feat(travis/tests): run tests on files that differs from master (#3599)

Fixes #2703

.travis.yml

@@ -21,5 +21,4 @@ cache:
   yarn: true
 
 script:
-  - yarn run test
-  - yarn run test-integration
+  - yarn run travis-tests

package.json

@@ -58,7 +58,8 @@
     "prepare": "scripts/run-script prepare",
     "pretest": "eslint --ignore-path .gitignore .",
     "test": "jest \"^(?!.*\\.integ\\.spec\\.js$)\"",
-    "test-integration": "jest \".integ\\.spec\\.js$\""
+    "test-integration": "jest \".integ\\.spec\\.js$\"",
+    "travis-tests": "scripts/travis-tests"
   },
   "workspaces": [
     "@xen-orchestra/*",

scripts/travis-tests

@@ -0,0 +1,45 @@
+#!/usr/bin/env node
+
+const { execFileSync, spawnSync } = require('child_process')
+
+const run = (command, args) => {
+  const { status } = spawnSync(command, args, { stdio: 'inherit' })
+  if (status !== 0) {
+    process.exit(status)
+  }
+}
+
+const getFiles = () =>
+  execFileSync(
+    'git',
+    [
+      'diff-index',
+      '--diff-filter=AM',
+      '--ignore-submodules',
+      '--name-only',
+      'master',
+    ],
+    { encoding: 'utf8' }
+  )
+    .split('\n')
+    .filter(_ => _ !== '')
+
+// -----------------------------------------------------------------------------
+
+// Travis vars : https://docs.travis-ci.com/user/environment-variables#default-environment-variables.
+if (process.env.TRAVIS_PULL_REQUEST !== 'false') {
+  const files = getFiles().filter(_ => _.endsWith('.js'))
+  if (files.length !== 0) {
+    run(
+      './node_modules/.bin/jest',
+      [
+        '--testRegex=^(?!.*.integ.spec.js$).*.spec.js$',
+        '--findRelatedTests',
+        '--passWithNoTests',
+      ].concat(files)
+    )
+  }
+} else {
+  run('yarn', ['test'])
+  run('yarn', ['test-integration'])
+}