Add SingletonServiceTest: tests listening to plugin change events.

Author: gab1one

src/test/java/org/scijava/plugin/SingletonServiceTest.java

@@ -0,0 +1,119 @@
+/*
+ * #%L
+ * SciJava Common shared library for SciJava software.
+ * %%
+ * Copyright (C) 2009 - 2018 Board of Regents of the University of
+ * Wisconsin-Madison, Broad Institute of MIT and Harvard, Max Planck
+ * Institute of Molecular Cell Biology and Genetics, University of
+ * Konstanz, and KNIME GmbH.
+ * %%
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ * #L%
+ */
+
+package org.scijava.plugin;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import java.util.List;
+
+import org.junit.Test;
+import org.scijava.Context;
+
+/**
+ * Tests for the {@link SingletonService}
+ *
+ * @author Gabriel Einsdorf KNIME GmbH
+ */
+public class SingletonServiceTest {
+
+	@Test
+	public void testListenToRemove() {
+
+		final Context ctx = new Context(PluginService.class, DummySingletonService.class,
+				DummySingletonService2.class);
+
+		final DummySingletonService dss = ctx.getService(
+			DummySingletonService.class);
+
+		final DummySingletonService2 dss2 = ctx.getService(
+			DummySingletonService2.class);
+
+		final List<DummyPlugin> instances = dss.getInstances();
+		final DummyPlugin dummy = instances.get(0);
+
+		assertFalse("Service not correctly initialized", dss2.getInstances()
+			.isEmpty());
+
+		// test successful removal
+		final PluginService ps = ctx.getService(PluginService.class);
+		ps.removePlugin(dummy.getInfo());
+
+		assertFalse("Plugin was removed from wrong service!", dss2.getInstances()
+			.isEmpty());
+		assertTrue("Plugin was not removed!", dss.getInstances().isEmpty());
+
+		// test successful add
+		ps.addPlugin(dummy.getInfo());
+		assertEquals("Wrong number of plugins in service:", 1, dss.getInstances()
+			.size());
+		assertEquals("Wrong number of plugins in independent service:", 1, dss2
+			.getInstances().size());
+	}
+
+	@Plugin(type = DummyPlugin.class)
+	public static class DummyPlugin extends AbstractRichPlugin implements
+		SingletonPlugin
+	{
+		// NB: No implementation needed.
+	}
+
+	public static class DummySingletonService extends
+		AbstractSingletonService<DummyPlugin>
+	{
+
+		@Override
+		public Class<DummyPlugin> getPluginType() {
+			return DummyPlugin.class;
+		}
+	}
+
+	@Plugin(type = DummyPlugin2.class)
+	public static class DummyPlugin2 extends AbstractRichPlugin implements
+		SingletonPlugin
+	{
+		// NB: No implementation needed.
+	}
+
+	public static class DummySingletonService2 extends
+		AbstractSingletonService<DummyPlugin2>
+	{
+
+		@Override
+		public Class<DummyPlugin2> getPluginType() {
+			return DummyPlugin2.class;
+		}
+	}
+
+}