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Add Tests for Copy and Paste Actions in Project Explorer
Implemented a new test class covering copy and paste functionality for resources in the Common Navigator-based Project Explorer. Key tests include: - Verify Copy/Paste/Delete actions exist in context menu for resources - Copy enablement for single resource selection - Copy-to-clipboard verification using ResourceTransfer and TextTransfer - Paste enablement based on clipboard contents and target selection - End-to-end copy-paste round-trip between different projects These tests ensure EditActionGroup and its constituent CopyAction and PasteAction are correctly wired and functional.
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‎tests/org.eclipse.ui.tests.navigator/src/org/eclipse/ui/tests/navigator/CopyPasteActionTest.java‎

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/*******************************************************************************
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* Copyright (c) 2026 vogella GmbH and others.
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*
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* This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License 2.0
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* which accompanies this distribution, and is available at
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* https://www.eclipse.org/legal/epl-2.0/
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*
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* SPDX-License-Identifier: EPL-2.0
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*
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* Contributors:
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* vogella GmbH - initial API and implementation
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*******************************************************************************/
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package org.eclipse.ui.tests.navigator;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertFalse;
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import static org.junit.jupiter.api.Assertions.assertNotNull;
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import static org.junit.jupiter.api.Assertions.assertNull;
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import static org.junit.jupiter.api.Assertions.assertTrue;
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import org.eclipse.core.resources.IFile;
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import org.eclipse.core.resources.IResource;
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import org.eclipse.core.resources.ResourcesPlugin;
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import org.eclipse.core.runtime.CoreException;
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import org.eclipse.jface.action.ActionContributionItem;
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import org.eclipse.jface.viewers.IStructuredSelection;
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import org.eclipse.jface.viewers.StructuredSelection;
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import org.eclipse.swt.dnd.Clipboard;
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import org.eclipse.swt.dnd.TextTransfer;
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import org.eclipse.swt.dnd.Transfer;
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import org.eclipse.swt.widgets.Display;
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import org.eclipse.ui.navigator.resources.ProjectExplorer;
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import org.eclipse.ui.part.ResourceTransfer;
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import org.junit.jupiter.api.AfterEach;
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import org.junit.jupiter.api.Test;
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/**
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* Tests for Copy and Paste actions in the Project Explorer.
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*/
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public class CopyPasteActionTest extends NavigatorTestBase {
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private Clipboard _clipboard;
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public CopyPasteActionTest() {
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_navigatorInstanceId = ProjectExplorer.VIEW_ID;
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}
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@Override
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@AfterEach
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public void tearDown() throws CoreException {
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if (_clipboard != null) {
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_clipboard.dispose();
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_clipboard = null;
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}
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super.tearDown();
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}
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private Clipboard getClipboard() {
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if (_clipboard == null) {
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_clipboard = new Clipboard(Display.getDefault());
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}
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return _clipboard;
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}
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private ActionContributionItem getAction(IStructuredSelection sel, String label) {
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Object item = verifyMenu(sel, label);
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assertNotNull(item, label + " action not found in context menu");
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assertTrue(item instanceof ActionContributionItem, label + " item should be an ActionContributionItem");
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return (ActionContributionItem) item;
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}
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@Test
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public void testCopyEnablement() throws Exception {
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IFile file = _project.getFile("model.properties");
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IStructuredSelection sel = new StructuredSelection(file);
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_viewer.setSelection(sel);
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ActionContributionItem copyActionItem = getAction(sel, "Copy");
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assertTrue(copyActionItem.getAction().isEnabled(), "Copy action should be enabled for a file");
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}
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@Test
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public void testCopyDisabledForMixedSelection() throws Exception {
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// Mixed selection (Project + File) should disable Copy action
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IFile file = _project.getFile("model.properties");
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IStructuredSelection sel = new StructuredSelection(new Object[] { _project, file });
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_viewer.setSelection(sel);
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ActionContributionItem copyActionItem = getAction(sel, "Copy");
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assertFalse(copyActionItem.getAction().isEnabled(), "Copy action should be disabled for mixed selection");
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}
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@Test
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public void testCopyDisabledForEmptySelection() throws Exception {
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IStructuredSelection sel = StructuredSelection.EMPTY;
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_viewer.setSelection(sel);
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Object copyItem = verifyMenu(sel, "Copy");
