Support for Types Inclusion in expectFilter

[badasswp]

Feature request

At the moment, the expectFilter expects a precise value to be passed as part of its argument. Can we also provide support for the use of types within our params like so:

\WP_Mock::expectFilter( 'my_filter', \WP_Mock\Functions::type( 'string' ) );

OR

\WP_Mock::expectFilter( 'my_filter', \WP_Mock\Functions::type( MyClass::class ) );

Proposed solution

I would like to see a situation where we are able to pass in types. This could cater for scenarios where we DO NOT have precise values, but we expect the instance of a Class to be passed in like so:

public function get_provider(): Provider {
    $tag_provider = get_option( 'tag_provider', [] )['name'] ?? '';

    switch ( $tag_provider ) {
	case 'WP_Tags':
	    $tag_provider = new TagProvider();
	    break;
    }

    /**
     * Filter Tag Provider.
     *
     * @param Provider $tag_provider Tag Provider.
     * @return Provider
     */
    return apply_filters( 'tag_provider', $tag_provider );
}

We should be able to do this within our test cases:

\WP_Mock::expectFilter( 'tag_provider', \WP_Mock\Functions::type( TagProvider::class ) );