Xunit中的测试异常() [英] Test Exceptions in Xunit ()

问题描述

我正在尝试使用此方法编写Xunit测试:

I am trying to write Xunit test on this method:

public async Task<IEnumerable<T>> RunSQLQueryAsync(string queryString)
{
    try
    {
        //do something
    }
    catch (DocumentClientException e)
    {
        throw new InvalidOperationException(e);
    }

}

这是单元测试:

[Fact]
public async virtual Task Test_Exception()
{
    var queryString = "SELECT * FROM c";
    var exception = Record.ExceptionAsync(async () => await classname.RunSQLQueryAsync(queryString));
    Assert.NotNull(exception);
    Assert.IsType<DocumentClientException>(exception);
}

但是该方法失败了，并显示:

But the method failed and it says:

消息:Assert.IsType()预期失败:System.DocumentClientException实际:
System.Threading.Tasks.Task`1 [[System.Exception，System.Private.CoreLib，版本= 4.0.0.0，文化=中性，PublicKeyToken = xxx]]

Message: Assert.IsType() Failure Expected: System.DocumentClientException Actual:
System.Threading.Tasks.Task`1[[System.Exception, System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=xxx]]

当我调试测试时，它不会进入catch块.所以我的问题是如何使单元测试期望方法 RunSQLQueryAsync 具有 DocumentClientException ?

When I debugged the test, it doesn't go to the catch block. So my question is how to make the unit test expects the method RunSQLQueryAsync to have DocumentClientException?

推荐答案

测试未在等待从 Record.ExceptionAsync 返回的 Task< Exception> 实际上是在 Task 本身上完成的.

The test is not awaiting the Task<Exception> returned from Record.ExceptionAsync so the following assertion is actually being done on the Task itself.

同样，被测方法消耗 DocumentClientException 并引发 InvalidOperationException 的新异常，因此这是应有的类型.

Also the method under test consumes the DocumentClientException and throws a new exception of InvalidOperationException so that is the type that should be expected.

[Fact]
public async virtual Task Test_Exception() {
    //Arrange
    var queryString = "SELECT * FROM c";

    //Act
    var exception = await Record.ExceptionAsync(() =>
        classname.RunSQLQueryAsync(queryString));

    //Assert
    Assert.NotNull(exception);
    Assert.IsType<InvalidOperationException>(exception);
}

在 Record.ExceptionAsync

还假设被测类已经被设置为具有模拟的依赖关系，该依赖关系将在所提供的代码片段的//做某事部分中引发所需的异常.

The assumption is also that the class under test has been setup with a mocked dependency that will throw the desired exception in the //do something part of the provided snippet.

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