[5.6] Fix assertRedirect

[adaroobi]

This is a follow to #23170 :

assertRedirect doesn't behave correctly when asserting redirect routes since it retains the headers format while converting the given URI to URL if necessary.

but this retains the original tests.
However assertRedirect is operating an equal behavior to original tests and even better by asserting any redirect type, not just 301 one. Plus, accepting both urls and uris equally.

[Miguel-Serejo]

even better by asserting any redirect type, not just 301 one

Redirect routes are supposed to return a 301 code. Any other code would be an error.

[adaroobi]

@36864 Sorry but, I disagree with you since 3xx codes are all redirect codes, and for example, default code for Illuminate\Routing\Redirector::to() method is 302.

[Miguel-Serejo]

Apologies, I should have been more explicit.

The tests are explicitly passing the status code 301 into the Route::redirect method. In this case, any status code other than the supplied status code should be considered an error.

[adaroobi]

@36864 No problem. Yes, exactly you're right.