entityMap|0|type|LINK|mutability|MUTABLE|data|url|https://github.com/aspnet/Mvc/blob/master/src/Microsoft.AspNetCore.Mvc.Core/ActionResultOfT.cs|blocks|key|ars0t|text|在运行时，由于隐式转换，测试中的原始代码仍然有效。|unstyled|depth|inlineStyleRanges|entityRanges|bprfq|但是根据提供的调试器图像，看起来测试是在错误的结果属性上断言的。|9tpf6|因此，虽然更改测试下的方法可以使测试通过，但无论以哪种方式运行，它都可以正常工作|8o3f2|ActioResult<TValue>有两个属性，这两个属性的设置取决于使用它的操作返回的内容。|offset|length|style|CODE|6sbps|///+<summary>
///+Gets+the+<see+cref="ActionResult"/>.
///+</summary>
public+ActionResult+Result+{+get;+}

///+<summary>
///+Gets+the+value.
///+</summary>
public+TValue+Value+{+get;+}|code-block|syntax|javascript|f1t3j|Source|7n02n|因此，当控制器操作使用Ok()返回时，它将通过隐式转换设置操作结果的ActionResult<int>.Result属性。|uitp|public+static+implicit+operator+ActionResult<TValue>(ActionResult+result)
{
++++return+new+ActionResult<TValue>(result);
}|e4fk5|但测试断言了Value属性(请参阅OP中的图像)，在本例中未设置该属性。|8hfef|无需修改被测代码以满足测试要求，它就可以访问Result属性并对该值进行断言|jkcn|[Fact]
public+async+Task+GetLocationsCountAsync_WhenCalled_ReturnsLocationsCount()+{
++++//Arrange
++++_locationsService
++++++++.Setup(_+=>+_.GetLocationsCountAsync(It.IsAny<string>()))
++++++++.ReturnsAsync(10);
++++var+controller+=+new+LocationsController(_locationsService.Object,+null)+{
++++++++ControllerContext+=+{+HttpContext+=+SetupHttpContext().Object+}
++++};

++++//Act
++++var+actionResult+=+await+controller.GetLocationsCountAsync();

++++//Assert
++++var+result+=+actionResult.Result+as+OkObjectResult;
++++result.Should().NotBeNull();
++++result.Value.Should().Be(10);

++++VerifyAll();
}|2lt6g^0|0|0|0|0|J|0|0|0|6|0|0|B|4|Y|O|0|0|6|5|0|M|6|0|0^^$0|$1|$2|3|4|5|6|$7|8]]]|9|@$A|B|C|D|2|E|F|1A|G|@]|H|@]|6|$]]|$A|I|C|J|2|E|F|1B|G|@]|H|@]|6|$]]|$A|K|C|L|2|E|F|1C|G|@]|H|@]|6|$]]|$A|M|C|N|2|E|F|1D|G|@$O|1E|P|1F|Q|R]]|H|@]|6|$]]|$A|S|C|T|2|U|F|1G|G|@]|H|@]|6|$V|W]]|$A|X|C|Y|2|E|F|1H|G|@]|H|@$O|1I|P|1J|A|1K]]|6|$]]|$A|Z|C|10|2|E|F|1L|G|@$O|1M|P|1N|Q|R]|$O|1O|P|1P|Q|R]]|H|@]|6|$]]|$A|11|C|12|2|U|F|1Q|G|@]|H|@]|6|$V|W]]|$A|13|C|14|2|E|F|1R|G|@$O|1S|P|1T|Q|R]]|H|@]|6|$]]|$A|15|C|16|2|E|F|1U|G|@$O|1V|P|1W|Q|R]]|H|@]|6|$]]|$A|17|C|18|2|U|F|1X|G|@]|H|@]|6|$V|W]]|$A|19|C|-4|2|E|F|1Y|G|@]|H|@]|6|$]]]]

At run time your original code under test would still work because of the implicit conversion.

But based on the provided debugger image it looks like the test was asserting on the wrong property of the result.

So while changing the method under test allowed the test to pass, it would have worked when run live either way

<code>ActioResult&lt;TValue&gt;</code> has two properties that are set depending on what is returned from the action that uses it.

<pre><code>/// &lt;summary&gt;
/// Gets the &lt;see cref="ActionResult"/&gt;.
/// &lt;/summary&gt;
public ActionResult Result { get; }

/// &lt;summary&gt;
/// Gets the value.
/// &lt;/summary&gt;
public TValue Value { get; }
</code></pre>

<a href="https://github.com/aspnet/Mvc/blob/master/src/Microsoft.AspNetCore.Mvc.Core/ActionResultOfT.cs" rel="noreferrer">Source</a>

So when the controller action returned using <code>Ok()</code> it would set the <code>ActionResult&lt;int&gt;.Result</code> property of the action result via implicit conversion.

