How to set up a user inside unit tests

I want to test some methods in my plugin, and some of them required user to be logged in.

I searched everywhere but found nothing of use.

I need to test a method that takes in logged in session token from a user. For that, I need to mock logged user and then get his token using wp_get_session_token.

But I’m not sure how to do that.

<?php
class Test_Class extends WP_UnitTestCase {

  /**
   * Checks the error for invalid user token
   *
   * @since 1.1.0
   */
  public function test_add_app() {

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

    wp_set_current_user( 1 );
    $auth_token  = wp_get_session_token();
    $auth_cookie = wp_parse_auth_cookie();

    // I'm checking for validity here but the token seems to be empty
    // so the test fails every time.
  }
}

I’ve read that I can mock data with the factory provided by WP_UnitTestCase, but I’m not sure what I’m doing wrong.

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 );