'Updated AI Quiz',
+      questions: [
+        {
+          text: 'New question?',
+          options: [
+            { text: 'X', isCorrect: true, shape: 'circle', color: 'yellow' },
+            { text: 'Y', isCorrect: false, shape: 'square', color: 'green' },
+          ],
+        },
+      ],
+    };
+
+    await request('PUT', `/api/quizzes/${quizId}`, update);
+
+    const { data: getResult } = await request('GET', `/api/quizzes/${quizId}`);
+    const quiz = getResult as Record<string, unknown>;
+
+    if (quiz.source !== 'ai_generated') throw new Error('Source should be preserved');
+    if (quiz.aiTopic !== 'History') throw new Error('aiTopic should be preserved');
+    if (quiz.title !== 'Updated AI Quiz') throw new Error('Title should be updated');
+
+    await request('DELETE', `/api/quizzes/${quizId}`, undefined, 204);
+  });
+
+  await test('PUT /api/quizzes/:id on another users quiz returns 404', async () => {
+    const quiz = {
+      title: 'User isolation test',
+      questions: [
+        {
+          text: 'Q?',
+          options: [
+            { text: 'A', isCorrect: true, shape: 'triangle', color: 'red' },
+            { text: 'B', isCorrect: false, shape: 'diamond', color: 'blue' },
+          ],
+        },
+      ],
+    };
+
+    await request('PUT', '/api/quizzes/non-existent-user-quiz-id', quiz, 404);
+  });
+
+  await test('PUT /api/quizzes/:id with many questions succeeds', async () => {
+    const validQuiz = {
+      title: 'Quiz for PUT many questions test',
+      source: 'manual',
+      questions: [
+        {
+          text: 'Original?',
+          options: [
+            { text: 'A', isCorrect: true, shape: 'triangle', color: 'red' },
+            { text: 'B', isCorrect: false, shape: 'diamond', color: 'blue' },
+          ],
+        },
+      ],
+    };
+
+    const { data } = await request('POST', '/api/quizzes', validQuiz, 201);
+    const quizId = (data as { id: string }).id;
+
+    const manyQuestions = Array.from({ length: 30 }, (_, i) => ({
+      text: `Updated question ${i + 1}?`,
+      timeLimit: 15,
+      options: [
+        { text: `A${i}`, isCorrect: true, shape: 'triangle', color: 'red' },
+        { text: `B${i}`, isCorrect: false, shape: 'diamond', color: 'blue' },
+      ],
+    }));
+
+    const update = {
+      title: 'Quiz with 30 questions',
+      questions: manyQuestions,
+    };
+
+    await request('PUT', `/api/quizzes/${quizId}`, update);
+
+    const { data: getResult } = await request('GET', `/api/quizzes/${quizId}`);
+    const quiz = getResult as { questions: unknown[] };
+    if (quiz.questions.length !== 30) {
+      throw new Error(`Expected 30 questions, got ${quiz.questions.length}`);
+    }
+
+    await request('DELETE', `/api/quizzes/${quizId}`, undefined, 204);
+  });
+
+  await test('PUT /api/quizzes/:id preserves reason fields in options', async () => {
+    const validQuiz = {
+      title: 'Quiz for PUT reason test',
+      source: 'manual',
+      questions: [
+        {
+          text: 'Original?',
+          options: [
+            { text: 'A', isCorrect: true, shape: 'triangle', color: 'red' },
+            { text: 'B', isCorrect: false, shape: 'diamond', color: 'blue' },
+          ],
+        },
+      ],
+    };
+
+    const { data } = await request('POST', '/api/quizzes', validQuiz, 201);
+    const quizId = (data as { id: string }).id;
+
+    const updateWithReasons = {
+      title: 'Quiz with reasons',
+      questions: [
+        {
+          text: 'Why is the sky blue?',
+          options: [
+            { text: 'Rayleigh scattering', isCorrect: true, shape: 'triangle', color: 'red', reason: 'Light scatters in atmosphere' },
+            { text: 'Paint', isCorrect: false, shape: 'diamond', color: 'blue', reason: 'That is not how it works' },
+          ],
+        },
+      ],
+    };
+
+    await request('PUT', `/api/quizzes/${quizId}`, updateWithReasons);
+
+    const { data: getResult } = await request('GET', `/api/quizzes/${quizId}`);
+    const quiz = getResult as { questions: { options: { reason?: string }[] }[] };
