Mocking a service class inside controller - laravel

Question

I am trying to write a Feature test for my controller. To simplify my current situation, imagine my controller looks like this:
public function store(Business $business)
{
try {
(new CreateApplicationAction())->execute($business);
} catch (Exception $e) {
return response()->json(['message' => 'error'], 500);
}
return response()->json(['message' => 'success']);
}
What I am trying to achieve is, instead of testing CreateApplication class logic inside my integration test, I want to write another unit test for it specifically.
Is there a way I can simply say CreateApplicationAction expects execute() and bypass testing inside it? (without executing the code inside execute())
/** #test */
public function can_create_application()
{
$business = Business:factory()->create();
$mock = $this->mock(CreateApplicationAction::class, function (MockInterface $mock) use ($business) {
$mock->shouldReceive('execute')
->once()
->with($business)
->andReturn(true);
});
$response = $this->post('/businesses/3/application', $data);
$response->assertOk();
}
I saw online that people create "MockCreateApplicationAction" class but if possible I don't want to create another class as I don't want any logic to be inside it at all.
Is it possible?
class CreateApplicationAction
{
public function execute($business) {
dd("A");
// Business Logic...
}
}
So when I do the Mock, dd() should never be called. Or I am going in the wrong direction?

Answer 1

You will need to use Laravels container to resolve your class. The basic approach is to use the resolve() method helper. PHP does not have dependency injection, so you need to use one to make it possible, in Laravel the container solves that.
resolve(CreateApplicationAction::class)->execute($business);
On constructors, controller methods, jobs, events, listeners and commands (rule of thumb if the method is named handle), you can inject classes into the parameters and they will resolve through the container.
public function store(Business $business, CreateApplicationAction $applicationAction)
{
try {
$applicationAction->execute($business);