Add karma & chrome/firefox headless browser fixtures (#3146)

* Add karma & chrome/firefox headless browser fixtures

* Add test helper for conditional web3 require

* Add websocket port test helper

* Move build/lint to their own CI job

* Fix package-lock from rebase

* Fix ci.sh

* Skip all websockets tests for geth.instamine

Author: cgewecke

.travis.yml

@@ -10,7 +10,14 @@ matrix:
     - node_js: 12
       env: TEST=unit
     - node_js: 10
-      env: TEST=unit_and_e2e
+      env: TEST=build_and_lint
+    - node_js: 10
+      env: TEST=unit_and_e2e_clients
+    - node_js: 10
+      env: TEST=e2e_browsers
+      addons:
+        chrome: stable
+        firefox: latest
 addons:
   apt:
     sources:
@@ -26,6 +33,7 @@ before_install:
       export LINK="gcc-5";
       export LINKXX="g++-5";
     fi
+  - "export DISPLAY=:99.0"
 install:
     - npm install
 script:

karma.conf.js

@@ -0,0 +1,40 @@
+process.env.CHROME_BIN = require('puppeteer').executablePath();
+process.env.MOZ_HEADLESS = 1;
+
+module.exports = function (config) {
+    config.set({
+        frameworks: [
+            'mocha',
+            'browserify'
+        ],
+        files: [
+            'node_modules/@babel/polyfill/dist/polyfill.js', // For async/await in tests
+            'test/**/e2e*.js'
+        ],
+        preprocessors: {
+            'test/**/e2e*.js': [ 'browserify' ]
+        },
+        plugins: [
+            'karma-chrome-launcher',
+            'karma-firefox-launcher',
+            'karma-mocha',
+            'karma-browserify',
+            'karma-spec-reporter'
+        ],
+        reporters: ['spec'],
+        port: 9876,  // karma web server port
+        colors: true,
+        logLevel: config.LOG_INFO,
+        autoWatch: false,
+        browsers: [
+            'ChromeHeadless',
+            'FirefoxHeadless'
+        ],
+        customLaunchers: {
+            FirefoxHeadless: {
+                base: 'Firefox',
+                flags: ['-headless'],
+            },
+        },
+    });
+};