<pre><code>public static implicit operator ActionResult&lt;TValue&gt;(ActionResult result)
{
 return new ActionResult&lt;TValue&gt;(result);
}
</code></pre>

But the test was asserting the <code>Value</code> property (refer to image in OP), which in this case was not being set.

Without having to modify the code under test to satisfy the test it could have accessed the <code>Result</code> property and make assertions on that value

<pre><code>[Fact]
public async Task GetLocationsCountAsync_WhenCalled_ReturnsLocationsCount() {
 //Arrange
 _locationsService
 .Setup(_ =&gt; _.GetLocationsCountAsync(It.IsAny&lt;string&gt;()))
 .ReturnsAsync(10);
 var controller = new LocationsController(_locationsService.Object, null) {
 ControllerContext = { HttpContext = SetupHttpContext().Object }
 };

 //Act
 var actionResult = await controller.GetLocationsCountAsync();

 //Assert
 var result = actionResult.Result as OkObjectResult;
 result.Should().NotBeNull();
 result.Value.Should().Be(10);

 VerifyAll();
}
</code></pre>

entityMap|0|type|LINK|mutability|MUTABLE|data|url|https://docs.microsoft.com/en-us/aspnet/core/web-api/action-return-types?view=aspnetcore-2.2#actionresultt-type|blocks|key|2nrnj|text|问题是把它包装在Ok中。如果返回对象本身，则会正确填充Value。|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|7vh3j|如果您查看Microsoft's+examples+in+the+docs，您会发现它们只对NotFound等非默认响应使用控制器方法|8c7rr|[HttpGet("{id}")]
[ProducesResponseType(StatusCodes.Status404NotFound)]
public+ActionResult<Product>+GetById(int+id)
{
++++if+(!_repository.TryGetProduct(id,+out+var+product))
++++{
++++++++return+NotFound();
++++}

++++return+product;
}|code-block|syntax|javascript|1jnlh^0|8|2|R|5|0|1A|8|5|W|0|0|0^^$0|$1|$2|3|4|5|6|$7|8]]]|9|@$A|B|C|D|2|E|F|U|G|@$H|V|I|W|J|K]|$H|X|I|Y|J|K]]|L|@]|6|$]]|$A|M|C|N|2|E|F|Z|G|@$H|10|I|11|J|K]]|L|@$H|12|I|13|A|14]]|6|$]]|$A|O|C|P|2|Q|F|15|G|@]|L|@]|6|$R|S]]|$A|T|C|-4|2|E|F|16|G|@]|L|@]|6|$]]]]

The issue is wrapping it in <code>Ok</code>. If you return the object itself, <code>Value</code> is populated correctly.

If you look at <a href="https://docs.microsoft.com/en-us/aspnet/core/web-api/action-return-types?view=aspnetcore-2.2#actionresultt-type" rel="noreferrer">Microsoft's examples in the docs</a>, they only use the controller methods for non-default responses like <code>NotFound</code>:

<pre><code>[HttpGet("{id}")]
[ProducesResponseType(StatusCodes.Status404NotFound)]
public ActionResult&lt;Product&gt; GetById(int id)
{
 if (!_repository.TryGetProduct(id, out var product))
 {
 return NotFound();
 }

 return product;
}
</code></pre>

entityMap|blocks|key|acdi8|text|问题出在ActionResult<T>令人困惑的接口上，这个接口从来没有设计成供我们人类使用。正如在其他答案中所述，ActionResult<T>设置了Result或Value属性，但不能同时设置这两个属性。当您返回一个OkObjectResult时，框架会填充Result属性。当您返回一个对象时，框架会填充Value属性。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|d9cte|我为我的测试库创建了以下简单的帮助器，以帮助我在使用OkObjectResult+Ok()或其他从ObjectResult继承的结果时测试返回值|c4dcd|private+static+T+GetObjectResultContent<T>(ActionResult<T>+result)
{
++++return+(T)+((ObjectResult)+result.Result).Value;
}|code-block|syntax|javascript|6dd79|这使我可以执行以下操作：|bp56e|var+actionResult+=+await+controller.Get("foobar");
Assert.IsType<OkObjectResult>(actionResult.Result);
var+resultObject+=+GetObjectResultContent<ObjectType>(actionResult);
Assert.Equal("foobar",+resultObject.Id);|247kb^0|4|F|1M|F|24|6|2B|5|32|E|3N|6|4B|5|0|Q|J|1D|C|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|S|9|@$A|T|B|U|C|D]|$A|V|B|W|C|D]|$A|X|B|Y|C|D]|$A|Z|B|10|C|D]|$A|11|B|12|C|D]|$A|13|B|14|C|D]|$A|15|B|16|C|D]]|E|@]|F|$]]|$2|G|4|H|6|7|8|17|9|@$A|18|B|19|C|D]|$A|1A|B|1B|C|D]]|E|@]|F|$]]|$2|I|4|J|6|K|8|1C|9|@]|E|@]|F|$L|M]]|$2|N|4|O|6|7|8|1D|9|@]|E|@]|F|$]]|$2|P|4|Q|6|K|8|1E|9|@]|E|@]|F|$L|M]]|$2|R|4|-4|6|7|8|1F|9|@]|E|@]|F|$]]]]

