diff --git a/html/modules/custom/reliefweb_entities/tests/src/ExistingSite/RwReportBase.php b/html/modules/custom/reliefweb_entities/tests/src/ExistingSite/RwReportBase.php
index 905bdb5e7..f16ebb8d9 100644
--- a/html/modules/custom/reliefweb_entities/tests/src/ExistingSite/RwReportBase.php
+++ b/html/modules/custom/reliefweb_entities/tests/src/ExistingSite/RwReportBase.php
@@ -4,6 +4,7 @@
 
 namespace Drupal\Tests\reliefweb_entities\ExistingSite;
 
+use Drupal\Core\Session\AccountInterface;
 use Drupal\node\Entity\Node;
 use Drupal\taxonomy\Entity\Term;
 use Drupal\user\Entity\User;
@@ -51,4 +52,58 @@ protected function createUserIfNeeded($id, $name, array $extra = []) : User {
     return $user;
   }
 
+  /**
+   * Logs in a user using the Mink controlled browser.
+   *
+   * If a user is already logged in, then the current user is logged out before
+   * logging in the specified user.
+   *
+   * Note that neither the current user nor the passed-in user object is
+   * populated with data of the logged in user. If you need full access to the
+   * user object after logging in, it must be updated manually. If you also need
+   * access to the plain-text password of the user (set by drupalCreateUser()),
+   * e.g. to log in the same user again, then it must be re-assigned manually.
+   * For example:
+   * @code
+   *   // Create a user.
+   *   $account = $this->drupalCreateUser([]);
+   *   $this->drupalLogin($account);
+   *   // Load real user object.
+   *   $pass_raw = $account->passRaw;
+   *   $account = User::load($account->id());
+   *   $account->passRaw = $pass_raw;
+   * @endcode
+   *
+   * @param \Drupal\Core\Session\AccountInterface $account
+   *   User object representing the user to log in.
+   *
+   * @see drupalCreateUser()
+   */
+  protected function drupalLogin(AccountInterface $account) {
+    if ($this->loggedInUser) {
+      $this->drupalLogout();
+    }
+
+    if ($this->useOneTimeLoginLinks) {
+      // Reload to get latest login timestamp.
+      $storage = \Drupal::entityTypeManager()->getStorage('user');
+      /** @var \Drupal\user\UserInterface $accountUnchanged */
+      $accountUnchanged = $storage->loadUnchanged($account->id());
+      $login = user_pass_reset_url($accountUnchanged) . '/login?destination=user/' . $account->id();
+      $this->drupalGet($login);
+    }
+    else {
+      $this->drupalGet(Url::fromRoute('user.login'));
+      $this->submitForm([
+        'name' => $account->getAccountName(),
+        'pass' => $account->passRaw,
+      ], 'Log in');
+    }
+
+    // @see ::drupalUserIsLoggedIn()
+    $account->sessionId = $this->getSession()->getCookie(\Drupal::service('session_configuration')->getOptions(\Drupal::request())['name']);
+
+    $this->loggedInUser = $account;
+    $this->container->get('current_user')->setAccount($account);
+  }
 }