diff --git a/ui/org.eclipse.pde.ui.tests/src/org/eclipse/pde/ui/tests/classpathupdater/ClasspathUpdaterTest.java b/ui/org.eclipse.pde.ui.tests/src/org/eclipse/pde/ui/tests/classpathupdater/ClasspathUpdaterTest.java
index 05faf376344..1166d6a93df 100644
--- a/ui/org.eclipse.pde.ui.tests/src/org/eclipse/pde/ui/tests/classpathupdater/ClasspathUpdaterTest.java
+++ b/ui/org.eclipse.pde.ui.tests/src/org/eclipse/pde/ui/tests/classpathupdater/ClasspathUpdaterTest.java
@@ -20,6 +20,8 @@
 import org.eclipse.pde.core.plugin.IPluginModelBase;
 import org.eclipse.pde.core.plugin.PluginRegistry;
 import org.eclipse.pde.internal.core.ClasspathComputer;
+import org.eclipse.pde.internal.core.ICoreConstants;
+import org.eclipse.pde.internal.core.PDECore;
 import org.eclipse.pde.internal.ui.wizards.tools.UpdateClasspathJob;
 import org.eclipse.pde.ui.tests.util.ProjectUtils;
 import org.junit.After;
@@ -32,6 +34,8 @@ public class ClasspathUpdaterTest {
 	private static IJavaProject jProject;
 
 	private static IClasspathEntry[] originalClasspath;
+	private static String originalTestPluginPattern;
+	private static Boolean expectIsTest;
 
 	@BeforeClass
 	public static void setUpBeforeClass() throws Exception {
@@ -39,6 +43,9 @@ public static void setUpBeforeClass() throws Exception {
 		assertTrue("Project was not created", project.exists());
 		jProject = JavaCore.create(project);
 		originalClasspath = jProject.getRawClasspath();
+		originalTestPluginPattern = PDECore.getDefault().getPreferencesManager()
+				.getString(ICoreConstants.TEST_PLUGIN_PATTERN);
+		expectIsTest = null;
 	}
 
 	@After
@@ -46,8 +53,20 @@ public void restoreOriginalClasspath() throws Exception {
 		jProject.setRawClasspath(originalClasspath, null);
 	}
 
+	@After
+	public void restoreOriginalTestPluginPattern() {
+		PDECore.getDefault().getPreferencesManager().setValue(ICoreConstants.TEST_PLUGIN_PATTERN,
+				originalTestPluginPattern);
+		expectIsTest = null;
+	}
+
+	private void setTestPluginPattern() {
+		PDECore.getDefault().getPreferencesManager().setValue(ICoreConstants.TEST_PLUGIN_PATTERN, project.getName());
+		expectIsTest = Boolean.TRUE;
+	}
+
 	@Test
-	public void testUpdateClasspath_PreserveAttributes() throws Exception {
+	public void test_PreserveAttributes() throws Exception {
 		runUpdateClasspathJob();
 		assertClasspathAttribute("JavaSE-17", IClasspathAttribute.MODULE, true, Boolean::valueOf);
 		assertClasspathAttribute("library.jar", IClasspathAttribute.TEST, true, Boolean::valueOf);
@@ -59,12 +78,22 @@ public void testUpdateClasspath_PreserveAttributes() throws Exception {
 				e -> "Asrc.zip".equals(nullOr(e.getSourceAttachmentPath(), IPath::lastSegment)));
 		assertClasspathProperty("src", "exported=false", e -> !e.isExported());
 		assertClasspathAttribute("src", IClasspathAttribute.IGNORE_OPTIONAL_PROBLEMS, true, Boolean::valueOf);
+		assertClasspathAttribute("src", IClasspathAttribute.TEST, true, Boolean::valueOf);
+		assertClasspathProperty("tests", "exported=false", e -> !e.isExported());
+		assertClasspathAttribute("tests", IClasspathAttribute.IGNORE_OPTIONAL_PROBLEMS, null, Boolean::valueOf);
+		assertClasspathAttribute("tests", IClasspathAttribute.TEST, expectIsTest, Boolean::valueOf);
 		assertClasspathOrder("A.jar", "src", "org.eclipse.pde.core.requiredPlugins", "JavaSE-17", "SOMEVAR",
-				"library.jar");
+				"library.jar", "tests");
+	}
+
+	@Test
+	public void test_PreserveAttributes_WithTestPluginName() throws Exception {
+		setTestPluginPattern();
+		test_PreserveAttributes();
 	}
 
