chore: Minor error msg change in testing/bootstrap.php (#1440)
chore: Minor error msg change in testing/bootstrap.php (#1440)


GoogleCloudPlatform/php-docs-samples,GoogleCloudPlatform/php-docs-samples,GoogleCloudPlatform/php-docs-samples,GoogleCloudPlatform/php-docs-samples,GoogleCloudPlatform/php-docs-samples