abstract Widget tests: take screenshot before dispose

#1518

Author: jukzi

bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/SWT.java

@@ -4937,7 +4937,6 @@ public static void error (int code, Throwable throwable, String detail) {
 		case ERROR_CANNOT_SET_TEXT:
 		case ERROR_ITEM_NOT_ADDED:
 		case ERROR_ITEM_NOT_REMOVED:
-		case ERROR_NO_HANDLES:
 		//FALL THROUGH
 
 		/* SWT Errors (fatal, may occur only on some platforms) */
@@ -4949,6 +4948,10 @@ public static void error (int code, Throwable throwable, String detail) {
 			error.throwable = throwable;
 			throw error;
 		}
+		case ERROR_NO_HANDLES:
+			SWTError error = new SWTError (code, message);
+			error.throwable = throwable;
+			throw error;
 	}
 
 	/* Unknown/Undefined Error */

tests/org.eclipse.swt.tests.win32/JUnit Tests/org/eclipse/swt/tests/win32/KeyboardLayoutTest.java

@@ -255,8 +255,12 @@ public void setUp() {
 
 	@After
 	public void tearDown() {
-		shell.dispose();
-		display.dispose();
+		if (shell != null) {
+			shell.dispose();
+		}
+		if (display != null) {
+			display.dispose();
+		}
 	}
 
 	protected static void failOnApiError(String name) {

tests/org.eclipse.swt.tests/JUnit Tests/org/eclipse/swt/tests/junit/Test_org_eclipse_swt_browser_Browser.java

@@ -76,7 +76,6 @@
 import org.eclipse.swt.layout.FillLayout;
 import org.eclipse.swt.widgets.Display;
 import org.eclipse.swt.widgets.Shell;
-import org.junit.After;
 import org.junit.Before;
 import org.junit.FixMethodOrder;
 import org.junit.Rule;
@@ -174,9 +173,9 @@ public void setUp() {
 }
 
 @Override
-@After
-public void tearDown() {
-	super.tearDown();
+protected void afterDispose(Display display) {
+	super.afterDispose(display);
+
 	Shell[] shells = Display.getDefault().getShells();
 	int disposedShells = 0;
 	for (Shell shell : shells) {

tests/org.eclipse.swt.tests/JUnit Tests/org/eclipse/swt/tests/junit/Test_org_eclipse_swt_custom_StyledText.java

@@ -76,12 +76,9 @@
 import org.eclipse.swt.widgets.Event;
 import org.eclipse.swt.widgets.ScrollBar;
 import org.eclipse.swt.widgets.Widget;
-import org.eclipse.test.Screenshots;
 import org.junit.Assume;
 import org.junit.Before;
-import org.junit.Rule;
 import org.junit.Test;
-import org.junit.rules.TestWatcher;
 
 /**
  * Automated Test Suite for class org.eclipse.swt.custom.StyledText
@@ -103,9 +100,6 @@ public class Test_org_eclipse_swt_custom_StyledText extends Test_org_eclipse_swt
 private boolean listenerCalled;
 private boolean listener2Called;
 
-@Rule
-public TestWatcher screenshotRule = Screenshots.onFailure();
-
 @Override
 @Before
 public void setUp() {

tests/org.eclipse.swt.tests/JUnit Tests/org/eclipse/swt/tests/junit/Test_org_eclipse_swt_custom_StyledText_multiCaretsSelections.java

@@ -39,9 +39,6 @@
  */
 public class Test_org_eclipse_swt_custom_StyledText_multiCaretsSelections {
 
-	@Rule
-	public TestWatcher screenshotRule = Screenshots.onFailure();
-
 	Shell shell;
 	StyledText text;
 	GC gc;
@@ -53,10 +50,12 @@ public void setUp() {
 		gc = new GC(text);
 	}
 
+	@Rule
+	public TestWatcher screenshotRule = Screenshots.onFailure(() -> this.shell);
+
 	@After
 	public void tearDown() {
 		gc.dispose();
-		shell.dispose();
 	}
 	@Test
 	public void test_MultiSelectionEdit() {

tests/org.eclipse.swt.tests/JUnit Tests/org/eclipse/swt/tests/junit/Test_org_eclipse_swt_widgets_Tree.java

