UPGRADE frontend test to node 16, run on chrome

The tests were running on PhantomJS, which hasn't been maintained for
years apparently. I tried to run the tests locally and it was erroring
out, though it was erroring with a different error than the error in
github actions. In either case, it would be a good idea to run out
PhantomJS as the cause, so I'm switching it to try to run on Chrome.

The 'puppeteer' package provides a headless Chromium which
can replace it. So I've switched the dependencies to run on headless
Chrome.

I've also updated the github action for the frontend test to the latest
setup-node and set it to run on the more current node 16.

.github/workflows/main.yml

@@ -42,17 +42,17 @@ jobs:
   unit_test_frontend:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
-    - uses: actions/setup-node@v1
+    - uses: actions/checkout@v3
+    - uses: actions/setup-node@v3
       with:
-        node-version: 12
+        node-version: 16
     - name: Install dependencies
       run: |
         npm install
         node_modules/gulp/bin/gulp.js
     - name: Frontend Karma Tests
       run: |
-        node_modules/karma/bin/karma start compair/static/test/config/karma.conf.js --single-run --browsers PhantomJS
+        node_modules/karma/bin/karma start compair/static/test/config/karma.conf.js --single-run
 
   deploy_assets:
     runs-on: ubuntu-latest

compair/static/test/config/karma.conf.js

@@ -1,3 +1,5 @@
+process.env.CHROME_BIN = require('puppeteer').executablePath()
+
 module.exports = function (config) {
     var wiredep = require('wiredep');
     var bowerFiles = wiredep({devDependencies: true, cwd: __dirname + '/../../../..'})['js'];
@@ -20,11 +22,11 @@ module.exports = function (config) {
 
         autoWatch: true,
 
-        browsers: ['Chrome'],
+        browsers: ['ChromeHeadless'],
 
         junitReporter: {
             outputFile: 'test_out/unit.xml',
             suite: 'unit'
         }
     });
-};
+};