PHPUnit | assertInstanceOf() Function

The assertInstanceOf() is a built in PHP function to test your php based features before deploying the application on your live application.assertNotInstanceOf() function is the inverse of this assertion and takes the same arguments.

Syntax:

assertInstanceOf($expected, $actual[, $message = ''])

Reports an error identified by $message if $actual is not an instance of $expected.

Example: Usage of assertInstanceOf() function.

Reference: https://phpunit.readthedocs.io/en/8.4/assertions.html#assertinstanceof

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