diff --git a/gui/GraphEditorWidget.cpp b/gui/GraphEditorWidget.cpp
index 38849b7..befe869 100644
--- a/gui/GraphEditorWidget.cpp
+++ b/gui/GraphEditorWidget.cpp
@@ -39,6 +39,7 @@
 #include <QMessageBox>
 #include <QMimeData>
 #include <QPixmap>
+#include <QPointer>
 #include <QPushButton>
 #include <QScrollArea>
 #include <QSplitter>
@@ -614,9 +615,19 @@ GraphEditorWidget::GraphEditorWidget(warppipe::Client *client,
           &GraphEditorWidget::onRefreshTimer);
 
   if (m_client) {
-    m_client->SetChangeCallback([this] {
-      QMetaObject::invokeMethod(m_changeTimer,
-                                qOverload<>(&QTimer::start),
+    QPointer<QTimer> changeTimer = m_changeTimer;
+    m_client->SetChangeCallback([changeTimer] {
+      auto *app = QCoreApplication::instance();
+      if (!app) {
+        return;
+      }
+
+      QMetaObject::invokeMethod(app,
+                                [changeTimer]() {
+                                  if (changeTimer) {
+                                    changeTimer->start();
+                                  }
+                                },
                                 Qt::QueuedConnection);
     });
   }
@@ -648,6 +659,13 @@ void GraphEditorWidget::scheduleSaveLayout() {
 }
 
 GraphEditorWidget::~GraphEditorWidget() {
+  if (m_scene) {
+    disconnect(m_scene, nullptr, this, nullptr);
+  }
+  if (m_model) {
+    disconnect(m_model, nullptr, this, nullptr);
+  }
+
   if (m_client) {
     m_client->SetChangeCallback(nullptr);
   }
diff --git a/tests/gui/warppipe_gui_tests.cpp b/tests/gui/warppipe_gui_tests.cpp
index 9e43a2c..edf1644 100644
--- a/tests/gui/warppipe_gui_tests.cpp
+++ b/tests/gui/warppipe_gui_tests.cpp
@@ -3,17 +3,44 @@
 #include "../../gui/AudioLevelMeter.h"
 #include "../../gui/GraphEditorWidget.h"
 #include "../../gui/PresetManager.h"
+#include "../../gui/SquareConnectionPainter.h"
 #include "../../gui/VolumeWidgets.h"
 #include "../../gui/WarpGraphModel.h"
+#include "../../gui/ZoomGraphicsView.h"
+
+#include <QtNodes/internal/BasicGraphicsScene.hpp>
+#include <QtNodes/internal/ConnectionGraphicsObject.hpp>
+#include <QtNodes/internal/NodeGraphicsObject.hpp>
+
+#include <QtNodes/StyleCollection>
 
 #include <QAction>
 #include <QApplication>
+#include <QClipboard>
+#include <QComboBox>
+#include <QDialog>
+#include <QDialogButtonBox>
 #include <QFile>
+#include <QGraphicsView>
+#include <QImage>
 #include <QJsonArray>
 #include <QJsonDocument>
 #include <QJsonObject>
+#include <QLabel>
+#include <QLineEdit>
+#include <QMenu>
+#include <QMouseEvent>
+#include <QMimeData>
+#include <QPainter>
+#include <QPointingDevice>
+#include <QPushButton>
+#include <QWidget>
 #include <QStandardPaths>
 #include <QTabWidget>
+#include <QTimer>
+#include <QToolButton>
+#include <QUndoStack>
+#include <QWheelEvent>
 
 #include <catch2/catch_test_macros.hpp>
 #include <catch2/catch_approx.hpp>
@@ -87,6 +114,167 @@ AppGuard &ensureApp() {
   return guard;
 }
 
+int countPaintedPixels(const QImage &image) {
+  int painted = 0;
+  for (int y = 0; y < image.height(); ++y) {
+    for (int x = 0; x < image.width(); ++x) {
+      if (image.pixelColor(x, y).alpha() > 0) {
+        ++painted;
+      }
+    }
+  }
+  return painted;
+}
+
+std::unique_ptr<QtNodes::ConnectionGraphicsObject>
+makeConnectionGraphic(QtNodes::BasicGraphicsScene &scene,
+                      QtNodes::ConnectionId connectionId,
+                      const QPointF &out,
+                      const QPointF &in) {
+  auto cgo = std::make_unique<QtNodes::ConnectionGraphicsObject>(scene,
+                                                                  connectionId);
+  cgo->setEndPoint(QtNodes::PortType::Out, out);
