[英]unit testing a webapi async action
I am new to unit testing but trying to get my head around it to try improve the quality of code I write. 我是单元测试的新手,但我试着试着改善我编写的代码质量。
I have created a webapi2 project that returns a customer like 我创建了一个webapi2项目,它返回了一个客户
public async Task<IHttpActionResult> GetCustomer([FromUri]int id)
{
var customer = await _repository.FindCustomerAsync(id);
return Ok(customer);
}
My repository 我的存储库
public async Task<Customer> FindCustomerAsync(int id)
{
using (var context = new MyContext())
{
var result = await context.Customers.FindAsync(id);
return result;
}
}
Previously I was not returning an async task at it was very easy to test. 以前我没有返回异步任务,因为它非常容易测试。 Migrating the action to a async task has made it a little hard for me to test.
将操作迁移到异步任务使我有点难以测试。
I am using Moq and Xunit and my attempt at a unit test looks like 我正在使用Moq和Xunit,我在单元测试中的尝试看起来像
[Fact()]
public async void GetCustomer()
{
var id = 2;
_customerMock.Setup(x => x.FindCustomerAsync(id))
.Returns(Task.FromResult(FakeCustomers()
.SingleOrDefault(cust => cust.customerID == id)));
var controller = new CustomersController(_customerMock.Object).GetCustomer(id);
var result = await controller as Customer;
Assert.NotNull(result);
//Assert.IsType<OkNegotiatedContentResult<Customer>>(negotiatedResult);
//Assert.Equal(negotiatedResult.Content.customerID, id);
}
My FakeCustomers 我的假客户
private IQueryable<Customer> FakeCustomers()
{
return new List<Customer>()
{
new Customer()
{
customerID = 1,
firstName = "Brian",
lastName = "Smith"
},
new Customer()
{
customerID = 2,
firstName = "Tom",
}
}.AsQueryable();
}
the test always fails when trying to cast to Customer {"Object reference not set to an instance of an object."} 尝试转换为Customer {“对象引用未设置为对象的实例时”测试始终失败。
What I am doing wrong with my test? 我的测试我做错了什么?
Can you try this way?: 你能这样试试吗?:
[Fact()]
public async void GetCustomer()
{
var id = 2;
_customerMock.Setup(x => x.FindCustomerAsync(id))
.Returns(Task.FromResult(new Customer()
{
customerID = 2,
firstName = "Tom",
}));
var controller = new CustomersController(_customerMock.Object).GetCustomer(id);
var result = await controller as Customer;
Assert.NotNull(result);
}
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