[wp-trac] [WordPress Trac] #36170: Small refactor in the validate_file method + unit tests

[WordPress Trac]

#36170: Small refactor in the validate_file method + unit tests
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 Reporter:  borgesbruno  |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  General      |    Version:
 Severity:  normal       |   Keywords:
  Focuses:               |
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 The {{{ validate_file( $file, $allowed_files = '' ) }}} method has as
 third param an array of allowed files, but the default value is a string,
 I created this patch using as default value an empty array instead of a
 empty string.

 Beyond that, I wrote some unit tests for this change and to improve de
 code coverage.

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Ticket URL: <https://core.trac.wordpress.org/ticket/36170>
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