[5.5] Add assertJsonMissingExact method to TestResponse.php

[Gimcrack]

As it is currently written, the assertJsonMissing method will fail if any portion of the Json fragment is found in the response. Consider this example.

// response
[
    [
        'name' => 'John Doe',
        'created_at' => '2017-10-30'
    ],
];

Now we want to make sure that the response doesn't include a record for Jane Doe.

$this->assertJsonMissing( [
    'name' => 'Jane Doe',
    'created_at' => '2017-10-30'
]);

It is obviously not the same record, but the test will fail because the created_at values are the same.

Found unexpected JSON fragment: 

["created_at":"2017-10-30"]

within
...

[taylorotwell]

I don't understand your comment. The two dates are the same?

[Gimcrack]

@taylorotwell In this example, I want to test that the Jane Doe record is not in the response. It's obviously not, but the test fails because the two records have the same value for created_at. The test fails if any of the unexpected attributes are found in the response, but I want it to fail if all of the unexpected attributes are found in the response.

I can see use cases for the method as-is, so I added a new method to test that the exact Json fragment is missing.

I hope this clears it up. Cheers.

[taylorotwell]

I see. Thanks.