Ticket #57394: unit-test-57394.diff

tests/phpunit/tests/user.php

@@ -934 +934 @@
                 $this->assertSame( $expected, $user->user_nicename );
         }
 
+        /**
+         * @ticket 57394
+         */
+        public function test_wp_insert_user_should_reject_username_that_matches_existing_user_email() {
+
+                $existing_email = get_option( 'admin_email' );
+
+                $u              = wp_insert_user(
+                        array(
+                                'user_login'    => $existing_email,
+                                'user_email'    => 'whatever@example.com',
+                                'user_pass'     => 'whatever',
+                                'user_nicename' => 'whatever',
+                        )
+                );
+
+                $this->assertWPError( $u );
+                $this->assertSame( 'existing_user_login_as_email', $u->get_error_code() );
+        }
+
         /**
          * @ticket 33793
          */