如何在ASP.net Core中编写自定义模型绑定程序的单元测试

问题描述

我已经为属性编写了自定义模型活页夹。现在，我正在尝试编写相同的单元测试，但无法为模型绑定器创建对象。谁能帮我 ？下面是我必须为其编写测试的代码。

I have written custom model binder for a property. Now I am trying to write unit test for the same but not able to create object for model binder. Can anyone help me ? Below is the code for which I have to write test.

public class JourneyTypesModelBinder : IModelBinder
{
    public Task BindModelAsync(ModelBindingContext bindingContext)
    {
        bool IsSingleWay = Convert.ToBoolean((bindingContext.ValueProvider.GetValue("IsSingleWay")).FirstValue);
        bool IsMultiWay = Convert.ToBoolean((bindingContext.ValueProvider.GetValue("IsMultiWay")).FirstValue);

        JourneyTypes journeyType = JourneyTypes.None;
        bool hasJourneyType = Enum.TryParse((bindingContext.ValueProvider.GetValue("JourneyType")).FirstValue, out journeyType);
        if (!hasJourneyType)
        {
            if (IsSingleWay)
                journeyType = JourneyTypes.Single;
            else journeyType = JourneyTypes.MultiWay;
        }

        bindingContext.Result = ModelBindingResult.Success(journeyType);
        return Task.CompletedTask;
    } }

推荐答案

我已经创建了单位使用Nunit进行测试（与XUnit几乎相同），然后使用Moq模拟依赖关系。联机C＃编译器可能会导致一些错误，但是下面显示的代码将为您提供这个想法。

I have created the unit test with Nunit (which is almost the same withy XUnit) and I mocked dependencies with Moq. There might be some errors due to online C# compiler but code shown below will give you the idea.

[TestFixture]
public class BindModelAsyncTest()
{
    private JourneyTypesModelBinder _modelBinder;
    private Mock<ModelBindingContext> _mockedContext;

    // Setting up things
    public BindModelAsyncTest()
    {
        _modelBinder = new JourneyTypesModelBinder();
        _mockedContext = new Mock<ModelBindingContext>();

        _mockedContext.Setup(c => c.ValueProvider)
            .Returns(new ValueProvider()
            {
                // Initialize values that are used in this function
                // "IsSingleWay" and the other values
            });
    }

    private JourneyTypesModelBinder CreateService => new JourneyTypesModelBinder();

    [Test]
    public Task BindModelAsync_Unittest()
    {
        //Arrange
        //We set variables in setup function.
        var unitUnderTest = CreateService();

        //Act
        var result = unitUnderTest.BindModelAsync(_mockedContext);

        //Assert
        Assert.IsNotNull(result);
        Assert.IsTrue(result is Task.CompletedTask);
    }
}

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