From 0bf22dca1a550761b5e0bd8a1458cd78414e4959 Mon Sep 17 00:00:00 2001
From: Paul Gascou-Vaillancourt <paul.gascvail@gmail.com>
Date: Wed, 12 Jun 2019 11:34:20 -0400
Subject: Add watch option to test script

---
 scripts/frontend/test.js | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/scripts/frontend/test.js b/scripts/frontend/test.js
index dab7176f8c1..5dab97648ed 100755
--- a/scripts/frontend/test.js
+++ b/scripts/frontend/test.js
@@ -16,8 +16,14 @@ program
   .version('0.1.0')
   .usage('[options] <file ...>')
   .option('-p, --parallel', 'Run tests suites in parallel')
+  .option(
+    '-w, --watch',
+    'Rerun tests when files change (tests will be run in parallel if this enabled)',
+  )
   .parse(process.argv);
 
+const shouldParalleslize = program.parallel || program.watch;
+
 const isSuccess = code => code === SUCCESS_CODE;
 
 const combineExitCodes = codes => {
@@ -31,7 +37,7 @@ const skipIfFail = fn => code => (isSuccess(code) ? fn() : code);
 const endWithEOL = str => (str[str.length - 1] === '\n' ? str : `${str}${EOL}`);
 
 const runTests = paths => {
-  if (program.parallel) {
+  if (shouldParalleslize) {
     return Promise.all([runJest(paths), runKarma(paths)]).then(combineExitCodes);
   } else {
     return runJest(paths).then(skipIfFail(() => runKarma(paths)));
@@ -96,6 +102,10 @@ const toKarmaArgs = paths =>
   paths.reduce((acc, path) => acc.concat('-f', replacePathForKarma(path)), []);
 
 const main = paths => {
+  if (program.watch) {
+    JEST_ARGS.push('--watch');
+    KARMA_ARGS.push('--single-run', 'false', '--auto-watch');
+  }
   runTests(paths).then(code => {
     console.log('~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~');
     if (isSuccess(code)) {
-- 
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