Quite silly.

Author: peterwilsoncc

tools/local-env/scripts/install.js

@@ -41,7 +41,7 @@ writeFileSync( 'wp-tests-config.php', testConfig );
 // Once the site is available, install WordPress!
 wait_on( {
 	resources: [
-		`tcp:localhost:${process.env.LOCAL_PORT}`
+		`tcp:localhost:${process.env.LOCAL_PORT}`,
 		`tcp:mysql:3306`
 	],
 	timeout: 3000,