 	@Test
-	public void testUpdateClasspath_CreateFromScratch() throws Exception {
+	public void test_CreateFromScratch() throws Exception {
 		jProject.setRawClasspath(new IClasspathEntry[0], null);
 
 		runUpdateClasspathJob();
@@ -76,11 +105,24 @@ public void testUpdateClasspath_CreateFromScratch() throws Exception {
 		assertClasspathProperty("A.jar", "exported=true", e -> e.isExported());
 		assertClasspathProperty("A.jar", "default source",
 				e -> "Asrc.zip".equals(nullOr(e.getSourceAttachmentPath(), IPath::lastSegment)));
-		assertClasspathOrder("JavaSE-17", "org.eclipse.pde.core.requiredPlugins", "library.jar", "A.jar");
+		assertClasspathProperty("src", "exported=false", e -> !e.isExported());
+		assertClasspathAttribute("src", IClasspathAttribute.IGNORE_OPTIONAL_PROBLEMS, null, Boolean::valueOf);
+		assertClasspathAttribute("src", IClasspathAttribute.TEST, expectIsTest, Boolean::valueOf);
+		assertClasspathProperty("tests", "exported=false", e -> !e.isExported());
+		assertClasspathAttribute("tests", IClasspathAttribute.IGNORE_OPTIONAL_PROBLEMS, null, Boolean::valueOf);
+		assertClasspathAttribute("tests", IClasspathAttribute.TEST, expectIsTest, Boolean::valueOf);
+		assertClasspathOrder("JavaSE-17", "org.eclipse.pde.core.requiredPlugins", "library.jar", "A.jar", "src",
+				"tests");
+	}
+
+	@Test
+	public void test_CreateFromScatch_WithTestPluginName() throws Exception {
+		setTestPluginPattern();
+		test_CreateFromScratch();
 	}
 
 	@Test
-	public void testClasspathComputer_ChangeSourceAttachment() throws Exception {
+	public void test_ChangeSourceAttachment() throws Exception {
 		Map<String, IPath> sourceMap = Map.of( //
 				"A.jar", IPath.fromOSString("library.jar"), //
 				"library.jar", IPath.fromOSString("A.jar"));
@@ -101,8 +143,18 @@ public void testClasspathComputer_ChangeSourceAttachment() throws Exception {
 				e -> "library.jar".equals(nullOr(e.getSourceAttachmentPath(), IPath::lastSegment)));
 		assertClasspathProperty("src", "exported=false", e -> !e.isExported());
 		assertClasspathAttribute("src", IClasspathAttribute.IGNORE_OPTIONAL_PROBLEMS, true, Boolean::valueOf);
+		assertClasspathAttribute("src", IClasspathAttribute.TEST, true, Boolean::valueOf);
+		assertClasspathProperty("tests", "exported=false", e -> !e.isExported());
+		assertClasspathAttribute("tests", IClasspathAttribute.IGNORE_OPTIONAL_PROBLEMS, null, Boolean::valueOf);
+		assertClasspathAttribute("tests", IClasspathAttribute.TEST, expectIsTest, Boolean::valueOf);
 		assertClasspathOrder("A.jar", "src", "org.eclipse.pde.core.requiredPlugins", "JavaSE-17", "SOMEVAR",
-				"library.jar");
+				"library.jar", "tests");
+	}
+
+	@Test
+	public void test_ChangeSourceAttachment_WithTestPluginName() throws Exception {
+		setTestPluginPattern();
+		test_ChangeSourceAttachment();
 	}
 
 	private void runUpdateClasspathJob() throws InterruptedException {
diff --git a/ui/org.eclipse.pde.ui.tests/tests/projects/classpathupdater/.classpath b/ui/org.eclipse.pde.ui.tests/tests/projects/classpathupdater/.classpath
index 5bccae7fc10..668576bd954 100644
--- a/ui/org.eclipse.pde.ui.tests/tests/projects/classpathupdater/.classpath
+++ b/ui/org.eclipse.pde.ui.tests/tests/projects/classpathupdater/.classpath
@@ -1,9 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
 	<classpathentry kind="lib" path="A.jar"/>
-	<classpathentry kind="src" path="src">
+	<classpathentry kind="src" output="testbin" path="src">
 		<attributes>
 			<attribute name="ignore_optional_problems" value="true"/>
+			<attribute name="test" value="true"/>
 		</attributes>
 	</classpathentry>
 	<classpathentry kind="con" path="org.eclipse.pde.core.requiredPlugins"/>
diff --git a/ui/org.eclipse.pde.ui.tests/tests/projects/classpathupdater/build.properties b/ui/org.eclipse.pde.ui.tests/tests/projects/classpathupdater/build.properties
index e7b9dc306f7..d5066b38263 100644
--- a/ui/org.eclipse.pde.ui.tests/tests/projects/classpathupdater/build.properties
+++ b/ui/org.eclipse.pde.ui.tests/tests/projects/classpathupdater/build.properties
@@ -11,7 +11,10 @@
 # Contributors:
 #     IBM Corporation - initial API and implementation
 ###############################################################################
-output.. = bin/
+output.. = testbin/,\
+           bin/
+source.. = src/,\
+           tests/
 bin.includes = META-INF/,\
                .,\
                library.jar, \