Add tests

Author: SougandhS

org.eclipse.jdt.debug.tests/testprograms/WatchItemContext.java

@@ -0,0 +1,44 @@
+/*******************************************************************************
+ * Copyright (c) 2026 IBM Corporation.
+ *
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ * 
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+
+/**
+ * WatchItemContext
+ */
+public class WatchItemContext {
+
+	private class X {
+		private int x = 0;
+	}
+
+	private class Y {
+		private X x = new X();
+		private int y = 0;
+	}
+
+	private class Z {
+		private Y y = new Y();
+		private int z = 0;
+	}
+
+	public static void main(String[] args) {
+		new WatchItemContext().foo();
+	}
+
+	public void foo() {
+		X x = new X();
+		Y y = new Y();
+		Z z = new Z();
+		System.out.println(x + " " + y + " " + z);
+	}
+}

org.eclipse.jdt.debug.tests/tests/org/eclipse/jdt/debug/tests/AbstractDebugTest.java

@@ -219,7 +219,7 @@ public abstract class AbstractDebugTest extends TestCase implements  IEvaluation
 			"OutSync", "OutSync2", "ConsoleOutputUmlaut", "ErrorRecurrence", "ModelPresentationTests", "Bug565982",
 			"SuspendVMConditionalBreakpointsTestSnippet", "FileConditionSnippet2", "compare.CompareObjectsStringTest", "compare.CompareListObjects",
 			"compare.CompareMapObjects", "compare.CompareSetObjects", "compare.CompareNormalObjects", "compare.CompareArrayObjects",
-			"StatementStep", "StatementStepArgument", "StatementStepNested", "StatementStepWithOperations" };
+			"StatementStep", "StatementStepArgument", "StatementStepNested", "StatementStepWithOperations", "WatchItemContext" };
 
 	/**
 	 * the default timeout

org.eclipse.jdt.debug.tests/tests/org/eclipse/jdt/debug/tests/core/WatchExpressionTests.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2015 IBM Corporation and others.
+ * Copyright (c) 2000, 2026 IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -13,10 +13,13 @@
  *******************************************************************************/
 package org.eclipse.jdt.debug.tests.core;
 
+import java.util.List;
+
 import org.eclipse.debug.core.DebugEvent;
 import org.eclipse.debug.core.DebugPlugin;
 import org.eclipse.debug.core.IExpressionManager;
 import org.eclipse.debug.core.model.IValue;
+import org.eclipse.debug.core.model.IVariable;
 import org.eclipse.debug.core.model.IWatchExpression;
 import org.eclipse.debug.internal.ui.DebugUIPlugin;
 import org.eclipse.debug.ui.IDebugUIConstants;
@@ -27,6 +30,7 @@
 import org.eclipse.jdt.debug.testplugin.DebugElementEventWaiter;
 import org.eclipse.jdt.debug.testplugin.ExpressionWaiter;
 import org.eclipse.jdt.debug.tests.AbstractDebugTest;
+import org.eclipse.jdt.internal.debug.ui.heapwalking.JavaNestedWatchExpressionFilter;
 import org.eclipse.swt.widgets.Display;
 import org.eclipse.ui.IWorkbench;
 import org.eclipse.ui.IWorkbenchPage;
@@ -165,6 +169,32 @@ public void DisabledtestStepping() throws Exception {
 		}
 	}
 
+	public void testExpressionContext() throws Exception {
+		String typeName = "WatchItemContext";
+		createLineBreakpoint(42, typeName);
+		IJavaThread thread = null;
+		try {
+			thread = launchToBreakpoint(typeName);
+			assertNotNull("Breakpoint not hit within timeout period", thread);
+			IJavaStackFrame stackFrame = (IJavaStackFrame) thread.getTopStackFrame();
+			IVariable v1 = stackFrame.findVariable("y");
+			IVariable v2 = v1.getValue().getVariables()[2];
+			JavaNestedWatchExpressionFilter javaFilter = new JavaNestedWatchExpressionFilter();
+			assertTrue(javaFilter.canCreateWatchExpression(List.of(v1, v2)));
+			String exp = javaFilter.createWatchExpression(List.of(v1, v2));
+			assertEquals("Invalid Expression", "y.y", exp);
+			IWatchExpression expression = getExpressionManager().newWatchExpression(exp);
+			DebugElementEventWaiter waiter = new ExpressionWaiter(DebugEvent.CHANGE, expression);
+			getExpressionManager().addExpression(expression);
+			waiter.waitForEvent();
+			assertEquals("Wrong Value", "0", expression.getValue().toString());
+		} finally {
+			terminateAndRemove(thread);
+			removeAllBreakpoints();
+			removeAllExpressions();
+		}
+	}
+
 	/**
 	 * Dumps any error messages to the console.
      */