PHPUnit Laravel : How to Unit Test custom Exception Handler?

Question

I try to make unit test of a custom Exception Handler class (located in app/Exceptions/Handler.php), but i don't know how to do it ...

I don't know how to raise an exception with my mock Request.

Is someone can help me ?

Here is the "render" method :

/**
 * @param \Illuminate\Http\Request $request
 * @param Exception $e
 * @return \Illuminate\Http\RedirectResponse|\Symfony\Component\HttpFoundation\Response
 */
public function render($request, Exception $e)
{
    // This will replace our 404 response with
    // a JSON response.
    if ($e instanceof ModelNotFoundException &&
        $request->wantsJson()) {
        Log::error('render ModelNotFoundException');
        return response()->json([
            'error' => 'Resource not found'
        ], 404);
    }
    if ($e instanceof TokenMismatchException) {
        Log::error('render TokenMismatchException');
        return new RedirectResponse('login');
    }
    if ($e instanceof QueryException) {
        Log::error('render QueryException', ['exception' => $e]);
        return response()->view('errors.500', ['exception' => $e, 'QueryException' => true],500);
    }

    return parent::render($request, $e);
}

And this is my test case :

/**
 * @test
 */
public function renderTokenMismatchException()
{
    $request = $this->createMock(Request::class);
    $request->expects($this->once())->willThrowException(new TokenMismatchException);
    $instance = new Handler($this->createMock(Application::class));
    $class    = new \ReflectionClass(Handler::class);
    $method   = $class->getMethod('render');
    $method->setAccessible(true);
    $expectedInstance = Response::class;
    $this->assertInstanceOf($expectedInstance, $method->invokeArgs($instance, [$request, $this->createMock(Exception::class)]));
}

Any reason you don't call the route that will throw the exception directly? — TheAlexLichter
– TheAlexLichter, Commented Oct 27, 2017 at 10:11

benjy80 · Accepted Answer · 2017-11-08 16:35:01Z

3

This how i do it :

/**
 * @test
 */
public function renderTokenMismatch()
{
    $request = $this->createMock(Request::class);
    $instance = new Handler($this->createMock(Container::class));
    $class    = new \ReflectionClass(Handler::class);
    $method   = $class->getMethod('render');
    $method->setAccessible(true);
    $expectedInstance = RedirectResponse::class;
    $this->assertInstanceOf($expectedInstance, $method->invokeArgs($instance, [$request, $this->createMock(TokenMismatchException::class)]));
}

answered Nov 8, 2017 at 16:35

benjy80

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2 Comments

digout Over a year ago

Error : Call to undefined method Mock_Request_e1709ead::wantsJson()

Sandra Over a year ago

the answer above does: * instantiate Handler with mocked Container; * make render accessible via reflection; * call method on the handler instance, using mocked request and exception. if you're running into issues with undefined methods you can use a partial mock or mock the expected methods. also: extend the base Laravel TestCase if you're using translations

Nahuelsgk · Accepted Answer · 2020-02-14 15:35:00Z

0

It's not easier do something like

$request = $this->createMock(Request::class);
$handler = new Handler($this->createMock(Container::class));
$this->assertInstanceOf(
     RedirectResponse::class,
     $handler->render(
           $request,
           $this->createMock(TokenMismatchException::class)
       )
    );

answered Feb 14, 2020 at 15:35

Nahuelsgk

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