Create a unified script to run Jest & Karma tests

- Created scripts/frontend/test.js
- Updated test task to call Node script

package.json

@@ -19,7 +19,7 @@
     "stylelint": "node node_modules/stylelint/bin/stylelint.js app/assets/stylesheets/**/*.*  ee/app/assets/stylesheets/**/*.* !**/vendors/** --custom-formatter node_modules/stylelint-error-string-formatter",
     "stylelint-file": "node node_modules/stylelint/bin/stylelint.js",
     "stylelint-create-utility-map": "node scripts/frontend/stylelint/stylelint-utility-map.js",
-    "test": "yarn jest && yarn karma",
+    "test": "node scripts/frontend/test",
     "webpack": "NODE_OPTIONS=\"--max-old-space-size=3584\" webpack --config config/webpack.config.js",
     "webpack-prod": "NODE_OPTIONS=\"--max-old-space-size=3584\" NODE_ENV=production webpack --config config/webpack.config.js"
   },

scripts/frontend/test.js

+#!/usr/bin/env node
+
+const program = require('commander');
+const { spawn } = require('child_process');
+
+const JEST_ROUTE = 'spec/frontend';
+const KARMA_ROUTE = 'spec/javascripts';
+const COMMON_ARGS = ['--colors'];
+
+program
+  .version('0.1.0')
+  .usage('[options] <file ...>')
+  .option('-p, --parallel', 'Run tests suites in parallel')
+  .parse(process.argv);
+
+const runTests = paths => {
+  if (program.parallel) {
+    return Promise.all([runJest(paths), runKarma(paths)]);
+  } else {
+    return runJest(paths).then(() => runKarma(paths));
+  }
+};
+
+const spawnPromise = (cmd, args) => {
+  return new Promise((resolve, reject) => {
+    const proc = spawn('yarn', ['run', cmd, ...args]);
+    const output = data => `${cmd}: ${data}`;
+
+    proc.stdout.on('data', data => {
+      process.stdout.write(output(data));
+    });
+
+    proc.stderr.on('data', data => {
+      process.stderr.write(output(data));
+    });
+
+    proc.on('close', code => {
+      process.stdout.write(`${cmd} exited with code ${code}`);
+      if (code === 0) {
+        resolve();
+      } else {
+        reject();
+      }
+    });
+  });
+};
+
+const runJest = args => {
+  return spawnPromise('jest', [...COMMON_ARGS, ...toJestArgs(args)]);
+};
+
+const runKarma = args => {
+  return spawnPromise('karma', [...COMMON_ARGS, ...toKarmaArgs(args)]);
+};
+
+const replacePath = to => path =>
+  path
+    .replace(JEST_ROUTE, to)
+    .replace(KARMA_ROUTE, to)
+    .replace('app/assets/javascripts', to);
+
+const toJestArgs = paths => paths.map(replacePath(JEST_ROUTE));
+
+const toKarmaArgs = paths =>
+  paths.map(replacePath(KARMA_ROUTE)).reduce((acc, current) => acc.concat('-f', current), []);
+
+const main = paths => {
+  runTests(paths)
+    .then(() => {
+      console.log('All tests passed!');
+    })
+    .catch(() => {
+      console.log('Some tests failed...');
+    });
+};
+
+main(program.args);