+
+    const correctOpt = quiz.questions[0].options.find((o: any) => o.isCorrect);
+    if (correctOpt?.reason !== 'Light scatters in atmosphere') {
+      throw new Error('Reason not preserved on update');
+    }
+
+    await request('DELETE', `/api/quizzes/${quizId}`, undefined, 204);
+  });
+
   console.log('\nPhase 6 - Duplicate/Idempotency Tests:');
 
   await test('POST /api/quizzes with same data creates separate quizzes', async () => {
diff --git a/tests/components/SaveOptionsModal.test.tsx b/tests/components/SaveOptionsModal.test.tsx
new file mode 100644
index 0000000..079559a
--- /dev/null
+++ b/tests/components/SaveOptionsModal.test.tsx
@@ -0,0 +1,200 @@
+import React from 'react';
+import { render, screen, fireEvent } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { SaveOptionsModal } from '../../components/SaveOptionsModal';
+
+describe('SaveOptionsModal', () => {
+  const defaultProps = {
+    isOpen: true,
+    onClose: vi.fn(),
+    onSaveNew: vi.fn(),
+    onOverwrite: vi.fn(),
+    isSaving: false,
+  };
+
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  describe('rendering', () => {
+    it('renders nothing when isOpen is false', () => {
+      render(<SaveOptionsModal {...defaultProps} isOpen={false} />);
+      expect(screen.queryByText('Save Quiz')).not.toBeInTheDocument();
+    });
+
+    it('renders modal when isOpen is true', () => {
+      render(<SaveOptionsModal {...defaultProps} />);
+      expect(screen.getByText('Save Quiz')).toBeInTheDocument();
+    });
+
+    it('displays explanation text', () => {
+      render(<SaveOptionsModal {...defaultProps} />);
+      expect(screen.getByText(/loaded from your library/i)).toBeInTheDocument();
+    });
+
+    it('shows update existing button', () => {
+      render(<SaveOptionsModal {...defaultProps} />);
+      expect(screen.getByText('Update existing quiz')).toBeInTheDocument();
+    });
+
+    it('shows save as new button', () => {
+      render(<SaveOptionsModal {...defaultProps} />);
+      expect(screen.getByText('Save as new quiz')).toBeInTheDocument();
+    });
+
+    it('shows close button', () => {
+      render(<SaveOptionsModal {...defaultProps} />);
+      const closeButtons = screen.getAllByRole('button');
+      expect(closeButtons.length).toBeGreaterThanOrEqual(3);
+    });
+  });
+
+  describe('interactions - happy path', () => {
+    it('calls onOverwrite when update existing is clicked', async () => {
+      const user = userEvent.setup();
+      render(<SaveOptionsModal {...defaultProps} />);
+      
+      await user.click(screen.getByText('Update existing quiz'));
+      
+      expect(defaultProps.onOverwrite).toHaveBeenCalledTimes(1);
+    });
+
+    it('calls onSaveNew when save as new is clicked', async () => {
+      const user = userEvent.setup();
+      render(<SaveOptionsModal {...defaultProps} />);
+      
+      await user.click(screen.getByText('Save as new quiz'));
+      
+      expect(defaultProps.onSaveNew).toHaveBeenCalledTimes(1);
+    });
+
+    it('calls onClose when close button (X) is clicked', async () => {
+      const user = userEvent.setup();
+      render(<SaveOptionsModal {...defaultProps} />);
+      
+      const closeButton = screen.getByRole('button', { name: '' });
+      await user.click(closeButton);
+      
+      expect(defaultProps.onClose).toHaveBeenCalledTimes(1);
+    });
+
+    it('calls onClose when backdrop is clicked', async () => {
+      render(<SaveOptionsModal {...defaultProps} />);
+      
+      const backdrop = document.querySelector('.fixed.inset-0');
+      expect(backdrop).toBeInTheDocument();
+      fireEvent.click(backdrop!);
+      
+      expect(defaultProps.onClose).toHaveBeenCalled();
+    });
+
+    it('does not close when modal content is clicked', async () => {
+      const user = userEvent.setup();
+      render(<SaveOptionsModal {...defaultProps} />);
+      
+      await user.click(screen.getByText('Save Quiz'));
+      
+      expect(defaultProps.onClose).not.toHaveBeenCalled();
+    });
+  });
+
