[英]How to write unit test for custom model binder in ASP.net core
I have written custom model binder for a property.我已经为一个属性编写了自定义模型绑定器。 Now I am trying to write unit test for the same but not able to create object for model binder.现在我正在尝试为其编写单元测试,但无法为模型绑定器创建对象。 Can anyone help me ?谁能帮我 ? Below is the code for which I have to write test.以下是我必须为其编写测试的代码。
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;
} }
I have created the unit test with Nunit (which is almost the same withy XUnit) and I mocked dependencies with Moq.我已经使用 Nunit 创建了单元测试(这与 XUnit 几乎相同)并且我使用 Moq 模拟了依赖项。 There might be some errors due to online C# compiler but code shown below will give you the idea.由于在线 C# 编译器可能会出现一些错误,但下面显示的代码会给你一个想法。
[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);
}
}
You can use an instance DefaultModelBindingContext
to pass into BindModelAsync()
:您可以使用实例DefaultModelBindingContext
传递到BindModelAsync()
:
[Fact]
public void JourneyTypesModelBinderTest()
{
var bindingContext = new DefaultModelBindingContext();
var bindingSource = new BindingSource("", "", false, false);
var routeValueDictionary = new RouteValueDictionary
{
{"IsSingleWay", true},
{"JourneyType", "Single"}
};
bindingContext.ValueProvider = new RouteValueProvider(bindingSource, routeValueDictionary);
var binder = new JourneyTypesModelBinder();
binder.BindModelAsync(bindingContext);
Assert.True(bindingContext.Result.IsModelSet);
Assert.Equal(JourneyTypes.Single, bindingContext.Result.Model);
}
This can be an alternative to using a mock object for bindingContext
.这可以替代为bindingContext
使用模拟对象。
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