add coverage to selenium tests

package.json

@@ -10,7 +10,7 @@
     "deployment": "gulp prod",
     "build": "gulp build",
     "test-integration:only": "mocha -R spec ./test-integration/index",
-    "pretest-integration": "npm run build",
+    "pretest-integration": "COVERAGE=true npm run build",
     "test-integration": "./scripts/run-test-integration.sh",
     "lint-cjsx": "./scripts/lint-cjsx-files.sh",
     "start": "gulp dev"
@@ -89,6 +89,7 @@
     "gulp-util": "3.0.6",
     "gulp-watch": "4.3.5",
     "http-server": "0.8.5",
+    "istanbul": "0.4.1",
     "istanbul-instrumenter-loader": "0.1.3",
     "json-loader": "0.5.3",
     "karma": "0.13.19",

test-integration/helpers/describe.coffee

@@ -1,6 +1,7 @@
 selenium = require 'selenium-webdriver'
 seleniumMocha = require('selenium-webdriver/testing')
 _ = require 'underscore'
+
 chai = require 'chai'
 chai.use require 'chai-as-promised'
 expect = {chai}
@@ -25,6 +26,8 @@ logger.addHandler (record) ->
 
 
 
+
+
 describe = (name, cb) ->
   seleniumMocha.describe name, ->
 

test-integration/helpers/user.coffee

@@ -1,6 +1,10 @@
 _ = require 'underscore'
 {TestHelper} = require './test-element'
 
+# Record code coverage before logging out
+istanbul = require 'istanbul'
+{mergeFileCoverage} = istanbul.utils
+
 COMMON_ELEMENTS =
   loginLink:
     linkText: 'Login'
@@ -31,6 +35,21 @@ COMMON_ELEMENTS =
 COMMON_ELEMENTS.eitherSignInElement =
   css: "#{COMMON_ELEMENTS.searchQuery.css}, #{COMMON_ELEMENTS.usernameInput.css}"
 
+
+# Record code coverage before logging out.
+# Merges the coverage results from multiple tests
+__coverage__ = {}
+mergeCoverage = (obj) ->
+  Object.keys(obj).forEach (filePath) ->
+    original = __coverage__[filePath]
+    added = obj[filePath]
+    if original
+      result = mergeFileCoverage(original, added)
+    else
+      result = added
+    __coverage__[filePath] = result
+
+
 class User extends TestHelper
   constructor: (test) ->
     testElementLocator = 'body'
@@ -78,6 +97,10 @@ class User extends TestHelper
     @el.userMenu.isPresent()
 
   _logout: =>
+    # Pull out the coverage data
+    @test.driver.executeScript("var c = window.__coverage__; delete window.__coverage__; return c;").then (results) ->
+      mergeCoverage(results) if results
+
     @el.userMenu.get().click()
     @el.logoutForm.get().submit()
 
@@ -92,6 +115,9 @@ class User extends TestHelper
     @el.homeLink.get().click()
 
 
+User.getCoverageData = ->
+  __coverage__
+
 User.logout = (test) ->
   user = new User(test).logout()
 

webpack.config.coffee

@@ -2,12 +2,21 @@ ExtractTextPlugin = require 'extract-text-webpack-plugin'
 webpack = require 'webpack'
 
 isProduction = process.env.NODE_ENV is 'production'
+isCoverage = process.env.COVERAGE
 LOADERS = if isProduction then [] else ["react-hot", "webpack-module-hot-accept"]
 lessLoader = if isProduction
   { test: /\.less$/,   loader: ExtractTextPlugin.extract('css!less') }
 else
   { test: /\.less$/,   loaders: LOADERS.concat('style-loader', 'css-loader', 'less-loader') }
 
+if isCoverage
+  POST_LOADERS = [
+    { test: /\.coffee$/, loaders: ["istanbul-instrumenter"] }
+    { test: /\.cjsx$/, loaders: ["istanbul-instrumenter"] }
+  ]
+else
+  POST_LOADERS = []
+
 module.exports =
   cache: true
 
@@ -41,7 +50,8 @@ module.exports =
       { test: /\.cjsx$/,   loaders: LOADERS.concat("coffee-jsx-loader") }
       { test: /\.(png|jpg|svg)/, loader: 'file-loader?name=[name].[ext]'}
       { test: /\.(woff|woff2|eot|ttf)/, loader: "url-loader?limit=30000&name=[name]-[hash].[ext]" }
-   ]
+    ]
+    postLoaders: POST_LOADERS
   resolve:
     extensions: ['', '.js', '.json', '.coffee', '.cjsx']