我有一些测试代码声明重复用户无法通过我的UserRepository创建.
User.cs：
public class User
{
public int Id { get; set; }
public string AccountAlias { get; set; }
public string DisplayName { get; set; }
public string Email { get; set; }
public bool IsActive { get; set; }
}
UserRepository.cs：
public class UserRepository
{
public virtual async Task<User> CreateAsync(User entity)
{
if (entity == null)
{
throw new ArgumentNullException("entity");
}
if (await GetDuplicateAsync(entity) != null)
{
throw new InvalidOperationException("This user already exists");
}
return Create(entity);
}
public async Task<User> GetDuplicateAsync(User user)
{
if (user == null)
{
throw new ArgumentNullException("user");
}
return await (from u in Users
where u.AccountAlias == user.AccountAlias &&
u.Id != user.Id &&
u.IsActive
select u).FirstOrDefaultAsync();
}
}
UserRepositoryTests.cs：
public sealed class UserRepositoryTests : IDisposable
{
public UserRepositoryTests()
{
UserRepository = new UserRepository(new FooEntities()); // DbContext
// from EF
}
private UserRepository UserRepository { get; set; }
[Fact]
public void DuplicateUserCannotBeCreated()
{
var testUser = new User // This test user already exists in database
{
Id = 0,AccountAlias = "domain\\foo",DisplayName = "Foo",Email = "foo@bar.com",IsActive = true
};
Assert.Throws<InvalidOperationException>(async () =>
await UserRepository.CreateAsync(testUser));
}
public void Dispose()
{
if (UserRepository != null)
{
UserRepository.Dispose();
}
}
}
当我运行这个单元测试时,抛出Xunit.Sdk.ThrowsException(即没有抛出我的InvalidOperationException)：
Assert.Throws() Failure
Expected: System.InvalidOperationException
Actual: (No exception was thrown)
从调试器中,对GetDuplicateAsync()进行了评估,但是当执行LINQ查询时,结果从未返回,因此没有抛出异常.有人可以帮忙吗？
解决方法
xUnit的Assert.Throws(至少在版本1.9.2上)不是异步感知的.这已在版本2中修复,现在有一个
Assert.ThrowsAsync方法.
因此,您可以升级到xUnit 2或创建自己的方法以使其正常工作：
public async static Task<T> ThrowsAsync<T>(Func<Task> testCode) where T : Exception
{
try
{
await testCode();
Assert.Throws<T>(() => { }); // Use xUnit's default behavior.
}
catch (T exception)
{
return exception;
}
return null;
}
await ThrowsAsync<InvalidOperationException>(async () => await UserRepository.CreateAsync(testUser));
从Haacked’s gist开始.