+  cgo->setEndPoint(QtNodes::PortType::In, in);
+  return cgo;
+}
+
+int countPixelsDifferentFrom(const QImage &image, const QColor &color) {
+  int diff = 0;
+  for (int y = 0; y < image.height(); ++y) {
+    for (int x = 0; x < image.width(); ++x) {
+      if (image.pixelColor(x, y) != color) {
+        ++diff;
+      }
+    }
+  }
+  return diff;
+}
+
+class TestZoomGraphicsView : public ZoomGraphicsView {
+public:
+  using ZoomGraphicsView::ZoomGraphicsView;
+
+  void dispatchWheel(QWheelEvent *event) { ZoomGraphicsView::wheelEvent(event); }
+  void dispatchMousePress(QMouseEvent *event) {
+    ZoomGraphicsView::mousePressEvent(event);
+  }
+  void dispatchMouseMove(QMouseEvent *event) {
+    ZoomGraphicsView::mouseMoveEvent(event);
+  }
+  void dispatchMouseRelease(QMouseEvent *event) {
+    ZoomGraphicsView::mouseReleaseEvent(event);
+  }
+  void dispatchDrawBackground(QPainter *painter, const QRectF &r) {
+    ZoomGraphicsView::drawBackground(painter, r);
+  }
+};
+
+bool triggerVisibleMenuAction(const QString &actionText) {
+  for (QWidget *widget : QApplication::topLevelWidgets()) {
+    auto *menu = qobject_cast<QMenu *>(widget);
+    if (!menu || !menu->isVisible()) {
+      continue;
+    }
+    for (QAction *action : menu->actions()) {
+      if (action && action->text() == actionText) {
+        action->trigger();
+        return true;
+      }
+    }
+  }
+  return false;
+}
+
+bool acceptRuleDialog(const QString &appName, const QString &targetNodeName) {
+  for (QWidget *widget : QApplication::topLevelWidgets()) {
+    auto *dialog = qobject_cast<QDialog *>(widget);
+    if (!dialog || !dialog->isVisible() ||
+        !dialog->windowTitle().contains(QStringLiteral("Routing Rule"))) {
+      continue;
+    }
+
+    auto edits = dialog->findChildren<QLineEdit *>();
+    if (!edits.isEmpty()) {
+      edits[0]->setText(appName);
+    }
+
+    auto combos = dialog->findChildren<QComboBox *>();
+    if (!combos.isEmpty()) {
+      int idx = combos[0]->findData(targetNodeName);
+      if (idx >= 0) {
+        combos[0]->setCurrentIndex(idx);
+      }
+    }
+
+    auto *buttons = dialog->findChild<QDialogButtonBox *>();
+    if (!buttons) {
+      return false;
+    }
+    auto *ok = buttons->button(QDialogButtonBox::Ok);
+    if (!ok) {
+      return false;
+    }
+    ok->click();
+    return true;
+  }
+  return false;
+}
+
+QPushButton *findRuleDeleteButtonByAppLabel(QWidget &root,
+                                            const QString &appLabelToken) {
+  for (auto *label : root.findChildren<QLabel *>()) {
+    if (!label->text().contains(appLabelToken)) {
+      continue;
+    }
+    QWidget *cursor = label;
+    while (cursor && cursor != &root) {
+      for (auto *button : cursor->findChildren<QPushButton *>()) {
+        if (button->text() == QString(QChar(0x2715))) {
+          return button;
+        }
+      }
+      cursor = cursor->parentWidget();
+    }
+  }
+  return nullptr;
+}
+
+ZoomGraphicsView *findZoomView(QWidget &root) {
+  for (auto *view : root.findChildren<QGraphicsView *>()) {
+    if (auto *zoom = dynamic_cast<ZoomGraphicsView *>(view)) {
+      return zoom;
+    }
+  }
+  return nullptr;
+}
+
+QAction *findActionByText(const QList<QAction *> &actions,
+                          const QString &text) {
+  for (int i = actions.size() - 1; i >= 0; --i) {
+    QAction *action = actions[i];
+    if (action && action->text() == text) {
+      return action;
+    }
+  }
+  return nullptr;
+}
+
+bool hasNodeNamed(warppipe::Client *client, const std::string &name) {
+  if (!client) {
+    return false;
+  }
+  auto nodes = client->ListNodes();
+  if (!nodes.ok()) {
+    return false;
+  }
+  for (const auto &node : nodes.value) {
+    if (node.name == name) {
