单元测试工具——如何使用SpecFlow

安装SpecFlow

菜单栏——工具——扩展和更新

Nuget

开始使用

新建项目

新建feature文件

生成定义

单击 Generate Step Definitions，出现下图

生成AddTestSteps。
生成的代码文件。

using System;
using TechTalk.SpecFlow;

namespace SpecFlowTest
{
    [Binding]
    public class AddTestSteps
    {
        [Given(@"I have entered (.*) into the calculator")]
        public void GivenIHaveEnteredIntoTheCalculator(int p0)
        {
            ScenarioContext.Current.Pending();
        }
        
        [Given(@"I have also entered (.*) into the calculator")]
        public void GivenIHaveAlsoEnteredIntoTheCalculator(int p0)
        {
            ScenarioContext.Current.Pending();
        }
        
        [When(@"I press add")]
        public void WhenIPressAdd()
        {
            ScenarioContext.Current.Pending();
        }
        
        [Then(@"the result should be (.*) on the screen")]
        public void ThenTheResultShouldBeOnTheScreen(int p0)
        {
            ScenarioContext.Current.Pending();
        }
    }
}

修改为以下

using Microsoft.VisualStudio.TestTools.UnitTesting;
using System;
using TechTalk.SpecFlow;

namespace SpecFlowTest
{
    [Binding]
    public class AddTestSteps
    {
        private int result;
        private Calculator calculator = new Calculator();


        [Given(@"I have entered (.*) into the calculator")]
        public void GivenIHaveEnteredIntoTheCalculator(int number)
        {
            calculator.FirstNumber = number;
        }
        
        [Given(@"I have also entered (.*) into the calculator")]
        public void GivenIHaveAlsoEnteredIntoTheCalculator(int number)
        {
            calculator.SecondNumber = number;
        }
        
        [When(@"I press add")]
        public void WhenIPressAdd()
        {
            result = calculator.Add();
        }
        
        [Then(@"the result should be (.*) on the screen")]
        public void ThenTheResultShouldBeOnTheScreen(int expectedResult)
        {
            Assert.AreEqual(expectedResult, result);
        }
    }
}    

namespace SpecFlowTest
{
    public class Calculator
    {
        public int FirstNumber { get; set; }
        public int SecondNumber { get; set; }

        public int Add()
        {
            return FirstNumber + SecondNumber;
        }
    }
}

Specflow使用的默认测试框架是Nunit，而我们创建的项目使用Mstest。通过修改配置文件app.config添加<unitTestProvider name=“mstest”/>结点来更换。

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <configSections>
    <section name="specFlow" type="TechTalk.SpecFlow.Configuration.ConfigurationSectionHandler, TechTalk.SpecFlow" />
  </configSections>
  <specFlow>
    <!-- For additional details on SpecFlow configuration options see http://go.specflow.org/doc-config -->
    <unitTestProvider name="mstest"/>
  </specFlow>
  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="System.ValueTuple" publicKeyToken="cc7b13ffcd2ddd51" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-4.0.2.0" newVersion="4.0.2.0" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>
</configuration>

运行结果