Move plugin constants from ResourceTest to utility class #903

This change moves the constants and related methods referring to
extensions of resources test plugin from the ResourceTest class to a
separate utility class. It prepares for removing the JUnit 3 inheritance
hierarchy of ResourceTest to migrate to JUnit 4.

Contributes to
#903

resources/tests/org.eclipse.core.tests.resources/src/org/eclipse/core/tests/internal/builders/BuilderNatureTest.java

@@ -13,7 +13,8 @@
  *******************************************************************************/
 package org.eclipse.core.tests.internal.builders;
 
-
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.NATURE_SNOW;
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.NATURE_WATER;
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.is;
 import static org.hamcrest.Matchers.not;

resources/tests/org.eclipse.core.tests.resources/src/org/eclipse/core/tests/internal/builders/ParallelBuildChainTest.java

@@ -13,6 +13,7 @@
  *******************************************************************************/
 package org.eclipse.core.tests.internal.builders;
 
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.PI_RESOURCES_TESTS;
 import static org.eclipse.core.tests.resources.TestUtil.waitForCondition;
 import static org.hamcrest.CoreMatchers.not;
 import static org.hamcrest.MatcherAssert.assertThat;

resources/tests/org.eclipse.core.tests.resources/src/org/eclipse/core/tests/internal/filesystem/wrapper/WrapperFileSystem.java

@@ -14,6 +14,8 @@
  *******************************************************************************/
 package org.eclipse.core.tests.internal.filesystem.wrapper;
 
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.PI_RESOURCES_TESTS;
+
 import java.net.URI;
 import java.net.URISyntaxException;
 import org.eclipse.core.filesystem.EFS;
@@ -23,7 +25,6 @@
 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.IPath;
 import org.eclipse.core.tests.harness.CoreTest;
-import org.eclipse.core.tests.resources.ResourceTest;
 
 /**
  * A simple file system implementation that acts as a wrapper around the
@@ -92,7 +93,7 @@ public IFileStore getStore(URI uri) {
 		try {
 			baseStore = EFS.getStore(getBasicURI(uri));
 		} catch (CoreException e) {
-			CoreTest.log(ResourceTest.PI_RESOURCES_TESTS, e);
+			CoreTest.log(PI_RESOURCES_TESTS, e);
 			return NULL_ROOT;
 		}
 		return WrapperFileStore.newInstance(customFS, baseStore);

resources/tests/org.eclipse.core.tests.resources/src/org/eclipse/core/tests/internal/properties/PropertyManagerTest.java

@@ -14,6 +14,7 @@
  *******************************************************************************/
 package org.eclipse.core.tests.internal.properties;
 
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.PI_RESOURCES_TESTS;
 import static org.junit.Assert.assertNotEquals;
 
 import java.nio.charset.StandardCharsets;

resources/tests/org.eclipse.core.tests.resources/src/org/eclipse/core/tests/resources/IProjectTest.java

@@ -14,6 +14,9 @@
  *******************************************************************************/
 package org.eclipse.core.tests.resources;
 
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.NATURE_EARTH;
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.NATURE_MISSING;
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.NATURE_SIMPLE;
 import static org.junit.Assert.assertThrows;
 
 import java.io.ByteArrayInputStream;

resources/tests/org.eclipse.core.tests.resources/src/org/eclipse/core/tests/resources/IResourceChangeListenerTest.java

@@ -14,6 +14,8 @@
  ******************************************************************************/
 package org.eclipse.core.tests.resources;
 
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.NATURE_SIMPLE;
+
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.util.Dictionary;

resources/tests/org.eclipse.core.tests.resources/src/org/eclipse/core/tests/resources/ISynchronizerTest.java

@@ -14,6 +14,7 @@
  *******************************************************************************/
 package org.eclipse.core.tests.resources;
 
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.PI_RESOURCES_TESTS;
 import static org.junit.Assert.assertThrows;
 
 import java.io.DataInputStream;

resources/tests/org.eclipse.core.tests.resources/src/org/eclipse/core/tests/resources/IWorkspaceTest.java

@@ -14,6 +14,19 @@
  *******************************************************************************/
 package org.eclipse.core.tests.resources;
 
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.NATURE_CYCLE1;
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.NATURE_CYCLE2;
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.NATURE_CYCLE3;
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.NATURE_EARTH;
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.NATURE_INVALID;
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.NATURE_MUD;
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.NATURE_SIMPLE;
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.NATURE_SNOW;
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.NATURE_WATER;
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.SET_OTHER;
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.SET_STATE;
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.getInvalidNatureSets;
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.getValidNatureSets;
 import static org.junit.Assert.assertNotEquals;
 import static org.junit.Assert.assertThrows;
 

resources/tests/org.eclipse.core.tests.resources/src/org/eclipse/core/tests/resources/LinkedDotProjectTest.java

