parallelize Travis using build matrix & test subsuites

.travis.yml

@@ -4,11 +4,11 @@ node_js:
 before_install:
   - time sudo pip install --use-mirrors -r ./test-infra/requirements.txt
 install:
-  - time gem install jekyll
+  - if [ "$TWBS_TEST" = validate-html ]; then time gem install jekyll; fi
   - time npm install -g grunt-cli
   - time ./test-infra/node_modules_cache.py download || time npm install
 after_script:
-  - time ./test-infra/node_modules_cache.py upload
+  - if [ "$TWBS_TEST" = core ]; then time ./test-infra/node_modules_cache.py upload; fi
 env:
   global:
     - SAUCE_USERNAME: bootstrap
@@ -16,3 +16,9 @@ env:
     - secure: "gqjqISbxBJK6byFbsmr1AyP1qoWH+rap06A2gI7v72+Tn2PU2nYkIMUkCvhZw6K889jv+LhQ/ybcBxDOXHpNCExCnSgB4dcnmYp+9oeNZb37jSP0rQ+Ib4OTLjzc3/FawE/fUq5kukZTC7porzc/k0qJNLAZRx3YLALmK1GIdUY="
     - secure: "Gghh/e3Gsbj1+4RR9Lh2aR/xJl35HWiHqlPIeSUqE9D7uDCVTAwNce/dGL3Ew7uJPfJ6Pgr70wD3zgu3stw0Zmzayax0hiDtGwcQCxVIER08wqGANK9C2Q7PYJkNTNtiTo6ehKWbdV4Z+/U+TEYyQfpQTDbAFYk/vVpsdjp0Lmc="
     - secure: "RTbRdx4G/2OTLfrZtP1VbRljxEmd6A1F3GqXboeQTldsnAlwpsES65es5CE3ub/rmixLApOY9ot7OPmNixFgC2Y8xOsV7lNCC62QVpmqQEDyGFFQKb3yO6/dmwQxdsCqGfzf9Np6Wh5V22QFvr50ZLKLd7Uhd9oXMDIk/z1MJ3o="
+  matrix:
+    - TWBS_TEST=core
+    - TWBS_TEST=validate-html
+    - TWBS_TEST=sauce-js-unit
+matrix:
+  fast_finish: true

Gruntfile.js

@@ -331,9 +331,19 @@ module.exports = function (grunt) {
   grunt.registerTask('validate-html', ['jekyll', 'validation']);
 
   // Test task.
-  var testSubtasks = ['dist-css', 'jshint', 'jscs', 'qunit', 'validate-html'];
+  var testSubtasks = [];
+  // Skip core tests if running a different subset of the test suite
+  if (!process.env.TWBS_TEST || process.env.TWBS_TEST === 'core') {
+    testSubtasks = testSubtasks.concat(['dist-css', 'jshint', 'jscs', 'qunit']);
+  }
+  // Skip HTML validation if running a different subset of the test suite
+  if (!process.env.TWBS_TEST || process.env.TWBS_TEST === 'validate-html') {
+    testSubtasks.push('validate-html');
+  }
   // Only run Sauce Labs tests if there's a Sauce access key
-  if (typeof process.env.SAUCE_ACCESS_KEY !== 'undefined') {
+  if (typeof process.env.SAUCE_ACCESS_KEY !== 'undefined'
+      // Skip Sauce if running a different subset of the test suite
+      && (!process.env.TWBS_TEST || process.env.TWBS_TEST === 'sauce-js-unit')) {
     testSubtasks.push('connect');
     testSubtasks.push('saucelabs-qunit');
   }