Fix build

.travis.yml

@@ -10,6 +10,10 @@ node_js:
 - '6'
 - '4'
 
+before_install:
+- curl -o- -L https://yarnpkg.com/install.sh | bash -s -- --version 1.0.2
+- export PATH=$HOME/.yarn/bin:$PATH
+
 before_script:
 - yarn run bootstrap && yarn run build
 

package.json

@@ -6,7 +6,7 @@
     "build": "gulp build",
     "changelog": "lerna-changelog",
     "clean": "lerna clean",
-    "coverage": "jest --coverage",
+    "coverage": "jest --coverage --maxWorkers=4",
     "coverage-ci": "codecov -f coverage/coverage-final.json",
     "eslint": "eslint packages/*/src/ packages/*/__tests__/ utils/*.js scripts/*.js",
     "eslint-fix": "eslint --fix packages/*/src/ packages/*/__tests__/ utils/*.js scripts/*.js",
@@ -16,7 +16,7 @@
     "lint": "npm run format-check && npm run eslint",
     "publish": "git pull origin master --rebase && npm run build && npm test && lerna publish",
     "publish-internal": "git pull origin master --rebase && npm run build && NPM_DIST_TAG=internal ./node_modules/.bin/lerna publish --skip-git",
-    "test": "jest",
+    "test": "jest --maxWorkers=4",
     "test-ci": "npm run bootstrap && npm run build && npm run coverage",
     "updated": "lerna updated",
     "watch": "gulp watch"

packages/babel-minify/__tests__/cli-tests.js

@@ -1,4 +1,5 @@
 jest.autoMockOff();
+jest.setTimeout(25000);
 
 const { spawn } = require("child_process");
 const path = require("path");