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diff --git a/tests/phpunit/includes/TestUserRegistry.php b/tests/phpunit/includes/TestUserRegistry.php
index 4818b49a34..0c178ca128 100644
--- a/tests/phpunit/includes/TestUserRegistry.php
+++ b/tests/phpunit/includes/TestUserRegistry.php
@@ -107,4 +107,19 @@ class TestUserRegistry {
 	public static function clear() {
 		self::$testUsers = [];
 	}
+
+	/**
+	 * @todo It would be nice if this were a non-static method of TestUser
+	 * instead, but that doesn't seem possible without friends?
+	 *
+	 * @return bool True if it's safe to modify the user
+	 */
+	public static function isMutable( User $user ) {
+		foreach ( self::$testUsers as $key => $testUser ) {
+			if ( $user === $testUser->getUser() ) {
+				return false;
+			}
+		}
+		return true;
+	}
 }