Add tests and edit works

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,