Xunit 异步测试

异步普通例子

 public class UnitTest1
    {
        [Fact]
        public async Task Add_Should_Return_Total()
        {
            var result = await AddByRemote(2, 2);
            Assert.Equal(4, result);
        }

        async Task<int> AddByRemote(int x, int y)
        {
            await Task.Delay(0);
            return x + y;
        }
    }

异步捕获异常

public class MyTestClass
{
    [Fact]
    public async Task MyTest()
    {
        var ex = await Assert.ThrowsAsync<ArgumentException>(async() =>
        {
           await Add(null, 3);
        });
        Assert.Equal("a", ex.Message);
    }

    public async Task<int> Add(int? a, int b)
    {
        throw new ArgumentException(nameof(a));
    }
}