+  describe('interactions - unhappy path / edge cases', () => {
+    it('disables buttons when isSaving is true', () => {
+      render(<SaveOptionsModal {...defaultProps} isSaving={true} />);
+      
+      const updateButton = screen.getByText('Update existing quiz').closest('button');
+      const saveNewButton = screen.getByText('Save as new quiz').closest('button');
+      
+      expect(updateButton).toBeDisabled();
+      expect(saveNewButton).toBeDisabled();
+    });
+
+    it('does not call onOverwrite when disabled and clicked', async () => {
+      const user = userEvent.setup();
+      render(<SaveOptionsModal {...defaultProps} isSaving={true} />);
+      
+      const button = screen.getByText('Update existing quiz').closest('button')!;
+      await user.click(button);
+      
+      expect(defaultProps.onOverwrite).not.toHaveBeenCalled();
+    });
+
+    it('does not call onSaveNew when disabled and clicked', async () => {
+      const user = userEvent.setup();
+      render(<SaveOptionsModal {...defaultProps} isSaving={true} />);
+      
+      const button = screen.getByText('Save as new quiz').closest('button')!;
+      await user.click(button);
+      
+      expect(defaultProps.onSaveNew).not.toHaveBeenCalled();
+    });
+
+    it('handles rapid clicks gracefully', async () => {
+      const user = userEvent.setup();
+      render(<SaveOptionsModal {...defaultProps} />);
+      
+      const button = screen.getByText('Update existing quiz');
+      await user.click(button);
+      await user.click(button);
+      await user.click(button);
+      
+      expect(defaultProps.onOverwrite).toHaveBeenCalledTimes(3);
+    });
+
+    it('remains functional after re-opening', async () => {
+      const user = userEvent.setup();
+      const { rerender } = render(<SaveOptionsModal {...defaultProps} />);
+      
+      await user.click(screen.getByText('Update existing quiz'));
+      expect(defaultProps.onOverwrite).toHaveBeenCalledTimes(1);
+      
+      rerender(<SaveOptionsModal {...defaultProps} isOpen={false} />);
+      expect(screen.queryByText('Save Quiz')).not.toBeInTheDocument();
+      
+      rerender(<SaveOptionsModal {...defaultProps} isOpen={true} />);
+      await user.click(screen.getByText('Save as new quiz'));
+      expect(defaultProps.onSaveNew).toHaveBeenCalledTimes(1);
+    });
+  });
+
+  describe('accessibility', () => {
+    it('all interactive elements are focusable', () => {
+      render(<SaveOptionsModal {...defaultProps} />);
+      
+      const buttons = screen.getAllByRole('button');
+      buttons.forEach(button => {
+        expect(button).not.toHaveAttribute('tabindex', '-1');
+      });
+    });
+
+    it('buttons have descriptive text for screen readers', () => {
+      render(<SaveOptionsModal {...defaultProps} />);
+      
+      expect(screen.getByText('Overwrite the original with your changes')).toBeInTheDocument();
+      expect(screen.getByText('Keep the original and create a copy')).toBeInTheDocument();
+    });
+  });
+
+  describe('state transitions', () => {
+    it('transitions from not saving to saving correctly', async () => {
+      const { rerender } = render(<SaveOptionsModal {...defaultProps} isSaving={false} />);
+      
+      const updateButton = screen.getByText('Update existing quiz').closest('button');
+      expect(updateButton).not.toBeDisabled();
+      
+      rerender(<SaveOptionsModal {...defaultProps} isSaving={true} />);
+      expect(updateButton).toBeDisabled();
+    });
+
+    it('transitions from saving back to not saving', async () => {
+      const { rerender } = render(<SaveOptionsModal {...defaultProps} isSaving={true} />);
+      
+      const updateButton = screen.getByText('Update existing quiz').closest('button');
+      expect(updateButton).toBeDisabled();
+      
+      rerender(<SaveOptionsModal {...defaultProps} isSaving={false} />);
+      expect(updateButton).not.toBeDisabled();
+    });
+  });
+});
diff --git a/tests/hooks/useQuizLibrary.test.tsx b/tests/hooks/useQuizLibrary.test.tsx
new file mode 100644
index 0000000..ec55ef3
