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单元测试中的模拟ihttpContextAccessor

asp.net-core-webapi moq asp.net-core unit-testing c#

superninja · 技术社区 · 6 年前

我有一个方法可以使用 IHttpContextAccessor

public class HeaderConfiguration : IHeaderConfiguration
{
    public HeaderConfiguration()
    {

    }

    public string GetTenantId(IHttpContextAccessor httpContextAccessor)
    {
        return httpContextAccessor.HttpContext.Request.Headers["Tenant-ID"].ToString();
    }
}

我在测试 GetBookByBookId 方法

假设方法如下:

public class Book
{
    private readonly IHttpContextAccessor _httpContextAccessor;
    private IHeaderConfiguration _headerConfiguration;
    private string _tenantID;

    public Book(IHeaderConfiguration headerConfiguration, IHttpContextAccessor httpContextAccessor){
        var headerConfig = new HeaderConfiguration();
        _httpContextAccessor = httpContextAccessor;
        _tenantID = headerConfig.GetTenantId(_httpContextAccessor);
    }

    public Task<List<BookModel>> GetBookByBookId(string id){
        //do something with the _tenantId
        //...
    }
}

这是我的单元测试 GetBookByBookID 方法

[Fact]
public void test_GetBookByBookId()
{
    //Arrange

    //Mock IHttpContextAccessor
    var mockHttpContextAccessor = new Mock<IHttpContextAccessor>();

    mockHttpContextAccessor.Setup(req => req.HttpContext.Request.Headers["Tenant-ID"].ToString()).Returns(It.IsAny<string>());
    //Mock HeaderConfiguration
    var mockHeaderConfiguration = new Mock<IHeaderConfiguration>();
    mockHeaderConfiguration.Setup(x => x.GetTenantId(mockHttpContextAccessor.Object)).Returns(It.IsAny<string>());

    var book = new Book( mockHttpContextAccessor.Object, mockHeaderConfiguration.Object);

    var bookId = "100";

    //Act
    var result = book.GetBookByBookId(bookId);

    //Assert
    result.Result.Should().NotBeNull().And.
        BeOfType<List<BookModel>>();
}

但对于这一行:

mockHttpContextAccessor.Setup(req => req.HttpContext.Request.Headers["Tenant-ID"].ToString()).Returns(It.IsAny<string>());

它说

system.notsupportedexception:“要模拟的类型必须是接口、抽象类或非密封类。”

我在想什么是嘲笑的正确方法 IHttpContextAccessor接口 有头值吗?

1 回复 | 直到 6 年前

Nkosi 6 年前

你可以使用 DefaultHttpContext 作为后盾 IHttpContextAccessor.HttpContext . 省得你设置太多东西

接下来你不能使用 It.IsAny<string>() 作为一个 Returns 结果。它们本应单独用于设置表达式。

检查重构

[Fact]
public async Task test_GetBookByBookId() {
    //Arrange

    //Mock IHttpContextAccessor
    var mockHttpContextAccessor = new Mock<IHttpContextAccessor>();
    var context = new DefaultHttpContext();
    var fakeTenantId = "abcd";
    context.Request.Headers["Tenant-ID"] = fakeTenantId;
    mockHttpContextAccessor.Setup(_ => _.HttpContext).Returns(context);
    //Mock HeaderConfiguration
    var mockHeaderConfiguration = new Mock<IHeaderConfiguration>();
    mockHeaderConfiguration
        .Setup(_ => _.GetTenantId(It.IsAny<IHttpContextAccessor>()))
        .Returns(fakeTenantId);

    var book = new Book(mockHttpContextAccessor.Object, mockHeaderConfiguration.Object);

    var bookId = "100";

    //Act
    var result = await book.GetBookByBookId(bookId);

    //Assert
    result.Should().NotBeNull().And.
        BeOfType<List<BookModel>>();
}

测试中的类也可能有问题,因为它正在手动初始化 HeaderConfiguration 什么时候应该明确注入。

public Book(IHeaderConfiguration headerConfiguration, IHttpContextAccessor httpContextAccessor) {
    _httpContextAccessor = httpContextAccessor;
    _tenantID = headerConfiguration.GetTenantId(_httpContextAccessor);
}