Fix failing test between PHP 7.4.0 and PHP 7.4.7

Author: clue

tests/FunctionalFactoryTest.php

@@ -61,7 +61,9 @@ public function testOpenReturnsPromiseWhichRejectsWithExceptionWhenPathIsInvalid
             echo 'Error: ' . $e->getMessage() . PHP_EOL;
         });
 
-        $this->expectOutputString('Error: Unable to open database: unable to open database file' . PHP_EOL);
+        // Unable to open database: unable to open database file
+        // Unable to open database: bad parameter or other API misuse (only between PHP 7.4.0 and PHP 7.4.7 as per https://3v4l.org/9SjgK)
+        $this->expectOutputRegex('/^' . preg_quote('Error: Unable to open database: ', '/') . '.*$/');
         Loop::run();
     }