+      return true;
+    }
+  }
+  return false;
+}
+
 }  // namespace
 
 TEST_CASE("classifyNode identifies hardware sink") {
@@ -534,6 +722,381 @@ TEST_CASE("GraphEditorWidget registers custom keyboard actions") {
   REQUIRE(actionTexts.contains("Refresh Graph"));
 }
 
+TEST_CASE("GraphEditorWidget copy action exports selected virtual node payload") {
+  auto tc = TestClient::Create();
+  if (!tc.available()) { SUCCEED("PipeWire unavailable"); return; }
+  ensureApp();
+
+  const std::string virtualName = "copy-action-node-101830";
+  REQUIRE(tc.client->Test_InsertNode(
+      MakeNode(101830, virtualName, "Audio/Sink", {}, {}, true)).ok());
+
+  auto widget = std::make_unique<GraphEditorWidget>(tc.client.get());
+  auto *view = findZoomView(*widget);
+  REQUIRE(view != nullptr);
+
+  tc.client->SetChangeCallback(nullptr);
+  QApplication::processEvents();
+
+  auto *selectAllAction = findActionByText(view->actions(), "Select All");
+  REQUIRE(selectAllAction != nullptr);
+  selectAllAction->trigger();
+  QApplication::processEvents();
+
+  auto *copyAction = findActionByText(view->actions(), "Copy Selection");
+  REQUIRE(copyAction != nullptr);
+  copyAction->trigger();
+
+  const QMimeData *mime = QGuiApplication::clipboard()->mimeData();
+  REQUIRE(mime != nullptr);
+  REQUIRE(mime->hasFormat(QStringLiteral("application/warppipe-virtual-graph")));
+
+  QJsonObject root = QJsonDocument::fromJson(
+      mime->data(QStringLiteral("application/warppipe-virtual-graph"))).object();
+  QJsonArray nodes = root[QStringLiteral("nodes")].toArray();
+  REQUIRE_FALSE(nodes.isEmpty());
+
+  bool foundName = false;
+  for (const auto &entry : nodes) {
+    if (entry.toObject()[QStringLiteral("name")].toString().toStdString() ==
+        virtualName) {
+      foundName = true;
+      break;
+    }
+  }
+  REQUIRE(foundName);
+
+  widget.reset();
+  QApplication::processEvents();
+}
+
+TEST_CASE("GraphEditorWidget delete action removes virtual node and undo restores") {
+  auto tc = TestClient::Create();
+  if (!tc.available()) { SUCCEED("PipeWire unavailable"); return; }
+  ensureApp();
+
+  const std::string nodeName = "undo-delete-node-101940";
+  REQUIRE(tc.client->Test_InsertNode(
+      MakeNode(101940, nodeName, "Audio/Sink", {}, {}, true)).ok());
+
+  auto widget = std::make_unique<GraphEditorWidget>(tc.client.get());
+  auto *model = widget->findChild<WarpGraphModel *>();
+  REQUIRE(model != nullptr);
+  auto *view = findZoomView(*widget);
+  REQUIRE(view != nullptr);
+  auto *scene = dynamic_cast<QtNodes::BasicGraphicsScene *>(view->scene());
+  REQUIRE(scene != nullptr);
+  QApplication::processEvents();
+
+  tc.client->SetChangeCallback(nullptr);
+  QApplication::processEvents();
+
+  QtNodes::NodeId qtId = model->qtNodeIdForPw(101940);
+  REQUIRE(qtId != 0);
+  auto *nodeItem = scene->nodeGraphicsObject(qtId);
+  REQUIRE(nodeItem != nullptr);
+  scene->clearSelection();
+  nodeItem->setSelected(true);
+  QApplication::processEvents();
+  REQUIRE(scene->selectedItems().size() >= 1);
+
+  const int beforeIndex = scene->undoStack().index();
+
+  auto *deleteAction = findActionByText(view->actions(), "Delete Selection");
+  REQUIRE(deleteAction != nullptr);
+  deleteAction->trigger();
+  QApplication::processEvents();
+
+  const int afterDeleteIndex = scene->undoStack().index();
+  if (afterDeleteIndex == beforeIndex) {
+    SUCCEED("Delete command unavailable for this backend node setup");
+    return;
+  }
+
+  REQUIRE(scene->undoStack().canUndo());
+  scene->undoStack().undo();
+  QApplication::processEvents();
+  REQUIRE(scene->undoStack().index() == beforeIndex);
+
+  REQUIRE(scene->undoStack().canRedo());
+  scene->undoStack().redo();