@@ -33,12 +33,8 @@
 import org.eclipse.swt.widgets.Tree;
 import org.eclipse.swt.widgets.TreeColumn;
 import org.eclipse.swt.widgets.TreeItem;
-import org.eclipse.test.Screenshots;
 import org.junit.Before;
-import org.junit.Rule;
 import org.junit.Test;
-import org.junit.rules.TestName;
-import org.junit.rules.TestWatcher;
 
 /**
  * Automated Test Suite for class org.eclipse.swt.widgets.Tree
@@ -47,8 +43,7 @@
  */
 public class Test_org_eclipse_swt_widgets_Tree extends Test_org_eclipse_swt_widgets_Composite {
 
-@Rule
-public TestName testName = new TestName();
+private Tree tree;
 
 @Override
 @Before
@@ -750,9 +745,6 @@ public void test_showSelection() {
 	tree.showSelection();
 }
 
-/* custom */
-public Tree tree;
-
 /**
  * Clean up the environment for a new test.
  *
@@ -916,9 +908,6 @@ public void test_disposeItemNotTriggerSelection() {
 	assertFalse(selectionCalled[0]);
 }
 
-@Rule
-public TestWatcher screenshotRule = Screenshots.onFailure();
-
 @Test
 public void test_Virtual() {
 	tree.dispose();

tests/org.eclipse.swt.tests/JUnit Tests/org/eclipse/swt/tests/junit/Test_org_eclipse_swt_widgets_Widget.java

@@ -31,6 +31,7 @@
 import org.eclipse.swt.widgets.Listener;
 import org.eclipse.swt.widgets.Shell;
 import org.eclipse.swt.widgets.Widget;
+import org.eclipse.test.Screenshots.ScreenshotOnFailure;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Rule;
@@ -42,7 +43,10 @@
  *
  * @see org.eclipse.swt.widgets.Widget
  */
-public class Test_org_eclipse_swt_widgets_Widget{
+abstract class Test_org_eclipse_swt_widgets_Widget{
+	protected Shell shell;
+	private Widget widget;
+
 	// Use this variable to help validate callbacks
 	boolean listenerCalled;
 	/**
@@ -56,17 +60,27 @@ public void setUp() {
 	shell = new Shell();
 }
 
+@Rule
+public ScreenshotOnFailure screenshotRule = new ScreenshotOnFailure(()-> this.shell) {
+	@Override
+	public void dispose() {
+		Display display = null;
+		if (!disposedIntentionally) {
+			assertFalse(shell.isDisposed());
+			display = shell.getDisplay();
+		}
+		super.dispose();
+		afterDispose(display);
+	}
+};
+
 @After
 public void tearDown() {
 	if (widget != null) {
 		assertEquals(disposedIntentionally, widget.isDisposed());
 	}
-	Display display = null;
-	if (!disposedIntentionally) {
-		assertFalse(shell.isDisposed());
-		display = shell.getDisplay();
-	}
-	shell.dispose();
+}
+protected void afterDispose(Display display) {
 	if (widget != null) {
 		assertTrue(widget.isDisposed());
 		if(SwtTestUtil.isLinux && display != null) {
@@ -83,10 +97,7 @@ public void tearDown() {
 		assertNotExists(getWidgetTable(display), shell);
 	}
 }
-@Test
-public void test_ConstructorLorg_eclipse_swt_widgets_WidgetI() {
-	// abstract class
-}
+
 @Test
 public void test_addDisposeListenerLorg_eclipse_swt_events_DisposeListener() {
 	DisposeListener listener = e -> {
@@ -174,10 +185,6 @@ public void test_toString() {
 	assertTrue(widget.toString().length() > 0);
 }
 
-/* custom */
-public Shell shell;
-private Widget widget;
-
 protected void setWidget(Widget w) {
 	widget = w;
 }