MoqEFCoreExtension 1.0.1

MoqEFCoreExtension

在单元测试(Unit Test)时，如果使用Moq作为隔离框架，并需要模似(Mock) DbContext(Entity Framework Core)下的DbSet<Entity>，本项目给出了解决方案，可以用List<Entity>或Entity[]，模拟DbSet<Entity>完成测试操作。 本例是采用XUnit进行单元测试。 Demo:

模拟DbSet

    /// <summary>
    /// 按问题查询答案
    /// </summary>
    [Fact]
    public void GetAnswer_Default_ReturnCount()
    {
        //Mock DbContext
        var dbMock = new Mock<TestManageDBContext>();
        //实例化被测试方法
        var answerRepository = new AnswerRepository(dbMock.Object);
        //模拟集合
        var list = new List<Answers> {
            new Answers { Id = 1, Answer = "答案1",IsAnswer=true,QuestionId=1 },
            new Answers { Id = 2, Answer = "答案2",IsAnswer=false,QuestionId=1 }
        };
        //Mock  DbSet<Answers>
        var answerSet = new Mock<DbSet<Answers>>().SetupList(list);      
        //装载测试数据
        dbMock.Setup(db => db.Answers).Returns(answerSet.Object);
        //设用被测试方法，在该方中用到了TestManageDBContext.Answers.Where执行查询，所以上面代码要把List<Answers>装载成DbSet<Answers>
        var answers = answerRepository.GetAnswers(1);
        //断言
        Assert.Equal(2, answers.Count);
    }

模拟DbSet下的SingleOrDefault

   /// <summary>
   /// ModifyAnswer正常测试
   /// </summary>
   [Theory]
   [InlineData(0)]
   [InlineData(1)]
   public void ModifyAnswer_Default_ReturnTrue(int result)
   {   
       //Mock DbContext
       var dbMock = new Mock<TestManageDBContext>();
       //实例化被测试方法
       var answerRepository = new AnswerRepository(dbMock.Object);  
       //模拟集合
       var list = new List<Answers> {
           new Answers { Id = 1, Answer = "答案1",IsAnswer=true,QuestionId=1 },
           new Answers { Id = 2, Answer = "答案2",IsAnswer=false,QuestionId=1 }
       };
       //Mock DbContext DbSet<Answers>
       var answerSet = new Mock<DbSet<Answers>>().SetupList(list);
       //用list装载DbSet<Answers>
       dbMock.Setup(db => db.Answers).Returns(answerSet.Object);
       //模拟保存方法返回值
       dbMock.Setup(db => db.SaveChanges()).Returns(value: result);
       //修改方法的入参
       var answer = new Answers { Id = 1 };
       //调用修改方法，修改方法用中到了 db.Answers.SingleOrDefault(s=>s.Id==answer.Id)，只要模拟了DbSet<Answers>，SingleOrDefault就可调用了
       var backResult = answerRepository.ModifyAnswer(answer);
       Assert.Equal(result == 1, backResult);
   }