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// For an empty selection, the Resource action provider is not even matched,
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// so the action should be absent from the menu.
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assertNull(copyItem, "Copy action should be absent for empty selection");
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}
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@Test
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public void testCopyToClipboard() throws Exception {
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IFile file = _project.getFile("model.properties");
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IStructuredSelection sel = new StructuredSelection(file);
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_viewer.setSelection(sel);
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ActionContributionItem copyActionItem = getAction(sel, "Copy");
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copyActionItem.getAction().run();
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Object contents = getClipboard().getContents(ResourceTransfer.getInstance());
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assertNotNull(contents, "Clipboard should contain resources");
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IResource[] resources = (IResource[]) contents;
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assertEquals(1, resources.length);
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assertEquals(file, resources[0]);
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}
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@Test
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public void testCopyTextTransfer() throws Exception {
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IFile file = _project.getFile("model.properties");
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IStructuredSelection sel = new StructuredSelection(file);
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_viewer.setSelection(sel);
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ActionContributionItem copyActionItem = getAction(sel, "Copy");
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copyActionItem.getAction().run();
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String textContents = (String) getClipboard().getContents(TextTransfer.getInstance());
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assertNotNull(textContents, "Clipboard should contain text");
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assertEquals(file.getName(), textContents.trim());
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}
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@Test
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public void testPasteEnablement() throws Exception {
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IFile file = _project.getFile("model.properties");
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// Manually put the file on the clipboard
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getClipboard().setContents(new Object[] { new IResource[] { file }, file.getName() },
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new Transfer[] { ResourceTransfer.getInstance(), TextTransfer.getInstance() });
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IStructuredSelection sel = new StructuredSelection(_p1);
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_viewer.setSelection(sel);
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ActionContributionItem pasteActionItem = getAction(sel, "Paste");
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assertTrue(pasteActionItem.getAction().isEnabled(), "Paste action should be enabled when clipboard has resources");
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}
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@Test
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public void testCopyPasteRoundTrip() throws Exception {
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IFile file = _project.getFile("model.properties");
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assertTrue(file.exists());
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// 1. Copy
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IStructuredSelection selCopy = new StructuredSelection(file);
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_viewer.setSelection(selCopy);
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ActionContributionItem copyActionItem = getAction(selCopy, "Copy");
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copyActionItem.getAction().run();
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// 2. Paste into _p1
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IStructuredSelection selPaste = new StructuredSelection(_p1);
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_viewer.setSelection(selPaste);
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ActionContributionItem pasteActionItem = getAction(selPaste, "Paste");
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assertTrue(pasteActionItem.getAction().isEnabled());
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pasteActionItem.getAction().run();
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// 3. Verify
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IFile pastedFile = _p1.getFile(file.getName());
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waitForCondition("File should be pasted", () -> pastedFile.exists());
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assertTrue(pastedFile.exists(), "Pasted file should exist in target project");
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}
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@Test
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public void testContextMenuContainsCopyPasteDelete() throws Exception {
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IFile file = _project.getFile("model.properties");
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IStructuredSelection sel = new StructuredSelection(file);
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_viewer.setSelection(sel);
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getAction(sel, "Copy");
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getAction(sel, "Paste");
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getAction(sel, "Delete");
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}
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@Test
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public void testCopyDisabledForWorkspaceRoot() throws Exception {
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// Selecting the workspace root should enable the resource action provider
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// but the Copy action itself should be disabled for the root.
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IStructuredSelection sel = new StructuredSelection(ResourcesPlugin.getWorkspace().getRoot());
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_viewer.setSelection(sel);
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ActionContributionItem copyActionItem = getAction(sel, "Copy");
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assertFalse(copyActionItem.getAction().isEnabled(), "Copy action should be disabled for Workspace Root");
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}
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}

‎tests/org.eclipse.ui.tests.navigator/src/org/eclipse/ui/tests/navigator/NavigatorTestSuite.java‎

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FirstClassM1Tests.class, LinkHelperTest.class, ShowInTest.class, ResourceTransferTest.class,
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EvaluationCacheTest.class, ResourceMgmtActionProviderTests.class,
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NestedResourcesTests.class, PathComparatorTest.class, FoldersAsProjectsContributionTest.class,
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GoBackForwardsTest.class
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GoBackForwardsTest.class, CopyPasteActionTest.class
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// DnDTest.class, // DnDTest.testSetDragOperation() fails
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// PerformanceTest.class // Does not pass on all platforms see bug 264449
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})

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