@@ -10,12 +10,14 @@
  ******************************************************************************/
 package org.eclipse.core.tests.resources;
 
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.NATURE_EARTH;
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.NATURE_MISSING;
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.NATURE_SIMPLE;
 import static org.junit.Assert.assertNotEquals;
 import static org.junit.Assert.assertThrows;
 
 import java.io.File;
 import java.nio.file.Files;
-
 import org.eclipse.core.resources.IFile;
 import org.eclipse.core.resources.IProject;
 import org.eclipse.core.resources.IProjectDescription;

resources/tests/org.eclipse.core.tests.resources/src/org/eclipse/core/tests/resources/LinkedResourceTest.java

@@ -14,6 +14,7 @@
  *******************************************************************************/
 package org.eclipse.core.tests.resources;
 
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.NATURE_SIMPLE;
 import static org.junit.Assert.assertThrows;
 
 import java.io.BufferedInputStream;

resources/tests/org.eclipse.core.tests.resources/src/org/eclipse/core/tests/resources/NatureTest.java

@@ -13,6 +13,14 @@
  *******************************************************************************/
 package org.eclipse.core.tests.resources;
 
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.NATURE_127562;
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.NATURE_EARTH;
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.NATURE_MISSING;
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.NATURE_SIMPLE;
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.NATURE_SNOW;
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.NATURE_WATER;
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.getInvalidNatureSets;
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.getValidNatureSets;
 import static org.junit.Assert.assertThrows;
 
 import java.io.ByteArrayInputStream;

resources/tests/org.eclipse.core.tests.resources/src/org/eclipse/core/tests/resources/ResourceTest.java

@@ -14,6 +14,7 @@
  *******************************************************************************/
 package org.eclipse.core.tests.resources;
 
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.PI_RESOURCES_TESTS;
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.is;
 import static org.hamcrest.Matchers.not;
@@ -73,40 +74,6 @@
  * Superclass for tests that use the Eclipse Platform workspace.
  */
 public abstract class ResourceTest extends CoreTest {
-	//nature that installs and runs a builder (regression test for bug 29116)
-	protected static final String NATURE_29116 = "org.eclipse.core.tests.resources.nature29116";
-
-	//cycle1 requires: cycle2
-	protected static final String NATURE_CYCLE1 = "org.eclipse.core.tests.resources.cycle1";
-	//cycle2 requires: cycle3
-	protected static final String NATURE_CYCLE2 = "org.eclipse.core.tests.resources.cycle2";
-
-	//constants for nature ids
-
-	//cycle3 requires: cycle1
-	protected static final String NATURE_CYCLE3 = "org.eclipse.core.tests.resources.cycle3";
-	//earthNature, one-of: stateSet
-	protected static final String NATURE_EARTH = "org.eclipse.core.tests.resources.earthNature";
-	//invalidNature
-	protected static final String NATURE_INVALID = "org.eclipse.core.tests.resources.invalidNature";
-	//missing nature
-	protected static final String NATURE_MISSING = "no.such.nature.Missing";
-	//missing pre-req nature
-	protected static final String NATURE_MISSING_PREREQ = "org.eclipse.core.tests.resources.missingPrerequisiteNature";
-	//mudNature, requires: waterNature, earthNature, one-of: otherSet
-	protected static final String NATURE_MUD = "org.eclipse.core.tests.resources.mudNature";
-	//simpleNature
-	protected static final String NATURE_SIMPLE = "org.eclipse.core.tests.resources.simpleNature";
-	//nature for regression tests of bug 127562
-	protected static final String NATURE_127562 = "org.eclipse.core.tests.resources.bug127562Nature";
-	//snowNature, requires: waterNature, one-of: otherSet
-	protected static final String NATURE_SNOW = "org.eclipse.core.tests.resources.snowNature";
-	//waterNature, one-of: stateSet
-	protected static final String NATURE_WATER = "org.eclipse.core.tests.resources.waterNature";
-	public static final String PI_RESOURCES_TESTS = "org.eclipse.core.tests.resources"; //$NON-NLS-1$
-	protected static final String SET_OTHER = "org.eclipse.core.tests.resources.otherSet";
-	//constants for nature sets
-	protected static final String SET_STATE = "org.eclipse.core.tests.resources.stateSet";
 
 	/**
 	 * For retrieving the test name when executing test class with JUnit 4.
@@ -834,25 +801,6 @@ protected String getClassName() {
 		return fullClassName.substring(fullClassName.lastIndexOf('.') + 1);
 	}
 
