Add test coverage

.gitignore

@@ -1,3 +1,4 @@
 npm-debug.log*
 node_modules
 dist
+coverage

package.json

@@ -6,6 +6,7 @@
   "scripts": {
     "clean": "rimraf dist",
     "test": "mocha",
+    "test:coverage": "istanbul cover node_modules/.bin/_mocha",
     "lint": "eslint src test",
     "build:umd": "webpack src/index.js dist/axios-mock-adapter.js",
     "build:umd:min": "cross-env NODE_ENV=production webpack src/index.js dist/axios-mock-adapter.min.js",
@@ -40,7 +41,8 @@
     "axios": "^0.14.0",
     "chai": "^3.5.0",
     "cross-env": "^3.0.0",
-    "eslint": "^3.6.0",
+    "eslint": "^3.7.1",
+    "istanbul": "^0.4.5",
     "mocha": "^3.0.2",
     "rimraf": "^2.5.2",
     "webpack": "^1.13.2"

src/utils.js

@@ -91,6 +91,7 @@ function createErrorResponse(message, config, response) {
 }
 
 module.exports = {
+  find: find,
   findHandler: findHandler,
   purgeIfReplyOnce: purgeIfReplyOnce,
   settle: settle

test/basics.spec.js

@@ -46,11 +46,10 @@ describe('MockAdapter basics', function() {
       foo: 'bar'
     });
 
-    instance.get('/foo')
+    return instance.get('/foo')
       .then(function(response) {
         expect(response.status).to.equal(200);
         expect(response.data.foo).to.equal('bar');
-        done();
       });
   });
 

test/utils.spec.js

@@ -0,0 +1,30 @@
+var expect = require('chai').expect;
+var find = require('../src/utils').find;
+
+describe('utility functions', function() {
+  context('find', function() {
+    it('returns the value for which the predicate holds true', function() {
+      var array = [1, 2, 3];
+      var value = find(array, function(value) {
+        return value === 2;
+      });
+      expect(value).to.equal(2);
+    });
+
+    it('returns the first value for which the predicate holds true', function() {
+      var array = [{ key: 1, value: 'one' }, { key: 1, value: 'two' }];
+      var value = find(array, function(value) {
+        return value.key === 1;
+      });
+      expect(value.value).to.equal('one');
+    });
+
+    it('returns undefined if the value is not found', function() {
+      var array = [1, 2, 3];
+      var value = find(array, function(value) {
+        return value === 4;
+      });
+      expect(value).to.be.undefined;
+    });
+  });
+});