test: use mocha instead of nodeunit (axios#1655)

CONTRIBUTING.md

@@ -25,7 +25,7 @@ Please update the docs accordingly so that there are no discrepencies between th
 
 ### Developing
 
-- `grunt test` run the jasmine and nodeunit tests
+- `grunt test` run the jasmine and mocha tests
 - `grunt build` run webpack and bundle the source
 - `grunt version` prepare the code for release
 - `grunt watch:test` watch for changes and run `test`

Gruntfile.js

@@ -65,8 +65,13 @@ module.exports = function(grunt) {
       }
     },
 
-    nodeunit: {
-      all: ['test/unit/**/*.js']
+    mochaTest: {
+      test: {
+        src: ['test/unit/**/*.js']
+      },
+      options: {
+        timeout: 30000,
+      },
     },
 
     watch: {
@@ -96,7 +101,7 @@ module.exports = function(grunt) {
     grunt.file.write('bower.json', JSON.stringify(bower, null, 2));
   });
 
-  grunt.registerTask('test', 'Run the jasmine and nodeunit tests', ['eslint', 'nodeunit', 'karma:single', 'ts']);
+  grunt.registerTask('test', 'Run the jasmine and mocha tests', ['eslint', 'mochaTest', 'karma:single', 'ts']);
   grunt.registerTask('build', 'Run webpack and bundle the source', ['clean', 'webpack']);
   grunt.registerTask('version', 'Sync version info for a release', ['usebanner', 'package2bower']);
 };

package.json

@@ -39,10 +39,10 @@
     "grunt-banner": "^0.6.0",
     "grunt-cli": "^1.2.0",
     "grunt-contrib-clean": "^1.1.0",
-    "grunt-contrib-nodeunit": "^1.0.0",
     "grunt-contrib-watch": "^1.0.0",
     "grunt-eslint": "^20.1.0",
     "grunt-karma": "^2.0.0",
+    "grunt-mocha-test": "^0.13.3",
     "grunt-ts": "^6.0.0-beta.19",
     "grunt-webpack": "^1.0.18",
     "istanbul-instrumenter-loader": "^1.0.0",
@@ -61,11 +61,12 @@
     "karma-webpack": "^1.7.0",
     "load-grunt-tasks": "^3.5.2",
     "minimist": "^1.2.0",
+    "mocha": "^5.2.0",
     "sinon": "^4.5.0",
-    "webpack": "^1.13.1",
-    "webpack-dev-server": "^1.14.1",
+    "typescript": "^2.8.1",
     "url-search-params": "^0.10.0",
-    "typescript": "^2.8.1"
+    "webpack": "^1.13.1",
+    "webpack-dev-server": "^1.14.1"
   },
   "browser": {
     "./lib/adapters/http.js": "./lib/adapters/xhr.js"