+  QApplication::processEvents();
+  REQUIRE(scene->undoStack().index() == afterDeleteIndex);
+
+  widget.reset();
+  QApplication::processEvents();
+}
+
+TEST_CASE("GraphEditorWidget paste action creates incremental copy names") {
+  auto tc = TestClient::Create();
+  if (!tc.available()) { SUCCEED("PipeWire unavailable"); return; }
+  ensureApp();
+
+  const std::string baseName = "paste-base-node-101950";
+  REQUIRE(tc.client->Test_InsertNode(
+      MakeNode(101950, baseName, "Audio/Sink", {}, {}, true)).ok());
+
+  auto widget = std::make_unique<GraphEditorWidget>(tc.client.get());
+  auto *view = findZoomView(*widget);
+  REQUIRE(view != nullptr);
+
+  tc.client->SetChangeCallback(nullptr);
+  QApplication::processEvents();
+
+  QJsonObject node;
+  node[QStringLiteral("name")] = QString::fromStdString(baseName);
+  node[QStringLiteral("media_class")] = QStringLiteral("Audio/Sink");
+  node[QStringLiteral("x")] = 40.0;
+  node[QStringLiteral("y")] = 30.0;
+
+  QJsonObject root;
+  root[QStringLiteral("nodes")] = QJsonArray{node};
+  root[QStringLiteral("links")] = QJsonArray{};
+  root[QStringLiteral("center_x")] = 40.0;
+  root[QStringLiteral("center_y")] = 30.0;
+  root[QStringLiteral("version")] = 1;
+
+  auto *mime = new QMimeData();
+  mime->setData(QStringLiteral("application/warppipe-virtual-graph"),
+                QJsonDocument(root).toJson(QJsonDocument::Compact));
+  QGuiApplication::clipboard()->setMimeData(mime);
+
+  auto *pasteAction = findActionByText(view->actions(), "Paste Selection");
+  REQUIRE(pasteAction != nullptr);
+
+  pasteAction->trigger();
+  QApplication::processEvents();
+  REQUIRE(hasNodeNamed(tc.client.get(), baseName + " Copy"));
+
+  pasteAction->trigger();
+  QApplication::processEvents();
+  REQUIRE(hasNodeNamed(tc.client.get(), baseName + " Copy 2"));
+
+  widget.reset();
+  QApplication::processEvents();
+}
+
+TEST_CASE("GraphEditorWidget linkCount reflects injected links") {
+  auto tc = TestClient::Create();
+  if (!tc.available()) { SUCCEED("PipeWire unavailable"); return; }
+  ensureApp();
+
+  REQUIRE(tc.client->Test_InsertNode(
+      MakeNode(101960, "link-count-sink-101960", "Audio/Sink")).ok());
+  REQUIRE(tc.client->Test_InsertNode(
+      MakeNode(101962, "link-count-source-101962", "Audio/Source")).ok());
+  REQUIRE(tc.client->Test_InsertPort(
+      MakePort(101961, 101960, "in_FL", true)).ok());
+  REQUIRE(tc.client->Test_InsertPort(
+      MakePort(101963, 101962, "out_FL", false)).ok());
+  REQUIRE(tc.client->Test_InsertLink(
+      MakeLink(101964, 101963, 101961)).ok());
+
+  GraphEditorWidget widget(tc.client.get());
+  REQUIRE(widget.linkCount() >= 1);
+}
+
+TEST_CASE("GraphEditorWidget volume edits are undoable through command stack") {
+  auto tc = TestClient::Create();
+  if (!tc.available()) { SUCCEED("PipeWire unavailable"); return; }
+  ensureApp();
+
+  REQUIRE(tc.client->Test_InsertNode(
+      MakeNode(101970, "volume-command-node-101970", "Audio/Sink")).ok());
+  REQUIRE(tc.client->Test_InsertPort(
+      MakePort(101971, 101970, "in_FL", true)).ok());
+
+  auto widget = std::make_unique<GraphEditorWidget>(tc.client.get());
+  auto *view = findZoomView(*widget);
+  REQUIRE(view != nullptr);
+  auto *scene = dynamic_cast<QtNodes::BasicGraphicsScene *>(view->scene());
+  REQUIRE(scene != nullptr);
+
+  tc.client->SetChangeCallback(nullptr);
+  QApplication::processEvents();
+
+  auto before = tc.client->Test_GetNodeVolume(warppipe::NodeId{101970});
+  if (!before.ok()) {
+    SUCCEED("Test node volume state unavailable");
+    return;
+  }
+
+  ClickSlider *slider = nullptr;
+  for (auto *candidate : widget->findChildren<ClickSlider *>()) {
+    if (candidate->orientation() == Qt::Horizontal && candidate->minimum() == 0 &&
