使用接口在 Moq 中模拟泛型方法

Question

我正在尝试为以下通用接口设置最小起订量，但出现异常

 public interface IReadAccess<TEntity>
 {
     Task<IEnumerable<TEntity>> GetAll();
 }

var m = new Mock<IReadAccess<Foo>>(MockBehavior.Strict);

m.Setup(p => p.GetAll()).ReturnsAsync(new List<Foo>());

m.VerifyAll();

出现以下异常

Moq.MockException
  HResult=0x80131500
  Message=The following setups on mock
    'Mock<EPIC.CrossCutting.Interfaces.DAL.Framework.IReadAccess<EPIC.CrossCutting.DTOs.Data.Announcement.AnnouncementCrosscutDTO>:00000002>' 
  were not matched:
IReadAccess<AnnouncementCrosscutDTO> p => p.GetAll()

  Source=Moq
  StackTrace:
   at Moq.Mock.VerifyAll()
   at EPIC.Tests.Business.Rules.Announcements.AnnouncementPlanning.CrosscutsProgrammaticActivitiesValidationRuleServiceTests.<ExecuteSuccessTest>d__5.MoveNext() 
in D:\dev\main\Tests\EPIC.Tests.Business.Rules\Announcements\AnnouncementPlanning\CrosscutsProgrammaticActivitiesValidationRuleServiceTests.cs:line 108

Answer 1

您的测试正确地失败了，因为您试图验证是否调用了 GetAll()，即使您实际上并没有调用它。

如果您在测试中或正在测试的代码中调用该方法，它将通过。

[Fact]
public async Task Test1()
{
    var m = new Mock<IReadAccess<Foo>>(MockBehavior.Strict);
    m.Setup(p => p.GetAll()).ReturnsAsync(new List<Foo>());

    var result = await m.Object.GetAll();

    m.VerifyAll();
}

线索在您的错误消息中： Message=The following setups on mock .... were not matched: IReadAccess p => p.GetAll()

Answer 2

谢谢康奈尔，这是预期的工作，但我有类似的方法

public interface IReadAccess<TEntity>  
{  
    Task<IEnumerable<TEntity>> GetAll();   
    Task<IEnumerable<TEntity>> Find(FormattableString whereClause, object whereClauseObject);

}

并尝试设置

var m = new Mock<IReadAccess<Foo>>(MockBehavior.Strict);
m.Setup(x => x.Find($"ID = @ID", new { ID = 5 })).ReturnsAsync(new List<Foo>());
var result = await m.Object.Find($"ID= @ID", new { ID = 5 });
m.VerifyAll();

在对现有代码进行一些更改后，现在设置工作正常，但在从测试调用时实际服务出现错误，更新代码

var test = new Test {ID = 5};
object whereClause = new { ID = test.ID };
            FormattableString formattableString = $"ID = @ID";

            m.Setup(x => x.Find(formattableString, whereClause)).ReturnsAsync(new List<Foo>());

 var ruleServiceOutput = await this.testValidationRuleService.ExecuteAsync(test);

实际代码

public async Task<IRuleServiceOutput<bool>> ExecuteAsync(Test test)
        {
            var errors = new List<string>();

            object whereClause = new { ID = test.ID };
            FormattableString formattableString = $"ID = @ID";

            var output = (await m.Find(formattableString, whereClause)).ToArray();

            return new RuleServiceOutput<bool>(output.Errors.IsEmpty(), output.Errors);
        }

'IReadAccess`1.Find(ID = @ID, { ID = 5 }) 调用失败，模拟行为严格。模拟上的所有调用都必须具有相应的设置。'

设置 MockBehavior.Default 后一切正常:)

使用接口在 Moq 中模拟泛型方法

Mocking generic methods in Moq with interface

c#

unit-testing

moq