-	/**
-	 * Returns invalid sets of natures
-	 */
-	protected String[][] getInvalidNatureSets() {
-		return new String[][] {{NATURE_SNOW}, //missing water pre-req
-				{NATURE_WATER, NATURE_EARTH}, //duplicates from state-set
-				{NATURE_WATER, NATURE_MUD}, //missing earth pre-req
-				{NATURE_WATER, NATURE_EARTH, NATURE_MUD}, //duplicates from state-set
-				{NATURE_SIMPLE, NATURE_SNOW, NATURE_WATER, NATURE_MUD}, //duplicates from other-set, missing pre-req
-				{NATURE_MISSING}, //doesn't exist
-				{NATURE_SIMPLE, NATURE_MISSING}, //missing doesn't exist
-				{NATURE_MISSING_PREREQ}, //requires nature that doesn't exist
-				{NATURE_SIMPLE, NATURE_MISSING_PREREQ}, //requires nature that doesn't exist
-				{NATURE_CYCLE1}, //missing pre-req
-				{NATURE_CYCLE2, NATURE_CYCLE3}, //missing pre-req
-				{NATURE_CYCLE1, NATURE_SIMPLE, NATURE_CYCLE2, NATURE_CYCLE3}, //cycle
-		};
-	}
-
 	protected String getLineSeparatorFromFile(IFile file) {
 		if (file.exists()) {
 			InputStream input = null;
@@ -919,13 +867,6 @@ public String getUniqueString() {
 		return new UniversalUniqueIdentifier().toString();
 	}
 
-	/**
-	 * Returns valid sets of natures
-	 */
-	protected String[][] getValidNatureSets() {
-		return new String[][] {{}, {NATURE_SIMPLE}, {NATURE_SNOW, NATURE_WATER}, {NATURE_EARTH}, {NATURE_WATER, NATURE_SIMPLE, NATURE_SNOW},};
-	}
-
 	/**
 	 * Checks whether the local file system supports accessing and modifying
 	 * the given attribute.

resources/tests/org.eclipse.core.tests.resources/src/org/eclipse/core/tests/resources/ResourceTestPluginConstants.java

@@ -0,0 +1,81 @@
+/*******************************************************************************
+ * Copyright (c) 2023 Vector Informatik GmbH and others.
+ *
+ * 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
+ *
+ *******************************************************************************/
+package org.eclipse.core.tests.resources;
+
+/**
+ * A utility class representing information about the extensions defined in this
+ * test project.
+ */
+public final class ResourceTestPluginConstants {
+	public static final String PI_RESOURCES_TESTS = "org.eclipse.core.tests.resources"; //$NON-NLS-1$
+
+	// nature that installs and runs a builder (regression test for bug 29116)
+	public static final String NATURE_29116 = "org.eclipse.core.tests.resources.nature29116";
+	// cycle1 requires: cycle2
+	public static final String NATURE_CYCLE1 = "org.eclipse.core.tests.resources.cycle1";
+	// cycle2 requires: cycle3
+	public static final String NATURE_CYCLE2 = "org.eclipse.core.tests.resources.cycle2";
+	// cycle3 requires: cycle1
+	public static final String NATURE_CYCLE3 = "org.eclipse.core.tests.resources.cycle3";
+	// earthNature, one-of: stateSet
+	public static final String NATURE_EARTH = "org.eclipse.core.tests.resources.earthNature";
+	// invalidNature
+	public static final String NATURE_INVALID = "org.eclipse.core.tests.resources.invalidNature";
+	// missing nature
+	public static final String NATURE_MISSING = "no.such.nature.Missing";
+	// missing pre-req nature
+	public static final String NATURE_MISSING_PREREQ = "org.eclipse.core.tests.resources.missingPrerequisiteNature";
+	// mudNature, requires: waterNature, earthNature, one-of: otherSet
+	public static final String NATURE_MUD = "org.eclipse.core.tests.resources.mudNature";
+	// simpleNature
+	public static final String NATURE_SIMPLE = "org.eclipse.core.tests.resources.simpleNature";
+	// nature for regression tests of bug 127562
+	public static final String NATURE_127562 = "org.eclipse.core.tests.resources.bug127562Nature";
+	// snowNature, requires: waterNature, one-of: otherSet
+	public static final String NATURE_SNOW = "org.eclipse.core.tests.resources.snowNature";
+	// waterNature, one-of: stateSet
+	public static final String NATURE_WATER = "org.eclipse.core.tests.resources.waterNature";
+	public static final String SET_OTHER = "org.eclipse.core.tests.resources.otherSet";
+	// constants for nature sets
+	public static final String SET_STATE = "org.eclipse.core.tests.resources.stateSet";
+
+	private ResourceTestPluginConstants() {
+	}
+
+	/**
+	 * Returns valid sets of natures
+	 */
+	public static String[][] getValidNatureSets() {
+		return new String[][] { {}, { NATURE_SIMPLE }, { NATURE_SNOW, NATURE_WATER }, { NATURE_EARTH },
+				{ NATURE_WATER, NATURE_SIMPLE, NATURE_SNOW }, };
+	}
+
+	/**
+	 * Returns invalid sets of natures
+	 */
+	public static String[][] getInvalidNatureSets() {
+		return new String[][] { { NATURE_SNOW }, // missing water pre-req
+				{ NATURE_WATER, NATURE_EARTH }, // duplicates from state-set
+				{ NATURE_WATER, NATURE_MUD }, // missing earth pre-req
+				{ NATURE_WATER, NATURE_EARTH, NATURE_MUD }, // duplicates from state-set
+				{ NATURE_SIMPLE, NATURE_SNOW, NATURE_WATER, NATURE_MUD }, // duplicates from other-set, missing pre-req
+				{ NATURE_MISSING }, // doesn't exist
+				{ NATURE_SIMPLE, NATURE_MISSING }, // missing doesn't exist
+				{ NATURE_MISSING_PREREQ }, // requires nature that doesn't exist
+				{ NATURE_SIMPLE, NATURE_MISSING_PREREQ }, // requires nature that doesn't exist
+				{ NATURE_CYCLE1 }, // missing pre-req
+				{ NATURE_CYCLE2, NATURE_CYCLE3 }, // missing pre-req
+				{ NATURE_CYCLE1, NATURE_SIMPLE, NATURE_CYCLE2, NATURE_CYCLE3 }, // cycle
+		};
+	}
+
+}

