added small test for IsolatedScriptingContainer simulating an OSGi co…

…ntainer

core/src/test/java/org/jruby/embed/IsolatedScriptingContainerTest.java

@@ -0,0 +1,48 @@
+package org.jruby.embed;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.fail;
+
+import java.net.URL;
+import java.net.URLClassLoader;
+
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+public class IsolatedScriptingContainerTest {
+
+    static ClassLoader cl;
+
+    @BeforeClass
+    public static void setupClassLoader() {
+        cl = Thread.currentThread().getContextClassLoader();
+        // make sure we have classloader which does not find jruby
+        ClassLoader c = new URLClassLoader( new URL[] {}, null );
+        try {
+          c.loadClass( "org.jruby.embed.ScriptingContainer" );
+          fail( "this classloader shall not find jruby" );
+        }
+        catch( ClassNotFoundException expected){}
+        // set it as context classloader
+        Thread.currentThread().setContextClassLoader( c );
+    }
+
+    @AfterClass
+    public static void restClassLoader() {
+        Thread.currentThread().setContextClassLoader( cl );
+    }
+
+    @Test
+    public void testIsolatedScriptingContainer() throws Exception {
+        // we do have an instance of "jruby" loaded via some other classloader
+    	//System.setProperty("jruby.debug.loadService", "true");
+        ScriptingContainer instance = new IsolatedScriptingContainer();
+        String result = instance.runScriptlet( "$LOAD_PATH" ).toString();
+        assertNotNull(result);
+
+        assertEquals(instance.runScriptlet("JRuby.runtime.jruby_class_loader.parent" ), cl );
+        assertEquals(ScriptingContainer.class.getClassLoader(), cl);
+    }
+}

core/src/test/resources/rubygems/defaults/jruby.rb

@@ -0,0 +1,9 @@
+# dummy to run IsolatedScriptingContainerTest
+module Gem
+  class Specification
+     def self.reset
+     end
+     def self.add_dir *args
+     end
+   end
+end