How to set up a user inside unit tests

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Just few notes:

Looks like you’re doing functional/integration tests rather than unit tests in isolation.

Here you’re creating a user, but not setting it as the current one:

$user = $this->factory->user->create();
wp_set_current_user( 1 );

You probably want:

$user_id = $this->factory->user->create();
wp_set_current_user( $user_id );

Note that cookies aren’t set here, because of:

tests_add_filter( 'send_auth_cookies', '__return_false' );

If you use e.g.

add_filter( 'send_auth_cookies', '__return_true' );

then you will get an error when setcookie() is called from wp_set_auth_cookie():

Cannot modify header information - headers already sent by (

The wp_get_session_token() is a wrapper of wp_parse_auth_cookie().

Parsing a cookie with wp_parse_auth_cookie assumes $_COOKIE is set.

Wonder if a fake token string would work in your tests?

Else one could try:

$expiration = time() + DAY_IN_SECONDS;
$manager    = WP_Session_Tokens::get_instance( $user_id );
$token      = $manager->create( $expiration );

with a verification:

$this->manager->verify( $token );

and then a cleanup:

$this->manager->destroy( $token );

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