Modification in phpdoc and unit tests for wp_dropdown_languages()

[realloc]

I wrote a unit test for wp_dropdown_languages(). I added also a filter when this test is running so there will be no call to the API. I changed the php documentation too because this function returns always the generated output even when the param echo is set to true.

[realloc]

PhpDoc and unit test for wp_dropdown_languages()

[johnbillion]

In 36290:

I18N: Correct an argument description and return value for wp_dropdown_languages().

Props realloc
See #35294

[johnbillion]

These assertions are good, but they are brittle because they test the output of the function in its entirety. I think it would be better to test various pieces of the output (using assertContains() or assertRegExp()) to ensure they are as expected.

For example, what is actually being tested here is that the correct languages are output in the correct optgroup, and the expected attributes are present.

@realloc Do you want to take another look at this?

[realloc]

Replying to johnbillion:

@realloc Do you want to take another look at this?

Thanks for your tips, John! I'll have a look at it very soon.

[chriscct7]

@realloc Did you have an updated patch for this?

[realloc]

Replying to chriscct7:

@realloc Did you have an updated patch for this?

Not yet, but I will work on this on monday.

[realloc]

Test the various pieces of the output only

[ocean90]

In 36631:

L10n: Add test for wp_dropdown_languages().

Props realloc.
Fixes #35294.