Add unit tests.

tests/suite/joomla/application/component/JControllerTest.php

@@ -195,7 +195,49 @@ public function testExecute()
 	public function testGetInstance()
 	{
 		// Remove the following lines when you implement this test.
-		$this->markTestIncomplete('This test has not been implemented yet.');
+		$controller = $this->getMock('JController', null, array(), '', false);
+		$className = get_class($controller);
+		$_SERVER['REQUEST_METHOD'] = 'get';
+		JRequest::setVar('format', 'json');
+		try
+		{
+			$className::getInstance('MyPrefix', array('base_path' => __DIR__ . '/_data/component1'));
+		}
+		catch (Exception $e)
+		{
+			$this->assertEquals(
+				$e->getMessage(),
+				'JLIB_APPLICATION_ERROR_INVALID_CONTROLLER_CLASS',
+				'Line:'.__LINE__.' File _data/component1/controller.json.php must be found.'				
+			);
+		}
+		JRequest::setVar('format', 'xml');
+		try
+		{
+			$className::getInstance('MyPrefix', array('base_path' => __DIR__ . '/_data/component1'));
+		}
+		catch (Exception $e)
+		{
+			$this->assertEquals(
+				$e->getMessage(),
+				'JLIB_APPLICATION_ERROR_INVALID_CONTROLLER',
+				'Line:'.__LINE__.' File _data/component1/controller.xml.php and _data/component1/controller.php must not be found.'				
+			);
+		}
+		JRequest::setVar('format', 'xml');
+		try
+		{
+			$className::getInstance('MyPrefix', array('base_path' => __DIR__ . '/_data/component2'));
+		}
+		catch (Exception $e)
+		{
+			$this->assertEquals(
+				$e->getMessage(),
+				'JLIB_APPLICATION_ERROR_INVALID_CONTROLLER_CLASS',
+				'Line:'.__LINE__.' File _data/component2/controller.php must be found.'				
+			);
+		}
+		$this->markTestIncomplete('This test is not been complete yet.');
 	}
 
 	/**