WIP - add JS functional test harness

.eslintrc.yml

@@ -1,10 +1,11 @@
 env:
   es6: true
   node: true
+  mocha: true
 
 parserOptions:
   sourceType: module
-  ecmaVersion: 7
+  ecmaVersion: 8
 
 extends:
   - eslint:recommended
@@ -17,6 +18,7 @@ plugins:
 root: true
 
 rules:
+  array-bracket-spacing: [error, never]
   eqeqeq: error
   generator-star-spacing: [warn, {before: true, after: false}]
   guard-for-in: warn  # There's nothing wrong with for..in if you know what you're doing. This is here just to keep me from accidentally saying "for..in" when I mean "for..of". Delete this and come up with a better solution if we ever need to use "for..in".
@@ -36,6 +38,7 @@ rules:
   no-useless-escape: error
   no-var: warn
   no-warning-comments: [warn, {terms: [xxx, fixme, hack], location: start}]
+  object-curly-spacing: [error, never]
   object-shorthand: [error, properties]
   prefer-const: off
   quotes: [error, single, {avoidEscape: true, allowTemplateLiterals: true}]

.gitignore

@@ -6,5 +6,6 @@
 **/*.js
 !/rollup.config.js
 !/trainees.js
+!/test/browser/*
 /cli/build
 /cli/dist

.travis.yml

@@ -5,10 +5,15 @@ jobs:
       language: node_js
       node_js:
         - node
+      env:
+        - MOZ_HEADLESS=1
       addons:
         apt:
           packages:
             - python-virtualenv
+        firefox: latest
+      script:
+        - npm test
       after_success:
         - "npm run coveralls"
     - stage: test

Makefile

@@ -8,13 +8,14 @@ all: $(JS)
 
 lint:
 	@node_modules/.bin/eslint --ext mjs .
+	@node_modules/.bin/eslint test/browser
 
 test: $(JS)
-	@node_modules/.bin/mocha
+	@node_modules/.bin/mocha --recursive
 	pytest cli/fathom_web/test
 
 coverage: $(JS)
-	@node_modules/.bin/istanbul cover node_modules/.bin/_mocha
+	@node_modules/.bin/istanbul cover node_modules/.bin/_mocha -- --recursive
 
 debugtest: $(JS)
 	# This is known to work on node 7.6.0.