摩卡和詩乃發行JS單元測試

Question

這是我連接兩個字符串的基本JS， context.getVariable是我想使用Sinon模擬的東西，

//util.js
var p;

function concat(p) {
  var first_name = context.getVariable('first_name');
  var res = p.concat(first_name);
  return res;
}

concat(p);

我添加了這個test.js ，

var expect = require('expect.js');
var sinon = require('sinon');
var rewire = require('rewire');

var app = rewire('./util.js');

var fakeContext = {
  getVariable: function(s) {}
}

var contextGetVariableMethod;

beforeEach(function () {
  contextGetVariableMethod = sinon.stub(fakeContext, 'getVariable');
});

afterEach(function() {
  contextGetVariableMethod.restore();
});

describe('feature: concat', function() {
  it('should concat two strings', function() {
    contextGetVariableMethod.withArgs('first_name').returns("SS");
    app.__set__('context', fakeContext);

    var concat = app.__get__('concat');
    expect(concat("988")).to.equal("988SS");
  });
}); 

我在跑步，

node_modules.bin>摩卡R：\\ abc \\ js-unit-test \\ test.js

util.js:7
    var first_name = context.getVariable('first_name');
                             ^

TypeError: context.getVariable is not a function

Answer 1

您需要在此處導入實際上下文，然后使用sinon.stub模擬該getVariable方法，以便在您的實際代碼運行時它將獲取該方法。

var expect = require('expect.js');
var sinon = require('sinon');
var rewire = require('rewire');
var context = require('context') // give correct path here
var app = rewire('./util.js');

var fakeContext = {
  getVariable: function(s) {}
}

beforeEach(function () {
  contextGetVariableMethod = sinon.stub(context, 'getVariable');
});

afterEach(function() {
  contextGetVariableMethod.restore();
});

describe('feature: concat', function() {
  it('should concat two strings', function() {
    contextGetVariableMethod.withArgs('first_name').returns("SS");
    var concat = app.__get__('concat');
    expect(concat("988")).to.equal("988SS");
  });
});