哪个单元测试将强制编写下一个异步C＃代码？

Question

On this link here , a recommendation is made on how to write a async method in c#, which is:

using System.Threading.Tasks;
...
void Foo(){}
...
new Task(Foo).Start();

My question is about how to apply a TDD approach to that code, exactly: which unit test I should write to force the writing of the previous code.

Thanks :)

Answer 1

I think you have to ask yourself what you're actually testing? In the example you provided:

void Foo(){}

Foo is just a method on class so you would create a test that tests the functionality of Foo and it has nothing to do with writing tests for async code.

However if Foo had a return type of Task or Task<T> you could do the following.

Given the class:

public class Bar
{
    public Task<string> Foo()
    {
        Console.WriteLine("foo called");
        return Task.FromResult("123");
    }
}

The test would then look like:

[TestClass]
public class BarTest
{

    [TestMethod]
    public async Task Test_Foo()
    {
        // Arrange
        var bar = new Bar();

        // Act
        var result = await bar.Foo();

        // Assert
        Assert.AreEqual("123", result);
    }
}