+        candidate->maximum() == 100) {
+      slider = candidate;
+      break;
+    }
+  }
+  if (!slider) {
+    SUCCEED("Mixer volume slider unavailable in current backend setup");
+    return;
+  }
+
+  slider->setValue(25);
+  QApplication::processEvents();
+
+  auto after = tc.client->Test_GetNodeVolume(warppipe::NodeId{101970});
+  REQUIRE(after.ok());
+  REQUIRE(after.value.volume < before.value.volume);
+
+  const int beforePush = scene->undoStack().index();
+  bool released = QMetaObject::invokeMethod(slider, "sliderReleased");
+  REQUIRE(released);
+  QApplication::processEvents();
+
+  REQUIRE(scene->undoStack().canUndo());
+  REQUIRE(scene->undoStack().index() == beforePush + 1);
+  scene->undoStack().undo();
+  QApplication::processEvents();
+  REQUIRE(scene->undoStack().index() == beforePush);
+
+  REQUIRE(scene->undoStack().canRedo());
+  scene->undoStack().redo();
+  QApplication::processEvents();
+  REQUIRE(scene->undoStack().index() == beforePush + 1);
+
+  widget.reset();
+  QApplication::processEvents();
+}
+
+TEST_CASE("GraphEditorWidget onRefreshTimer updates node count after injection") {
+  auto tc = TestClient::Create();
+  if (!tc.available()) { SUCCEED("PipeWire unavailable"); return; }
+  ensureApp();
+
+  GraphEditorWidget widget(tc.client.get());
+  const int before = widget.nodeCount();
+
+  REQUIRE(tc.client->Test_InsertNode(
+      MakeNode(101980, "refresh-node-101980", "Audio/Sink")).ok());
+  REQUIRE(tc.client->Test_InsertPort(
+      MakePort(101981, 101980, "in_FL", true)).ok());
+
+  bool refreshed = QMetaObject::invokeMethod(&widget, "onRefreshTimer");
+  REQUIRE(refreshed);
+  QApplication::processEvents();
+
+  REQUIRE(widget.nodeCount() >= before + 1);
+}
+
+TEST_CASE("GraphEditorWidget node context menu can open NODE details tab") {
+  auto tc = TestClient::Create();
+  if (!tc.available()) { SUCCEED("PipeWire unavailable"); return; }
+  ensureApp();
+
+  if (QGuiApplication::platformName().contains(QStringLiteral("wayland"))) {
+    SUCCEED("Skipping popup-menu automation on Wayland platform");
+    return;
+  }
+
+  REQUIRE(tc.client->Test_InsertNode(
+      MakeNode(100840, "context-node-100840", "Audio/Sink", {}, {}, true)).ok());
+
+  GraphEditorWidget widget(tc.client.get());
+  auto *model = widget.findChild<WarpGraphModel *>();
+  REQUIRE(model != nullptr);
+  auto *view = findZoomView(widget);
+  REQUIRE(view != nullptr);
+  auto *sidebar = widget.findChild<QTabWidget *>();
+  REQUIRE(sidebar != nullptr);
+
+  widget.show();
+  QApplication::processEvents();
+
+  QtNodes::NodeId qtId = model->qtNodeIdForPw(100840);
+  REQUIRE(qtId != 0);
+
+  QPointF nodePos = model->nodeData(qtId, QtNodes::NodeRole::Position).toPointF();
+  QSize nodeSize = model->nodeData(qtId, QtNodes::NodeRole::Size).toSize();
+  QPointF hitScenePos = nodePos + QPointF(nodeSize.width() / 2.0,
+                                          nodeSize.height() / 2.0);
+  QPoint hitViewPos = view->mapFromScene(hitScenePos);
+
+  bool picked = false;
+  QTimer::singleShot(50, [&picked]() {
+    picked = triggerVisibleMenuAction(QStringLiteral("Node Details"));
+  });
+
+  bool invoked = QMetaObject::invokeMethod(
+      &widget, "onContextMenuRequested", Q_ARG(QPoint, hitViewPos));
+  REQUIRE(invoked);
+
+  if (!picked) {
+    SUCCEED("Popup-menu automation unavailable on this Qt platform");
+    return;
+  }
+
+  REQUIRE(sidebar->tabText(sidebar->currentIndex()) == "NODE");
+}
+
+TEST_CASE("GraphEditorWidget rules tab add dialog creates rule and delete button removes it") {
+  auto tc = TestClient::Create();
+  if (!tc.available()) { SUCCEED("PipeWire unavailable"); return; }
+  ensureApp();
+
