[英]Expected invocation on Mock once, but was 0 times
我有一個界面 IVehicle
public interface IVehicle
{
Task<ApiResponse> GetVehicleInfo();
}
這是我的接口實現
public class Vehicle : IVehicle
{
private string m_vehicleId;
private VehicleInfoEndPoint m_vEndPoint;
public Vehicle()
{
}
public Vehicle(string vehicleId, string device, HttpClient client,string Uri)
{
m_vEndPoint = new VehicleInfoEndPoint(device, client, Uri);
}
public async Task<ApiResponse> GetVehicleInfo()
{
await m_vEndPoint.GetVehicleInfoPostAsync();
return m_vehicleInfoEndPoint.FullResponse;
}
}
我想對這個 class 進行單元測試。 為此,我編寫了以下代碼。
[Test]
public void Vehicle_GetVehicleInformation_shouldCall_VehicleInfoEndPoint_GetVehicleInfo()
{
var endPointMock = Mock.Of<IVehicleInfoEndPoint>();
var result = new ApiResponse();
var vehicle = new Mock<IVehicle>();
vehicle.Setup(x => x.GetVehicleInfo()).Returns(Task.FromResult(result));
var response = vehicle.Object.GetVehicleInfo().Result;
Mock.Get(endPointMock).Verify(x => x.GetVehicleInfo(), Times.Once);
}
我的測試因錯誤而失敗
預期在模擬上調用一次,但為 0 次x=> x.GetVehicleInfo()
在這種情況下,在我看來,您想要測試的是調用了x.GetVehicleInfoPostAsync()
。
在這種情況下,您必須定義您的單元工件,它們是:
我做了這個簡單的例子,可以滿足你的要求:
class Program
{
static async Task Main(string[] args)
{
// ARRANGE
var endPointMock = Mock.Of<IVehicleInfoEndPoint>();
var vehicle = new Vehicle(endPointMock);
// ACT
var response = await vehicle.GetVehicleInfo();
// ASSERT
Mock.Get(endPointMock).Verify(x => x.GetVehicleInfoPostAsync(), Times.Once);
}
}
public interface IVehicle
{
Task<ApiResponse> GetVehicleInfo();
}
public class Vehicle : IVehicle
{
private readonly IVehicleInfoEndPoint _endpoint;
public Vehicle(IVehicleInfoEndPoint endpoint)
{
_endpoint = endpoint ?? throw new ArgumentNullException(nameof(endpoint));
}
public async Task<ApiResponse> GetVehicleInfo()
{
await _endpoint.GetVehicleInfoPostAsync();
return _endpoint.FullResponse;
}
}
public interface IVehicleInfoEndPoint
{
Task GetVehicleInfoPostAsync();
ApiResponse FullResponse { get; set; }
}
public class ApiResponse
{
}
當您將測試分為 3 個部分時,它會有所幫助:
看看這個:什么是“存根”?
還可以在亞馬遜上查看“單元測試的藝術”,這本書很棒。
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