resources/tests/org.eclipse.core.tests.resources/src/org/eclipse/core/tests/resources/perf/PropertyManagerPerformanceTest.java

@@ -14,6 +14,8 @@
  *******************************************************************************/
 package org.eclipse.core.tests.resources.perf;
 
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.PI_RESOURCES_TESTS;
+
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;

resources/tests/org.eclipse.core.tests.resources/src/org/eclipse/core/tests/resources/regression/Bug_029116.java

@@ -13,6 +13,8 @@
  *******************************************************************************/
 package org.eclipse.core.tests.resources.regression;
 
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.NATURE_29116;
+
 import org.eclipse.core.resources.IProject;
 import org.eclipse.core.resources.IProjectDescription;
 import org.eclipse.core.runtime.CoreException;

resources/tests/org.eclipse.core.tests.resources/src/org/eclipse/core/tests/resources/regression/Bug_297635.java

@@ -14,6 +14,7 @@
  *******************************************************************************/
 package org.eclipse.core.tests.resources.regression;
 
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.PI_RESOURCES_TESTS;
 import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.verify;
 

resources/tests/org.eclipse.core.tests.resources/src/org/eclipse/core/tests/resources/regression/Bug_378156.java

@@ -13,6 +13,8 @@
  *******************************************************************************/
 package org.eclipse.core.tests.resources.regression;
 
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.PI_RESOURCES_TESTS;
+
 import java.util.concurrent.Semaphore;
 import org.eclipse.core.resources.ICommand;
 import org.eclipse.core.resources.IFile;

resources/tests/org.eclipse.core.tests.resources/src/org/eclipse/core/tests/resources/session/Bug_266907.java

@@ -13,6 +13,7 @@
  *******************************************************************************/
 package org.eclipse.core.tests.resources.session;
 
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.PI_RESOURCES_TESTS;
 import static org.hamcrest.CoreMatchers.is;
 import static org.hamcrest.MatcherAssert.assertThat;
 

resources/tests/org.eclipse.core.tests.resources/src/org/eclipse/core/tests/resources/session/TestBug93473.java

@@ -13,6 +13,8 @@
  *******************************************************************************/
 package org.eclipse.core.tests.resources.session;
 
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.PI_RESOURCES_TESTS;
+
 import junit.framework.Test;
 import org.eclipse.core.internal.resources.ContentDescriptionManager;
 import org.eclipse.core.internal.resources.Workspace;

resources/tests/org.eclipse.core.tests.resources/src/org/eclipse/core/tests/resources/session/TestMissingBuilder.java

@@ -13,6 +13,9 @@
  *******************************************************************************/
 package org.eclipse.core.tests.resources.session;
 
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.NATURE_SNOW;
+import static org.eclipse.core.tests.resources.ResourceTestPluginConstants.NATURE_WATER;
+
 import java.io.ByteArrayInputStream;
 import java.io.InputStream;
 import junit.framework.Test;