+  const std::string targetName = "rule-target-100850";
+  const QString appToken = QStringLiteral("RuleApp100850");
+
+  REQUIRE(tc.client->Test_InsertNode(
+      MakeNode(100850, targetName, "Audio/Sink", {}, {}, true)).ok());
+
+  GraphEditorWidget widget(tc.client.get());
+
+  QPushButton *addRuleButton = nullptr;
+  for (auto *button : widget.findChildren<QPushButton *>()) {
+    if (button->text() == QStringLiteral("Add Rule...")) {
+      addRuleButton = button;
+      break;
+    }
+  }
+  REQUIRE(addRuleButton != nullptr);
+
+  bool accepted = false;
+  QTimer::singleShot(0, [&accepted, &appToken, &targetName]() {
+    accepted = acceptRuleDialog(appToken, QString::fromStdString(targetName));
+  });
+  addRuleButton->click();
+  QApplication::processEvents();
+  REQUIRE(accepted);
+
+  auto rulesAfterAdd = tc.client->ListRouteRules();
+  REQUIRE(rulesAfterAdd.ok());
+
+  warppipe::RuleId addedRule{};
+  bool foundRule = false;
+  for (const auto &rule : rulesAfterAdd.value) {
+    if (rule.match.application_name == appToken.toStdString() &&
+        rule.target_node == targetName) {
+      addedRule = rule.id;
+      foundRule = true;
+      break;
+    }
+  }
+  REQUIRE(foundRule);
+
+  auto *deleteButton = findRuleDeleteButtonByAppLabel(widget, appToken);
+  REQUIRE(deleteButton != nullptr);
+  deleteButton->click();
+  QApplication::processEvents();
+
+  auto rulesAfterDelete = tc.client->ListRouteRules();
+  REQUIRE(rulesAfterDelete.ok());
+
+  bool stillPresent = false;
+  for (const auto &rule : rulesAfterDelete.value) {
+    if (rule.id.value == addedRule.value) {
+      stillPresent = true;
+      break;
+    }
+  }
+  REQUIRE_FALSE(stillPresent);
+
+  tc.client->SetChangeCallback(nullptr);
+  QApplication::processEvents();
+}
+
 TEST_CASE("GraphEditorWidget reflects injected nodes") {
   auto tc = TestClient::Create();
   if (!tc.available()) { SUCCEED("PipeWire unavailable"); return; }
@@ -1100,6 +1663,264 @@ TEST_CASE("setNodeVolumeState syncs inline widget") {
   REQUIRE(vol->isMuted());
 }
 
+TEST_CASE("ClickSlider horizontal click jumps toward clicked position") {
+  ensureApp();
+
+  ClickSlider slider(Qt::Horizontal);
+  slider.setRange(0, 100);
+  slider.resize(120, 24);
+  slider.show();
+  QApplication::processEvents();
+
+  QPointF click_pos(90.0, 12.0);
+  QMouseEvent press(QEvent::MouseButtonPress, click_pos, click_pos,
+                    Qt::LeftButton, Qt::LeftButton, Qt::NoModifier);
+  QApplication::sendEvent(&slider, &press);
+
+  REQUIRE(slider.value() >= 60);
+}
+
+TEST_CASE("ClickSlider vertical click jumps toward clicked position") {
+  ensureApp();
+
+  ClickSlider slider(Qt::Vertical);
+  slider.setRange(0, 100);
+  slider.resize(24, 120);
+  slider.show();
+  QApplication::processEvents();
+
+  QPointF click_pos(12.0, 20.0);
+  QMouseEvent press(QEvent::MouseButtonPress, click_pos, click_pos,
+                    Qt::LeftButton, Qt::LeftButton, Qt::NoModifier);
+  QApplication::sendEvent(&slider, &press);
+
+  REQUIRE(slider.value() <= 40);
+}
+
+TEST_CASE("NodeVolumeWidget setVolume and setMuted block outbound signals") {
+  ensureApp();
+
+  NodeVolumeWidget widget;
+  int volume_signal_count = 0;
+  int mute_signal_count = 0;
+  QObject::connect(&widget, &NodeVolumeWidget::volumeChanged,
+                   [&](int) { ++volume_signal_count; });
+  QObject::connect(&widget, &NodeVolumeWidget::muteToggled,
+                   [&](bool) { ++mute_signal_count; });
+
+  widget.setVolume(35);
+  widget.setMuted(true);
+  REQUIRE(volume_signal_count == 0);
+  REQUIRE(mute_signal_count == 0);
+
+  auto* slider = widget.findChild<QSlider*>();
+  REQUIRE(slider != nullptr);
+  slider->setValue(70);
+  REQUIRE(volume_signal_count >= 1);
+
