PHPUnit Laravel : How to Unit Test custom Exception Handler? - php

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)]));
}

Answer 1

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)]));
}

Answer 2

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)
)
);