Bug with phpunit Laravel 4

PostController.php

	public function showPost($post = null)
	{
		$view = View::make('blog.post');
		$view->with('title', "Aran Wilkinson - "); // We need to get the post title

		$view->with('post', $this->posts->getPostBySlug($post));
		// 
		// Get the requested blog post 
		// If it doesn't exist give 404 error
		// 

		return $view;
	}

PostTest.php

<?php

class PostTest extends TestCase {

	/**
	 * Tear down the testing environment
	 *
	 * @return void
	 **/
	public function tearDown()
	{
		Mockery::close();
	}

	/**
	 * Test Post Repository
	 *
	 * @return void
	 **/
	public function testGetLatestPosts()
	{
		$mockRepository = Mockery::mock('PostRepository');

		$mockRepository->shouldReceive('getLatestPosts')->once()->andReturn('foo');

		$this->app->instance('PostRepository', $mockRepository);

		$response = $this->call('GET', '/blog');

		$view = $response->getOriginalContent();

		$this->assertTrue($response->isOk());

		$this->assertEquals('foo', $view['posts']);
	}

	/**
	 * Test Single Post
	 *
	 * @return void
	 **/
	public function testPostBySlug()
	{
		$mockRepository = Mockery::mock('PostRepository');

		$mockRepository->shouldReceive('getPostBySlug')->with("mockery")->once()->andReturn('foobar');

		$this->app->instance('PostRepository', $mockRepository);

		$response = $this->call('GET', '/blog/mockery');

		$view = $response->getOriginalContent();

		$this->assertTrue($response->isOk());

		$this->assertEquals('foobar', $view['post']);
	}


}

routes.php

Route::get('/blog/{slug}', 'PostController@showPost');

TestCase.php

<?php

class TestCase extends Illuminate\Foundation\Testing\TestCase {

    /**
     * Creates the application.
     *
     * @return Symfony\Component\HttpKernel\HttpKernelInterface
     */
    public function createApplication()
    {
    	$unitTesting = true;

        $testEnvironment = 'testing';

    	return require __DIR__.'/../../start.php';
    }

}