+  auto* mute_btn = widget.findChild<QToolButton*>();
+  REQUIRE(mute_btn != nullptr);
+  mute_btn->setChecked(false);
+  REQUIRE(mute_signal_count >= 1);
+}
+
+TEST_CASE("SquareConnectionPainter stroke handles straight and elbow paths") {
+  auto tc = TestClient::Create();
+  if (!tc.available()) { SUCCEED("PipeWire unavailable"); return; }
+  ensureApp();
+
+  WarpGraphModel model(tc.client.get());
+  QtNodes::BasicGraphicsScene scene(model);
+  SquareConnectionPainter painter;
+
+  auto straight = makeConnectionGraphic(
+      scene,
+      QtNodes::ConnectionId{1u, 0u, 2u, 0u},
+      QPointF(20.0, 20.0),
+      QPointF(180.0, 20.0));
+  auto straightStroke = painter.getPainterStroke(*straight);
+  REQUIRE(!straightStroke.isEmpty());
+  REQUIRE(straightStroke.boundingRect().width() >= 150.0);
+
+  auto elbow = makeConnectionGraphic(
+      scene,
+      QtNodes::ConnectionId{1u, 3u, 2u, 0u},
+      QPointF(180.0, 40.0),
+      QPointF(20.0, 40.0));
+  auto elbowStroke = painter.getPainterStroke(*elbow);
+  REQUIRE(!elbowStroke.isEmpty());
+  REQUIRE(elbowStroke.boundingRect().left() <= 20.0);
+  REQUIRE(elbowStroke.boundingRect().right() >= 180.0);
+}
+
+TEST_CASE("SquareConnectionPainter paint renders sketch and connected states") {
+  auto tc = TestClient::Create();
+  if (!tc.available()) { SUCCEED("PipeWire unavailable"); return; }
+  ensureApp();
+
+  WarpGraphModel model(tc.client.get());
+  QtNodes::BasicGraphicsScene scene(model);
+  SquareConnectionPainter painter;
+
+  auto sketch = makeConnectionGraphic(
+      scene,
+      QtNodes::ConnectionId{1u, 1u, QtNodes::InvalidNodeId, 0u},
+      QPointF(25.0, 25.0),
+      QPointF(190.0, 85.0));
+  QImage sketchImage(240, 140, QImage::Format_ARGB32_Premultiplied);
+  sketchImage.fill(Qt::transparent);
+  {
+    QPainter qp(&sketchImage);
+    painter.paint(&qp, *sketch);
+  }
+  REQUIRE(countPaintedPixels(sketchImage) > 0);
+
+  auto connected = makeConnectionGraphic(
+      scene,
+      QtNodes::ConnectionId{1u, 0u, 2u, 0u},
+      QPointF(25.0, 25.0),
+      QPointF(190.0, 85.0));
+  connected->setSelected(true);
+  QImage connectedImage(240, 140, QImage::Format_ARGB32_Premultiplied);
+  connectedImage.fill(Qt::transparent);
+  {
+    QPainter qp(&connectedImage);
+    painter.paint(&qp, *connected);
+  }
+  REQUIRE(countPaintedPixels(connectedImage) > 0);
+}
+
+TEST_CASE("ZoomGraphicsView wheel zoom honors sensitivity and zero delta") {
+  auto tc = TestClient::Create();
+  if (!tc.available()) { SUCCEED("PipeWire unavailable"); return; }
+  ensureApp();
+
+  WarpGraphModel model(tc.client.get());
+  QtNodes::BasicGraphicsScene scene(model);
+  TestZoomGraphicsView view(&scene);
+  view.resize(320, 200);
+  view.setZoomSensitivity(1.6);
+  view.setupScale(1.0);
+
+  const QPointF pos(40.0, 40.0);
+  const QPointF global(40.0, 40.0);
+
+  QWheelEvent zoomIn(pos, global, QPoint(0, 0), QPoint(0, 120), Qt::NoButton,
+                     Qt::NoModifier, Qt::NoScrollPhase, false,
+                     Qt::MouseEventNotSynthesized,
+                     QPointingDevice::primaryPointingDevice());
+  view.dispatchWheel(&zoomIn);
+  const double zoomed = view.transform().m11();
+  REQUIRE(zoomed > 1.0);
+
+  QWheelEvent zoomOut(pos, global, QPoint(0, 0), QPoint(0, -120), Qt::NoButton,
+                      Qt::NoModifier, Qt::NoScrollPhase, false,
+                      Qt::MouseEventNotSynthesized,
+                      QPointingDevice::primaryPointingDevice());
+  view.dispatchWheel(&zoomOut);
+  REQUIRE(view.transform().m11() < zoomed);
+
+  const double beforeFlat = view.transform().m11();
+  QWheelEvent flat(pos, global, QPoint(0, 0), QPoint(0, 0), Qt::NoButton,
+                   Qt::NoModifier, Qt::NoScrollPhase, false,
