one last try

Author: bshaffer

tests/Credentials/ExternalAccountCredentialsTest.php

@@ -597,6 +597,10 @@ public function testExecutableCredentialSourceEnvironmentVars()
             'id_token' => 'abc',
             'expiration_time' => time() + 100,
         ]);
+
+        if (PHP_OS_FAMILY === 'Windows') {
+            $successJson = str_replace('"', '\"', $successJson);
+        }
         $command = sprintf(
             'echo $GOOGLE_EXTERNAL_ACCOUNT_AUDIENCE,$GOOGLE_EXTERNAL_ACCOUNT_TOKEN_TYPE,%s > %s' .
             ' && echo \'%s\' > $GOOGLE_EXTERNAL_ACCOUNT_OUTPUT_FILE' .