--- /dev/null
+++ b/tests/hooks/useQuizLibrary.test.tsx
@@ -0,0 +1,353 @@
+import React from 'react';
+import { renderHook, act, waitFor } from '@testing-library/react';
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
+import { useQuizLibrary } from '../../hooks/useQuizLibrary';
+import type { Quiz } from '../../types';
+
+const mockAuthFetch = vi.fn();
+const mockIsAuthenticated = vi.fn(() => true);
+
+vi.mock('../../hooks/useAuthenticatedFetch', () => ({
+  useAuthenticatedFetch: () => ({
+    authFetch: mockAuthFetch,
+    isAuthenticated: mockIsAuthenticated(),
+  }),
+}));
+
+vi.mock('react-hot-toast', () => ({
+  default: {
+    success: vi.fn(),
+    error: vi.fn(),
+  },
+}));
+
+const createMockQuiz = (overrides?: Partial<Quiz>): Quiz => ({
+  title: 'Test Quiz',
+  questions: [
+    {
+      id: 'q1',
+      text: 'What is 2+2?',
+      timeLimit: 20,
+      options: [
+        { text: '3', isCorrect: false, shape: 'triangle', color: 'red' },
+        { text: '4', isCorrect: true, shape: 'diamond', color: 'blue' },
+        { text: '5', isCorrect: false, shape: 'circle', color: 'yellow' },
+        { text: '6', isCorrect: false, shape: 'square', color: 'green' },
+      ],
+    },
+  ],
+  ...overrides,
+});
+
+describe('useQuizLibrary - updateQuiz', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    mockIsAuthenticated.mockReturnValue(true);
+  });
+
+  afterEach(() => {
+    vi.resetAllMocks();
+  });
+
+  describe('happy path', () => {
+    it('successfully updates a quiz', async () => {
+      mockAuthFetch.mockResolvedValueOnce({
+        ok: true,
+        json: () => Promise.resolve({ id: 'quiz-123' }),
+      });
+
+      const { result } = renderHook(() => useQuizLibrary());
+      const quiz = createMockQuiz({ title: 'Updated Quiz' });
+
+      await act(async () => {
+        await result.current.updateQuiz('quiz-123', quiz);
+      });
+
+      expect(mockAuthFetch).toHaveBeenCalledWith('/api/quizzes/quiz-123', {
+        method: 'PUT',
+        body: expect.stringContaining('Updated Quiz'),
+      });
+      expect(result.current.saving).toBe(false);
+    });
+
+    it('sets saving to true during update', async () => {
+      let resolvePromise: (value: unknown) => void;
+      const pendingPromise = new Promise((resolve) => {
+        resolvePromise = resolve;
+      });
+      mockAuthFetch.mockReturnValueOnce(pendingPromise);
+
+      const { result } = renderHook(() => useQuizLibrary());
+      const quiz = createMockQuiz();
+
+      act(() => {
+        result.current.updateQuiz('quiz-123', quiz);
+      });
+
+      await waitFor(() => {
+        expect(result.current.saving).toBe(true);
+      });
+
+      await act(async () => {
+        resolvePromise!({ ok: true, json: () => Promise.resolve({}) });
+      });
+
+      await waitFor(() => {
+        expect(result.current.saving).toBe(false);
+      });
+    });
+
+    it('sends correct request body structure', async () => {
+      mockAuthFetch.mockResolvedValueOnce({
+        ok: true,
+        json: () => Promise.resolve({}),
+      });
+
+      const { result } = renderHook(() => useQuizLibrary());
+      const quiz = createMockQuiz({
+        title: 'My Quiz',
+        questions: [
+          {
+            id: 'q1',
+            text: 'Question 1',
+            timeLimit: 30,
+            options: [
+              { text: 'A', isCorrect: true, shape: 'triangle', color: 'red', reason: 'Correct!' },
+              { text: 'B', isCorrect: false, shape: 'diamond', color: 'blue' },
+            ],
+          },
+        ],
+      });
+
+      await act(async () => {
+        await result.current.updateQuiz('quiz-456', quiz);
+      });
+
+      const [, options] = mockAuthFetch.mock.calls[0];
+      const body = JSON.parse(options.body);
+
+      expect(body.title).toBe('My Quiz');
+      expect(body.questions).toHaveLength(1);
+      expect(body.questions[0].text).toBe('Question 1');
+      expect(body.questions[0].timeLimit).toBe(30);
+      expect(body.questions[0].options[0].reason).toBe('Correct!');