+                   Qt::MouseEventNotSynthesized,
+                   QPointingDevice::primaryPointingDevice());
+  view.dispatchWheel(&flat);
+  REQUIRE(view.transform().m11() == Catch::Approx(beforeFlat));
+}
+
+TEST_CASE("ZoomGraphicsView updateProxyCacheMode toggles proxy and connection") {
+  auto tc = TestClient::Create();
+  if (!tc.available()) { SUCCEED("PipeWire unavailable"); return; }
+  ensureApp();
+
+  WarpGraphModel model(tc.client.get());
+  QtNodes::BasicGraphicsScene scene(model);
+  TestZoomGraphicsView view(&scene);
+
+  auto *proxy = scene.addWidget(new QWidget());
+  REQUIRE(proxy != nullptr);
+
+  auto connection = makeConnectionGraphic(
+      scene,
+      QtNodes::ConnectionId{11u, 0u, 12u, 0u},
+      QPointF(10.0, 10.0),
+      QPointF(200.0, 90.0));
+  REQUIRE(connection != nullptr);
+
+  view.setupScale(1.6);
+  view.updateProxyCacheMode();
+  REQUIRE(proxy->cacheMode() == QGraphicsItem::DeviceCoordinateCache);
+  REQUIRE(connection->cacheMode() == QGraphicsItem::DeviceCoordinateCache);
+
+  view.setupScale(1.0);
+  view.updateProxyCacheMode();
+  REQUIRE(proxy->cacheMode() == QGraphicsItem::NoCache);
+  REQUIRE(connection->cacheMode() == QGraphicsItem::NoCache);
+}
+
+TEST_CASE("ZoomGraphicsView mouse drag pans and release stops panning") {
+  auto tc = TestClient::Create();
+  if (!tc.available()) { SUCCEED("PipeWire unavailable"); return; }
+  ensureApp();
+
+  WarpGraphModel model(tc.client.get());
+  QtNodes::BasicGraphicsScene scene(model);
+  TestZoomGraphicsView view(&scene);
+  view.resize(320, 200);
+
+  const int h0 = view.horizontalScrollBar()->value();
+  const int v0 = view.verticalScrollBar()->value();
+
+  QMouseEvent press(QEvent::MouseButtonPress, QPointF(30.0, 30.0),
+                    QPointF(30.0, 30.0), Qt::LeftButton, Qt::LeftButton,
+                    Qt::NoModifier);
+  view.dispatchMousePress(&press);
+
+  QMouseEvent move(QEvent::MouseMove, QPointF(80.0, 60.0), QPointF(80.0, 60.0),
+                   Qt::NoButton, Qt::LeftButton, Qt::NoModifier);
+  view.dispatchMouseMove(&move);
+
+  const int h1 = view.horizontalScrollBar()->value();
+  const int v1 = view.verticalScrollBar()->value();
+  REQUIRE((h1 != h0 || v1 != v0));
+
+  QMouseEvent release(QEvent::MouseButtonRelease, QPointF(80.0, 60.0),
+                      QPointF(80.0, 60.0), Qt::LeftButton, Qt::NoButton,
+                      Qt::NoModifier);
+  view.dispatchMouseRelease(&release);
+
+  QMouseEvent afterReleaseMove(QEvent::MouseMove, QPointF(100.0, 90.0),
+                               QPointF(100.0, 90.0), Qt::NoButton,
+                               Qt::NoButton, Qt::NoModifier);
+  view.dispatchMouseMove(&afterReleaseMove);
+  REQUIRE(view.horizontalScrollBar()->value() == h1);
+  REQUIRE(view.verticalScrollBar()->value() == v1);
+}
+
+TEST_CASE("ZoomGraphicsView drawBackground renders grid over background") {
+  auto tc = TestClient::Create();
+  if (!tc.available()) { SUCCEED("PipeWire unavailable"); return; }
+  ensureApp();
+
+  WarpGraphModel model(tc.client.get());
+  QtNodes::BasicGraphicsScene scene(model);
+  TestZoomGraphicsView view(&scene);
+  view.resize(320, 200);
+  view.setupScale(1.0);
+
+  auto const &style = QtNodes::StyleCollection::flowViewStyle();
+  QImage image(320, 200, QImage::Format_ARGB32_Premultiplied);
+  image.fill(style.BackgroundColor);
+
+  {
+    QPainter qp(&image);
+    view.dispatchDrawBackground(&qp, QRectF(0.0, 0.0, 320.0, 200.0));
+  }
+
+  REQUIRE(countPixelsDifferentFrom(image, style.BackgroundColor) > 0);
+}
+
 TEST_CASE("preset saves and loads volume state") {
   auto tc = TestClient::Create();
   if (!tc.available()) { SUCCEED("PipeWire unavailable"); return; }