Migrate test fixtures to non-deprecated contentTypes extension point

The org.eclipse.core.runtime.contentTypes extension point was deprecated
in 2018 and is being removed. Replace with its canonical successor
org.eclipse.core.contenttype.contentTypes in the four test fixture
plugin.xml files. The child element schema is identical, so this is a
mechanical id swap with no behavioral change.

These fixtures provide negative-case coverage (missing names, invalid
describers, empty file-extensions, missing alias targets) for the
content-type registry tests in org.eclipse.core.tests.resources.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: vogella

resources/tests/org.eclipse.core.tests.resources/Plugin_Testing/content/bundle01/plugin.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <?eclipse version="3.0"?>
 <plugin>
-	<extension point="org.eclipse.core.runtime.contentTypes">
+	<extension point="org.eclipse.core.contenttype.contentTypes">
 		<content-type id="missing" name="Missing"/>
 	</extension>	
 </plugin>

resources/tests/org.eclipse.core.tests.resources/Plugin_Testing/content/bundle02/plugin.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <?eclipse version="3.0"?>
 <plugin>
-	<extension point="org.eclipse.core.runtime.contentTypes">
+	<extension point="org.eclipse.core.contenttype.contentTypes">
 		<content-type id="missing-target" name="Missing alias target"
 		file-extensions="missing-target"/>		
 	</extension>	

resources/tests/org.eclipse.core.tests.resources/Plugin_Testing/content/bundle03/plugin.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <?eclipse version="3.0"?>
 <plugin>
-      <extension point="org.eclipse.core.runtime.contentTypes">
+      <extension point="org.eclipse.core.contenttype.contentTypes">
       <!-- this content type has an invalid describer, it should never be picked on content-based content type lookup -->
       <content-type
             name="Invalid Describer"

resources/tests/org.eclipse.core.tests.resources/Plugin_Testing/content/bundle04/plugin.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <?eclipse version="3.0"?>
 <plugin>
-	<extension point="org.eclipse.core.runtime.contentTypes">
+	<extension point="org.eclipse.core.contenttype.contentTypes">
 		<content-type id="empty_extension1" name="Empty Extension 1" file-extensions=""/>	
 		<content-type id="empty_extension2" name="Empty Extension 2" file-extensions="foo,"/>
 		<content-type id="empty_extension3" name="Empty Extension 3" file-extensions=",foo"/>

resources/tests/org.eclipse.core.tests.resources/src/org/eclipse/core/tests/resources/content/IContentTypeManagerTest.java

@@ -204,7 +204,7 @@ public void testAlias() throws Exception {
 		assertThat(selected).containsExactly(alias, derived);
 
 		// test late addition of content type
-		TestRegistryChangeListener listener = new TestRegistryChangeListener(Platform.PI_RUNTIME,
+		TestRegistryChangeListener listener = new TestRegistryChangeListener(IContentConstants.CONTENT_NAME,
 				ContentTypeBuilder.PT_CONTENTTYPES, null, null);
 		BundleTestingHelper.runWithBundles(() -> {
 			IContentType alias1 = contentTypeManager.getContentType(PI_RESOURCES_TESTS + ".alias");
@@ -761,7 +761,7 @@ public void testDynamicChanges() throws Exception {
 		assertEquals(text[0], text[1]);
 		assertEquals(text[0], text[1]);
 		// make arbitrary dynamic changes to the contentTypes extension point
-		TestRegistryChangeListener listener = new TestRegistryChangeListener(Platform.PI_RUNTIME,
+		TestRegistryChangeListener listener = new TestRegistryChangeListener(IContentConstants.CONTENT_NAME,
 				ContentTypeBuilder.PT_CONTENTTYPES, null, null);
 		BundleTestingHelper.runWithBundles(() -> {
 			IContentType missing = manager.getContentType("org.eclipse.bundle01.missing");
@@ -1031,7 +1031,7 @@ public void testInvalidMarkup() throws Exception {
 		assertThat(finder.findContentTypesFor("invalid.missing.identifier")).isEmpty();
 		assertThat(finder.findContentTypesFor("invalid.missing.name")).isEmpty();
 		assertNull(contentTypeManager.getContentType(PI_RESOURCES_TESTS + '.' + "invalid-missing-name"));
-		TestRegistryChangeListener listener = new TestRegistryChangeListener(Platform.PI_RUNTIME,
+		TestRegistryChangeListener listener = new TestRegistryChangeListener(IContentConstants.CONTENT_NAME,
 				ContentTypeBuilder.PT_CONTENTTYPES, null, null);
 		BundleTestingHelper.runWithBundles(() -> {
 			// ensure the invalid content types are not available
@@ -1173,7 +1173,7 @@ public void testNoExtensionAssociation() throws Exception {
 		IContentType[] selected = manager.findContentTypesFor("file_with_no_extension");
 		assertThat(selected).isEmpty();
 
-		TestRegistryChangeListener listener = new TestRegistryChangeListener(Platform.PI_RUNTIME,
+		TestRegistryChangeListener listener = new TestRegistryChangeListener(IContentConstants.CONTENT_NAME,
 				ContentTypeBuilder.PT_CONTENTTYPES, null, null);
 		BundleTestingHelper.runWithBundles(() -> {
 			final String namespace = "org.eclipse.bundle04";
@@ -1240,7 +1240,7 @@ public void testOrphanContentType() throws Exception {
 		assertThat(contentTypeManager.findContentTypesFor("foo.orphan2")).isEmpty();
 
 		// test late addition of content type - orphan2 should become visible
-		TestRegistryChangeListener listener = new TestRegistryChangeListener(Platform.PI_RUNTIME,
+		TestRegistryChangeListener listener = new TestRegistryChangeListener(IContentConstants.CONTENT_NAME,
 				ContentTypeBuilder.PT_CONTENTTYPES, null, null);
 
 		BundleTestingHelper.runWithBundles(() -> {