test: report karma results as json (angular#14860)

Author: andrewseguin

package.json

@@ -120,6 +120,7 @@
     "karma-chrome-launcher": "^2.2.0",
     "karma-firefox-launcher": "^1.0.1",
     "karma-jasmine": "^2.0.1",
+    "karma-json-result-reporter": "^1.0.0",
     "karma-parallel": "^0.3.0",
     "karma-sauce-launcher": "^2.0.2",
     "karma-sourcemap-loader": "^0.3.7",

test/karma.conf.js

@@ -9,7 +9,8 @@ module.exports = config => {
     plugins: [
       require('karma-jasmine'), require('karma-browserstack-launcher'),
       require('karma-sauce-launcher'), require('karma-chrome-launcher'),
-      require('karma-firefox-launcher'), require('karma-sourcemap-loader'), {
+      require('karma-firefox-launcher'), require('karma-sourcemap-loader'),
+      require('karma-json-result-reporter'), {
         'middleware:fake-url': [
           'factory',
           function() {
@@ -71,9 +72,13 @@ module.exports = config => {
 
     preprocessors: {'dist/packages/**/*.js': ['sourcemap']},
 
-    reporters: ['dots'],
+    reporters: ['dots', 'json-result'],
     autoWatch: false,
 
+    jsonResultReporter: {
+      outputFile: "/tmp/karma-result.json",
+    },
+
     sauceLabs: {
       testName: 'Angular Material Unit Tests',
       startConnect: false,