+    });
+
+    it('handles quiz with multiple questions', async () => {
+      mockAuthFetch.mockResolvedValueOnce({
+        ok: true,
+        json: () => Promise.resolve({}),
+      });
+
+      const { result } = renderHook(() => useQuizLibrary());
+      const quiz = createMockQuiz({
+        questions: [
+          {
+            id: 'q1',
+            text: 'Q1',
+            timeLimit: 20,
+            options: [
+              { text: 'A', isCorrect: true, shape: 'triangle', color: 'red' },
+              { text: 'B', isCorrect: false, shape: 'diamond', color: 'blue' },
+            ],
+          },
+          {
+            id: 'q2',
+            text: 'Q2',
+            timeLimit: 25,
+            options: [
+              { text: 'C', isCorrect: false, shape: 'circle', color: 'yellow' },
+              { text: 'D', isCorrect: true, shape: 'square', color: 'green' },
+            ],
+          },
+        ],
+      });
+
+      await act(async () => {
+        await result.current.updateQuiz('quiz-789', quiz);
+      });
+
+      const [, options] = mockAuthFetch.mock.calls[0];
+      const body = JSON.parse(options.body);
+      expect(body.questions).toHaveLength(2);
+    });
+  });
+
+  describe('unhappy path - API errors', () => {
+    it('handles 404 not found error', async () => {
+      mockAuthFetch.mockResolvedValueOnce({
+        ok: false,
+        status: 404,
+      });
+
+      const { result } = renderHook(() => useQuizLibrary());
+      const quiz = createMockQuiz();
+
+      await expect(
+        act(async () => {
+          await result.current.updateQuiz('non-existent', quiz);
+        })
+      ).rejects.toThrow('Quiz not found');
+
+      expect(result.current.saving).toBe(false);
+    });
+
+    it('handles generic server error', async () => {
+      mockAuthFetch.mockResolvedValueOnce({
+        ok: false,
+        status: 500,
+      });
+
+      const { result } = renderHook(() => useQuizLibrary());
+      const quiz = createMockQuiz();
+
+      await expect(
+        act(async () => {
+          await result.current.updateQuiz('quiz-123', quiz);
+        })
+      ).rejects.toThrow('Failed to update quiz');
+    });
+
+    it('handles network error', async () => {
+      mockAuthFetch.mockRejectedValueOnce(new Error('Network error'));
+
+      const { result } = renderHook(() => useQuizLibrary());
+      const quiz = createMockQuiz();
+
+      await expect(
+        act(async () => {
+          await result.current.updateQuiz('quiz-123', quiz);
+        })
+      ).rejects.toThrow('Network error');
+
+      expect(result.current.saving).toBe(false);
+    });
+
+    it('handles timeout/abort error', async () => {
+      const abortError = new Error('The operation was aborted');
+      abortError.name = 'AbortError';
+      mockAuthFetch.mockRejectedValueOnce(abortError);
+
+      const { result } = renderHook(() => useQuizLibrary());
+      const quiz = createMockQuiz();
+
+      await expect(
+        act(async () => {
+          await result.current.updateQuiz('quiz-123', quiz);
+        })
+      ).rejects.toThrow();
+
+      expect(result.current.saving).toBe(false);
+    });
+  });
+
+  describe('unhappy path - edge cases', () => {
+    it('resets saving state even on error', async () => {
+      mockAuthFetch.mockRejectedValueOnce(new Error('Server error'));
+
+      const { result } = renderHook(() => useQuizLibrary());
+      const quiz = createMockQuiz();
+
+      try {
+        await act(async () => {
+          await result.current.updateQuiz('quiz-123', quiz);
+        });
+      } catch {
+        // Expected to throw
+      }
+
+      expect(result.current.saving).toBe(false);
+    });
+
+    it('handles empty quiz ID', async () => {
+      mockAuthFetch.mockResolvedValueOnce({
+        ok: false,
+        status: 404,
+      });
+
+      const { result } = renderHook(() => useQuizLibrary());
+      const quiz = createMockQuiz();
+
+      await expect(
+        act(async () => {
+          await result.current.updateQuiz('', quiz);
+        })
