起订量的界面和设置模拟

Question

我有一个接口来检查元音，并返回一个char作为

public interface IVowChecker 
{ 
    bool VowCheck(char a); 
    char ReturnChar(int n); 
    Student GetStudentById(int n); 
} 

这是使用这个VowChecker

具体类实现

public class VowChecker:IVowChecker 
{ 
    public bool VowCheck(char a) 
    { 
     if (a == 'a' || a == 'A') 
      return true; 
     return false; 
    } 
    public char ReturnChar(int n) 
    { 
     return (char)n; 
    } 
    public Student GetStudentById(int n) 
    { 
     var list = new [] 
     { 
      new Student{RollNo=1,Name="A"}, 
      new Student{RollNo=2,Name="B"}, 
      new Student{RollNo=3,Name="C"}, 
      new Student{RollNo=4,Name="D"}, 
      new Student{RollNo=5,Name="E"}, 
      new Student{RollNo=6,Name="F"}, 
     }; 

     var student = from i in list 
         where i.RollNo == n 
         select i; 
     return student.FirstOrDefault(); 
    } 
} 

与服务

public class MyCharService 
{ 
    private readonly IVowChecker _checker; 

    public MyCharService(IVowChecker checker) 
    { 
     _checker = checker; 
    } 
    public bool CheckInput(char a) 
    { 
     return _checker.VowCheck(a); 
    } 
    public char ReturnChar(int a) 
    { 
     return _checker.ReturnChar(a); 
    } 
    public Student GetStudentById(int n) 
    { 
     return _checker.GetStudentById(n); 
    } 
} 

我正在使用Xunit测试框架进行单元测试和Moq库。 我的单元测试代码是

public class MyCharServiceShould 
{ 
    ... 

    [Theory] 
    [InlineData(65)] 
    [InlineData(68)] 
    public void BeAbleToReturnChar(int n) 
    { 
     var service = new Mock<IVowChecker>(); 

     service.Setup(i => i.ReturnChar(n)).Returns('A'); 
     var obj = new MyCharService(service.Object); 
     var result = obj.ReturnChar(n); 

    } 
    [Theory] 
    [InlineData(2)] 
    public void BeAbleToRetrieveStudent(int n) 
    { 
     var service = new Mock<IVowChecker>(); 
     service.Setup<Student>(i => i.GetStudentById(n)).Returns<Student>(f => (Student)f); 
     var ob = new MyCharService(service.Object); 
     var res = ob.GetStudentById(2); 
     Assert.Equal(res.Name, "B"); 
    } 
} 

我的学生类

public class Student 
{ 
    public int RollNo{ get; set; } 
    public string Name { get; set; } 
} 

我在测试的最后一行用一个调试器和检查的两个测试值。对于第一次测试，我期待'A'作为结果，对于第二次测试，我期待'D'作为结果。但在这两种情况下，我都会得到'A'。任何人都可以帮助我，我错过了这个概念。谢谢。

Answer 1

的问题是，对于ReturnChar

service.Setup(i => i.ReturnChar(n)).Returns('A'); 

安装说，

Whenever ReturnChar() is called, give an answer of 'A' 

它忽略了输入 'n' 和刚刚返回 'A'。如果你想让它为每个测试返回一个不同的字符，你将需要调整设置。

也许

mockService.Setup(mk => mk.ReturnChar(It.IsAny<int>())).Returns<int>(n => (char)n); 

编辑：扩展显示返回对象（和前面的答案固定的语法）

public class Student 
{ 
    public int Id { get; set; } 
    public string Name { get; set; } 
} 

public interface IService 
{ 
    Student FindStudentById(int id); 
} 

[TestMethod] 
public void FindStudents() 
{ 
    var students = new[] 
    { 
     new Student {Id = 1, Name = "Mon" }, 
     new Student {Id = 2, Name = "Tue" }, 
     new Student {Id = 3, Name = "Wed" }, 
     new Student {Id = 4, Name = "Thu" }, 
    }; 

    var mockService = new Mock<IService>(); 
    mockService.Setup(mk => mk.FindStudentById(It.IsAny<int>())).Returns<int>(id => students.First(s => s.Id == id)); 

    Assert.AreEqual("Wed", mockService.Object.FindStudentById(3).Name); 

}