如何在ASP.NET Core 1 MVC 6中模拟单元/集成测试的IFormFile？

Question

我想编写用于上传ASP.NET Core 1中的文件的测试，但似乎无法找到一种很好的方法来模拟/实例化从IFormFile派生的对象。 关于如何做到这一点的任何建议？

谢谢。

Answer 1

假设你有一个控制器如..

public class MyController : Controller { 
    public Task<IActionResult> UploadSingle(IFormFile file) {...} 
} 

...其中IFormFile.OpenReadStream()与被测方法来访问。您可以使用Moq模拟框架来创建一个测试来模拟流数据。

[TestClass] 
public class IFormFileUnitTests { 
    [TestMethod] 
    public async Task Should_Upload_Single_File() { 
     //Arrange 
     var fileMock = new Mock<IFormFile>(); 
     //Setup mock file using a memory stream 
     var content = "Hello World from a Fake File"; 
     var fileName = "test.pdf"; 
     var ms = new MemoryStream(); 
     var writer = new StreamWriter(ms); 
     writer.Write(content); 
     writer.Flush(); 
     ms.Position = 0; 
     fileMock.Setup(_ => _.OpenReadStream()).Returns(ms); 
     fileMock.Setup(_ => _.FileName).Returns(fileName); 
     fileMock.Setup(_ => _.Length).Returns(ms.Length); 

     var sut = new MyController(); 
     var file = fileMock.Object; 

     //Act 
     var result = await sut.UploadSingle(file); 

     //Assert 
     Assert.IsInstanceOfType(result, typeof(IActionResult)); 
    } 
}