updates start-vault script to launch headless firefox for local testing (#29945)

ui/package.json

@@ -37,6 +37,7 @@
     "test:quick": "node scripts/start-vault.js --split=8 --preserve-test-name --parallel",
     "test:quick-oss": "node scripts/start-vault.js -f='!enterprise' --split=8 --preserve-test-name --parallel",
     "test:filter": "node scripts/start-vault.js --server -f='!enterprise'",
+    "test:dev": "node scripts/start-vault.js",
     "vault": "VAULT_REDIRECT_ADDR=http://127.0.0.1:8200 vault server -log-level=error -dev -dev-root-token-id=root -dev-ha -dev-transactional",
     "vault:cluster": "VAULT_REDIRECT_ADDR=http://127.0.0.1:8202 vault server -log-level=error -dev -dev-root-token-id=root -dev-listen-address=127.0.0.1:8202 -dev-ha -dev-transactional"
   },

ui/scripts/start-vault.js

@@ -69,9 +69,15 @@ async function processLines(input, eachLine = () => {}) {
       }
     });
     try {
-      // only the test:filter command specifies --server by default
+      // ignore first 2 args (node and path) and extract flags to pass to test/exam command
-      const verb = process.argv[2] === '--server' ? 'test' : 'exam';
+      const args = process.argv.slice(2);
-      await testHelper.run('ember', [verb, ...process.argv.slice(2)]);
+      const withServer = args.includes('--server') || args.includes('-s');
+      // current issue with headless Chrome where an event listener in Hds::Modal is not triggered resulting in a pending test waiter and timeout
+      // the workaround for now is to run the tests in headless firefox for local runs
+      if (!withServer && !process.env.CI) {
+        args.push('--launch=Firefox');
+      }
+      await testHelper.run('ember', ['exam', ...args]);
     } catch (error) {
       console.log(error);
       process.exit(1);

ui/testem.js

@@ -25,6 +25,9 @@ module.exports = {
         '--window-size=1440,900',
       ].filter(Boolean),
     },
+    Firefox: {
+      ci: ['--headless'],
+    },
   },
   proxies: {
     '/v1': {