JavaScriptTest: be more lenient with return values

The Nashorn script engine, as well as the stock Mozilla Rhino
implementation (the one not shipped as part of Java 6), both return
Integer instead of Double when you write "return 4;" and similar.

Author: ctrueden

src/test/java/org/scijava/plugins/scripting/javascript/JavaScriptTest.java

@@ -122,8 +122,10 @@ public void testLoad() throws IOException, InterruptedException, ExecutionExcept
 		final Context context = new Context(ScriptService.class);
 		final ScriptService scriptService = context.getService(ScriptService.class);
 		final String script = "load('" + tmp.getPath() + "'); three();";
-		final Object result = scriptService.run("three.js", script, false).get().getReturnValue();
-		assertEquals(4.0, (Number) result);
+		// NB: Some JVMs return Integer, others Double. Let's be careful here.
+		final ScriptModule m = scriptService.run("three.js", script, false).get();
+		final Number result = (Number) m.getReturnValue();
+		assertEquals(4.0, result.doubleValue(), 0.0);
 		assertTrue(tmp.delete());
 	}
 }