+      ).rejects.toThrow();
+    });
+
+    it('handles quiz with empty title', async () => {
+      mockAuthFetch.mockResolvedValueOnce({
+        ok: true,
+        json: () => Promise.resolve({}),
+      });
+
+      const { result } = renderHook(() => useQuizLibrary());
+      const quiz = createMockQuiz({ title: '' });
+
+      await act(async () => {
+        await result.current.updateQuiz('quiz-123', quiz);
+      });
+
+      const [, options] = mockAuthFetch.mock.calls[0];
+      const body = JSON.parse(options.body);
+      expect(body.title).toBe('');
+    });
+
+    it('strips undefined reason fields to null', async () => {
+      mockAuthFetch.mockResolvedValueOnce({
+        ok: true,
+        json: () => Promise.resolve({}),
+      });
+
+      const { result } = renderHook(() => useQuizLibrary());
+      const quiz = createMockQuiz({
+        questions: [
+          {
+            id: 'q1',
+            text: 'Q',
+            timeLimit: 20,
+            options: [
+              { text: 'A', isCorrect: true, shape: 'triangle', color: 'red', reason: undefined },
+              { text: 'B', isCorrect: false, shape: 'diamond', color: 'blue' },
+            ],
+          },
+        ],
+      });
+
+      await act(async () => {
+        await result.current.updateQuiz('quiz-123', quiz);
+      });
+
+      const [, options] = mockAuthFetch.mock.calls[0];
+      const body = JSON.parse(options.body);
+      expect(body.questions[0].options[0]).not.toHaveProperty('reason');
+    });
+  });
+
+  describe('concurrent operations', () => {
+    it('allows update after save completes', async () => {
+      mockAuthFetch
+        .mockResolvedValueOnce({
+          ok: true,
+          json: () => Promise.resolve({ id: 'new-quiz' }),
+        })
+        .mockResolvedValueOnce({
+          ok: true,
+          json: () => Promise.resolve({}),
+        });
+
+      const { result } = renderHook(() => useQuizLibrary());
+      const quiz = createMockQuiz();
+
+      await act(async () => {
+        await result.current.saveQuiz(quiz, 'manual');
+      });
+
+      await act(async () => {
+        await result.current.updateQuiz('new-quiz', { ...quiz, title: 'Updated' });
+      });
+
+      expect(mockAuthFetch).toHaveBeenCalledTimes(2);
+    });
+  });
+});
diff --git a/tests/setup.tsx b/tests/setup.tsx
new file mode 100644
index 0000000..bf5ea33
--- /dev/null
+++ b/tests/setup.tsx
@@ -0,0 +1,20 @@
+import React from 'react';
+import '@testing-library/jest-dom/vitest';
+import { cleanup } from '@testing-library/react';
+import { afterEach, vi } from 'vitest';
+
+afterEach(() => {
+  cleanup();
+});
+
+vi.mock('framer-motion', async () => {
+  const actual = await vi.importActual('framer-motion');
+  return {
+    ...actual,
+    motion: {
+      div: ({ children, ...props }: React.HTMLAttributes<HTMLDivElement>) => <div {...props}>{children}</div>,
+      button: ({ children, ...props }: React.ButtonHTMLAttributes<HTMLButtonElement>) => <button {...props}>{children}</button>,
+    },
+    AnimatePresence: ({ children }: { children: React.ReactNode }) => <>{children}</>,
+  };
+});
diff --git a/tsconfig.json b/tsconfig.json
index 21643e7..115a286 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -12,7 +12,8 @@
     "skipLibCheck": true,
     "types": [
       "node",
-      "vite/client"
+      "vite/client",
+      "vitest/globals"
     ],
     "moduleResolution": "bundler",
     "isolatedModules": true,
diff --git a/vite.config.ts b/vite.config.ts
index 8738b76..af3544b 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -18,6 +18,17 @@ export default defineConfig(({ mode }) => {
         alias: {
           '@': path.resolve(__dirname, '.'),
         }
-      }
+      },
+      test: {
+        globals: true,
+        environment: 'jsdom',
+        setupFiles: ['./tests/setup.tsx'],
+        include: ['tests/**/*.test.{ts,tsx}'],
+        coverage: {
+          provider: 'v8',
+          reporter: ['text', 'json', 'html'],
+          include: ['components/**', 'hooks/**'],
+        },
+      },
     };
 });