test: Add coverage reports

.travis.yml

@@ -57,6 +57,7 @@ install:
 
 script:
 - npm run lint
-- npm run test -- --runInBand
+- npm run test:coverage
 - if test -z "$TRAVIS_TAG"; then npm run make; fi
-after_success: if test -n "$TRAVIS_TAG"; then npm run publish; fi
+
+after_success: if test -n "$TRAVIS_TAG"; then npm run publish; fi

README.md

@@ -1,6 +1,6 @@
 # <img src="https://user-images.githubusercontent.com/378023/49785546-4b7f7000-fd64-11e8-8033-a52c73a07fbf.png" width="60px" align="center" alt="Electron Fiddle icon"> Electron Fiddle
 
-[![Build Status](https://travis-ci.org/electron/fiddle.svg?branch=master)](https://travis-ci.org/electron/fiddle)
+[![Build Status](https://travis-ci.org/electron/fiddle.svg?branch=master)](https://travis-ci.org/electron/fiddle) [![Coverage Status](https://coveralls.io/repos/github/electron/fiddle/badge.svg?branch=master)](https://coveralls.io/github/electron/fiddle?branch=master)
 
 Electron Fiddle lets you create and play with small Electron experiments. It
 greets you with a quick-start template after opening – change a few things,

package.json

@@ -20,6 +20,7 @@
     "publish": "electron-forge publish",
     "start": "rimraf ./dist && electron-forge start",
     "test": "jest --config=jest.json --coverage",
+    "test:coverage": "jest --config=jest.json --coverage --runInBand --coverageReporters=text-lcov | coveralls",
     "tsc": "node ./tools/tsc.js",
     "electron-releases": "node ./tools/fetch-releases.js"
   },
@@ -75,6 +76,7 @@
     "@types/semver": "^5.5.0",
     "@types/tmp": "0.0.33",
     "chokidar": "^2.0.4",
+    "coveralls": "^3.0.2",
     "electron": "3.0.13",
     "enzyme": "^3.6.0",
     "enzyme-adapter-react-16": "^1.5.0",