c# – 单元测试中的Mock IHttpContextAccessor

发布时间：2020-12-15 08:21:48 所属栏目：百科来源：网络整理

导读：我有一个方法来使用IHttpContextAccessor获取标头值 public class HeaderConfiguration : IHeaderConfiguration{ public HeaderConfiguration() { } public string GetTenantId(IHttpContextAccessor httpContextAccessor) { return httpContextAccessor.Htt

我有一个方法来使用IHttpContextAccessor获取标头值

public class HeaderConfiguration : IHeaderConfiguration
{
    public HeaderConfiguration()
    {

    }

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

我正在测试GetBookByBookId方法

假设该方法如下所示：

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
        //...
    }
}

这是我对GetBookByBookId方法的单元测试

[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: ‘Type to mock must be an interface or an abstract or non-sealed class. ‘

我想知道用标题值模拟IHttpContextAccessor的正确方法是什么？

解决方法

您可以使用DefaultHttpContext作为IHttpContextAccessor.HttpContext的支持.节省您必须设置太多东西

接下来,您不能使用It.IsAny< string>()作为返回结果.它们仅用于设置表达式.

检查重构器

[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>>();
}

Class In Test也可能存在问题,因为它应该在实际显式注入时手动初始化HeaderConfiguration.

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

（编辑：李大同）

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