use mocha report to show diff (#3365)

Author: Feiyang1

config/karma.base.js

@@ -67,7 +67,7 @@ const config = {
   // test results reporter to use
   // possible values: 'dots', 'progress'
   // available reporters: https://npmjs.org/browse/keyword/karma-reporter
-  reporters: ['spec', 'coverage-istanbul' /*, 'saucelabs' */],
+  reporters: ['mocha', 'coverage-istanbul' /*, 'saucelabs' */],
 
   // web server port
   port: 8089,
@@ -124,13 +124,13 @@ const config = {
 if (false /* process.env.TRAVIS */) {
   config.browsers = [...config.browsers, ...Object.keys(sauceLabsBrowsers)];
 }
-
+config.mochaReporter = {
+  showDiff: true
+};
 // Make it easy to spot failed tests in CI
 if (process.env.CI) {
-  config.specReporter = {
-    suppressErrorSummary: true,
-    suppressPassed: true, // do not print information about passed tests
-    suppressSkipped: true
+  config.mochaReporter = {
+    output: 'minimal'
   };
 }
 

package.json

@@ -113,6 +113,7 @@
     "karma-sauce-launcher": "1.2.0",
     "karma-sourcemap-loader": "0.3.7",
     "karma-spec-reporter": "0.0.32",
+    "karma-mocha-reporter": "2.2.5",
     "karma-summary-reporter": "1.8.0",
     "karma-webpack": "4.0.2",
     "lcov-result-merger": "3.1.0",

yarn.lock

@@ -9375,6 +9375,15 @@ [email protected]:
   dependencies:
     is-wsl "^2.1.0"
 
+[email protected]:
+  version "2.2.5"
+  resolved "https://registry.npmjs.org/karma-mocha-reporter/-/karma-mocha-reporter-2.2.5.tgz#15120095e8ed819186e47a0b012f3cd741895560"
+  integrity sha1-FRIAlejtgZGG5HoLAS8810GJVWA=
+  dependencies:
+    chalk "^2.1.0"
+    log-symbols "^2.1.0"
+    strip-ansi "^4.0.0"
+
 [email protected]:
   version "1.3.0"
   resolved "https://registry.npmjs.org/karma-mocha/-/karma-mocha-1.3.0.tgz#eeaac7ffc0e201eb63c467440d2b69c7cf3778bf"
@@ -10075,7 +10084,7 @@ log-symbols@^1.0.2:
   dependencies:
     chalk "^1.0.0"
 
-log-symbols@^2.2.0:
+log-symbols@^2.1.0, log-symbols@^2.2.0:
   version "2.2.0"
   resolved "https://registry.npmjs.org/log-symbols/-/log-symbols-2.2.0.tgz#5740e1c5d6f0dfda4ad9323b5332107ef6b4c40a"
   integrity sha512-VeIAFslyIerEJLXHziedo2basKbMKtTw3vfn5IzG0XTjhAVEJyNHnL2p7vc+wBDSdQuUpNw3M2u6xb9QsAY5Eg==