c# - 如何测试 IActionResult 及其内容

Question

我正在使用 C# 和 .NET Core 2.0 开发 ASP.NET Core 2 Web API。

我已经更改了一种方法，将其添加到 try-catch 中以允许我返回状态代码。

public IEnumerable<GS1AIPresentation> Get()
{
    return _context
        .GS1AI
        .Select(g => _mapper.CreatePresentation(g))
        .ToList();
}

更改为:

public IActionResult Get()
{
    try
    {
        return Ok(_context
            .GS1AI
            .Select(g => _mapper.CreatePresentation(g))
            .ToList());
    }
    catch (Exception)
    {
        return StatusCode(500);
    }
}

但是现在我的测试方法出现了问题，因为现在它返回一个 IActionResult而不是 IEnumerable<GS1AIPresentation> :

[Test]
public void ShouldReturnGS1Available()
{
    // Arrange
    MockGS1(mockContext, gs1Data);

    GS1AIController controller =
        new GS1AIController(mockContext.Object, mockMapper.Object);

    // Act
    IEnumerable<Models.GS1AIPresentation> presentations = controller.Get();

    // Arrange
    Assert.AreEqual(presentations.Select(g => g.Id).Intersect(gs1Data.Select(d => d.Id)).Count(),
                    presentations.Count());
}

我的问题在这里:IEnumerable<Models.GS1AIPresentation> presentations = controller.Get(); .

我是否需要重构并创建一个新方法来测试 Select ？

这个选择:

return _context
    .GS1AI
    .Select(g => _mapper.CreatePresentation(g))
    .ToList();

或者也许我可以获得 IEnumerable<Models.GS1AIPresentation>在IActionResult

Answer 1

在 Controller 中调用的 return Ok(...) 返回 OkObjectResult ，它派生自 IActionResult，因此您需要转换为该类型，然后访问其中的值。

[Test]
public void ShouldReturnGS1Available() {
    // Arrange
    MockGS1(mockContext, gs1Data);

    var controller = new GS1AIController(mockContext.Object, mockMapper.Object);

    // Act
    IActionResult result = controller.Get();        

    // Assert
    var okObjectResult = result as OkObjectResult;
    Assert.IsNotNull(okObjectResult);
    var presentations = okObjectResult.Value as IEnumerable<Models.GS1AIPresentation>;
    Assert.IsNotNull(presentations);
    Assert.AreEqual(presentations.Select(g => g.Id).Intersect(gs1Data.Select(d => d.Id)).Count(),
                    presentations.Count());
}

引用 Asp.Net Core Action Results Explained