How to test for JSON responses in PHPUnit?

@lew 

In PHPUnit, you can test JSON responses by asserting that the actual response is valid JSON and contains the expected data.

Here is an example of how to test a JSON response using PHPUnit:

1. Make the request to the API or endpoint as you normally would in PHPUnit.

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$response = $this->get('/api/some-endpoint');

1. Get the content of the response.

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$content = $response->getContent();

1. Use PHPUnit's assertJson() method to check that the content is valid JSON.

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$this->assertJson($content);

1. Use PHPUnit's assertJsonStringEqualsJsonString() or assertJsonStringContainsJsonString() methods to check the expected JSON structure or data.

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$expectedJson = '{"status":"ok"}';
$this->assertJsonStringEqualsJsonString($expectedJson, $content);

or

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$expectedJsonPart = '{"status":"ok"}';
$this->assertJsonStringContainsJsonString($expectedJsonPart, $content);