Add abstract base class for ScriptLanguage tests

This can be used by adding the following snippet to the downstream POM:

  <dependency>
    <groupId>org.scijava</groupId>
    <artifactId>scijava-common</artifactId>
    <classifier>tests</classifier>
  </dependency>

Along with the following test method:

  @test
  public void testDiscovery() {
    assertDiscovered(FooScriptLanguage.class);
  }

Author: ctrueden

pom.xml

@@ -10,7 +10,7 @@
 	</parent>
 
 	<artifactId>scijava-common</artifactId>
-	<version>2.42.3-SNAPSHOT</version>
+	<version>2.43.0-SNAPSHOT</version>
 
 	<name>SciJava Common</name>
 	<description>SciJava Common is a shared library for SciJava software. It provides a plugin framework, with an extensible mechanism for service discovery, backed by its own annotation processor, so that plugins can be loaded dynamically. It is used by both ImageJ and SCIFIO.</description>

src/test/java/org/scijava/script/AbstractScriptLanguageTest.java

@@ -0,0 +1,68 @@
+/*
+ * #%L
+ * SciJava Common shared library for SciJava software.
+ * %%
+ * Copyright (C) 2009 - 2015 Board of Regents of the University of
+ * Wisconsin-Madison, Broad Institute of MIT and Harvard, and Max Planck
+ * Institute of Molecular Cell Biology and Genetics.
+ * %%
+ * 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.script;
+
+import static org.junit.Assert.fail;
+
+import javax.script.ScriptEngineFactory;
+import javax.script.ScriptEngineManager;
+
+/**
+ * Abstract base class for {@link ScriptLanguage} implementation unit tests.
+ *
+ * @author Curtis Rueden
+ */
+public class AbstractScriptLanguageTest {
+
+	/**
+	 * Checks that the JSR-223 framework can successfully discover the given
+	 * {@link ScriptLanguage} implementation.
+	 */
+	protected void assertDiscovered(
+		final Class<? extends ScriptLanguage> scriptLanguage)
+	{
+		final ScriptEngineManager manager = new ScriptEngineManager();
+
+		// assert that manager has the script language on its factory list
+		boolean match = false;
+		for (final ScriptEngineFactory factory : manager.getEngineFactories()) {
+			if (scriptLanguage.isInstance(factory)) {
+				match = true;
+				break;
+			}
+		}
+		if (!match) {
+			fail(scriptLanguage.getName() + " not discovered by JSR-223 framework");
+		}
+	}
+
+}