tests/org.eclipse.emf.ecp.ide.util.test/src/org/eclipse/emf/ecp/ide/util/test/EcoreHelperCyclicDependencies_PTest.java

/*******************************************************************************
 * Copyright (c) 2011-2018 EclipseSource Muenchen GmbH and others.
 *
 * All rights reserved. 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:
 * EclipseSource Munich - initial API and implementation
 *
 ******************************************************************************/
package org.eclipse.emf.ecp.ide.util.test;

import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

import java.io.IOException;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IWorkspaceRoot;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.emf.ecore.EPackage;
import org.eclipse.emf.ecore.EPackage.Registry;
import org.eclipse.emf.ecp.ide.spi.util.EcoreHelper;
import org.eclipse.jface.resource.JFaceResources;
import org.junit.After;
import org.junit.BeforeClass;
import org.junit.Test;

public class EcoreHelperCyclicDependencies_PTest {
	private final Registry packageRegistry = EPackage.Registry.INSTANCE;
	private static String dEcorePath = "/TestEcoreHelperProjectResources/D.ecore";
	private static String eEcorePath = "/TestEcoreHelperProjectResources/E.ecore";
	private static String fEcorePath = "/TestEcoreHelperProjectResources/F.ecore";

	// BEGIN SUPRESS CATCH EXCEPTION
	@BeforeClass
	public static void setUpBeforeClass() throws Exception {
		try {
			JFaceResources.getImageRegistry();
		} catch (final RuntimeException e) {
			// expected fail, some strange initialization error is happing
		}
		final IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();
		final IProject project = root.getProject("TestEcoreHelperProjectResources");
		// create resources to register and unregister
		if (!project.exists()) {
			installResourcesProject();
		}
	}

	private static void installResourcesProject() throws Exception {
		final ProjectInstallerWizard wiz = new ProjectInstallerWizard();
		wiz.installExample(new NullProgressMonitor());
	}
	// END SUPRESS CATCH EXCEPTION

	@Test
	public void testRegisterUnregister() throws IOException {
		// check initial state
		assertFalse("Package D is already in the registry!",
			packageRegistry.containsKey("d.nsuri"));
		assertFalse("Package E is already in the registry!",
			packageRegistry.containsKey("e.nsuri"));
		assertFalse("Package F is already in the registry!",
			packageRegistry.containsKey("f.nsuri"));

		// register D references E references F references D
		EcoreHelper.registerEcore(dEcorePath);
		assertTrue("Package D not in the registry!",
			packageRegistry.containsKey("d.nsuri"));
		assertTrue("Package E not in the registry!",
			packageRegistry.containsKey("e.nsuri"));
		assertTrue("Package F not in the registry!",
			packageRegistry.containsKey("f.nsuri"));

		// unregister
		EcoreHelper.unregisterEcore(dEcorePath);
		assertFalse("Package D is still in the registry!",
			packageRegistry.containsKey("d.nsuri"));
		assertFalse("Package E is still in the registry!",
			packageRegistry.containsKey("e.nsuri"));
		assertFalse("Package F is still in the registry!",
			packageRegistry.containsKey("f.nsuri"));
	}

	@Test
	public void testUnregisterMultipleUsage() throws IOException {
		// setup
		EcoreHelper.registerEcore(dEcorePath);
		EcoreHelper.registerEcore(eEcorePath);
		EcoreHelper.registerEcore(fEcorePath);
		assertTrue("Package D not in the registry!",
			packageRegistry.containsKey("d.nsuri"));
		assertTrue("Package E not in the registry!",
			packageRegistry.containsKey("e.nsuri"));
		assertTrue("Package F not in the registry!",
			packageRegistry.containsKey("f.nsuri"));

		// unregister D references E
		EcoreHelper.unregisterEcore(dEcorePath);
		assertTrue("Package D not in the registry!",
			packageRegistry.containsKey("d.nsuri"));
		assertTrue("Package E not in the registry!",
			packageRegistry.containsKey("e.nsuri"));
		assertTrue("Package F not in the registry!",
			packageRegistry.containsKey("f.nsuri"));

		// unregister E references F
		EcoreHelper.unregisterEcore(eEcorePath);
		assertTrue("Package D not in the registry!",
			packageRegistry.containsKey("d.nsuri"));
		assertTrue("Package E not in the registry!",
			packageRegistry.containsKey("e.nsuri"));
		assertTrue("Package F not in the registry!",
			packageRegistry.containsKey("f.nsuri"));

		// unregister F references D
		EcoreHelper.unregisterEcore(fEcorePath);
		assertFalse("Package D is still in the registry!",
			packageRegistry.containsKey("d.nsuri"));
		assertFalse("Package E is still in the registry!",
			packageRegistry.containsKey("e.nsuri"));
		assertFalse("Package F is still in the registry!",
			packageRegistry.containsKey("f.nsuri"));
	}

	/**
	 * @throws java.lang.Exception
	 */
	@After
	public void tearDown() throws Exception {
		EcoreHelper.unregisterEcore(dEcorePath);
		EcoreHelper.unregisterEcore(eEcorePath);
		EcoreHelper.unregisterEcore(fEcorePath);
	}

}