The problem lies in the confusing interface of <code>ActionResult&lt;T&gt;</code> that was never designed to be used by us humans. As stated in other answers, <code>ActionResult&lt;T&gt;</code> has either its <code>Result</code> or <code>Value</code> property set but not both. When you return an <code>OkObjectResult</code> the framework populates the <code>Result</code> property. When you return an object the framework populates the <code>Value</code> property.
I created the following simple helper for my test library to help me test the return values when I am using <code>OkObjectResult Ok()</code> or other results inheriting from <code>ObjectResult</code>
<pre><code>private static T GetObjectResultContent&lt;T&gt;(ActionResult&lt;T&gt; result)
{
 return (T) ((ObjectResult) result.Result).Value;
}
</code></pre>
This lets me do the following:
<pre><code>var actionResult = await controller.Get(&quot;foobar&quot;);
Assert.IsType&lt;OkObjectResult&gt;(actionResult.Result);
var resultObject = GetObjectResultContent&lt;ObjectType&gt;(actionResult);
Assert.Equal(&quot;foobar&quot;, resultObject.Id);
</code></pre>

entityMap|0|type|LINK|mutability|MUTABLE|data|url|https://github.com/dotnet/aspnetcore/blob/master/src/Mvc/Mvc.Core/src/ActionResultOfT.cs|1|https://github.com/dotnet/aspnetcore/blob/master/src/Mvc/Mvc.Core/src/ActionResultOfT.cs#L77|blocks|key|7imvr|text|作为@Nkosi和@Otto+Teinonen提供的答案的延续，有一个可以与Value/Result相互转换的implicit+opertator|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|e6l0g|此外，ActionResult<TValue>还实现了接口IConvertToActionResult|clpo1|++public+sealed+class+ActionResult<TValue>+:+IConvertToActionResult|code-block|syntax|javascript|9esfl|并提供基于空值同时处理Result和Value的Convert方法，请参阅source并返回非空值。设置了Result或Value。|dsp75|如果控制器没有返回Ok(value)，使用OkObjectResult可能会返回null并导致测试失败，如下所示：|bsavb|+var+result+=+actionResult.Result+as+OkObjectResult;+//may+be+null|a8m2j|下一个扩展方法同时处理结果和值，并返回类型化对象T|5evtn|public+static+T+GetObjectResult<T>(this+ActionResult<T>+result)
++++++++{
++++++++++++if+(result.Result+!=+null)
++++++++++++++++return+(T)((ObjectResult)result.Result).Value;
++++++++++++return+result.Value;++++++++++++
++++++++}|f1qi4|测试用例|906dr|[Test]
public+async+Task+Test()
{
++++var+controller+=+new+ProductsController(Repo);
++++var+result+=+await+controller.GetProduct(1);
++++await+Repo.Received().GetProduct(1);
+++++//result.Result.Should().BeOfType<OkObjectResult>();++//+may+fail+if+controller+didn't+return+Ok(value)
+++++result.GetObjectResult().ProductId.Should().Equals(1);
+}|2dm98^0|12|C|1J|I|0|0|3|K|T|M|0|0|B|6|I|5|O|7|1H|6|1O|5|11|6|1|0|9|9|L|E|0|0|0|0|0|0^^$0|$1|$2|3|4|5|6|$7|8]]|9|$2|3|4|5|6|$7|A]]]|B|@$C|D|E|F|2|G|H|1A|I|@$J|1B|K|1C|L|M]]|N|@$J|1D|K|1E|C|1F]]|6|$]]|$C|O|E|P|2|G|H|1G|I|@$J|1H|K|1I|L|M]|$J|1J|K|1K|L|M]]|N|@]|6|$]]|$C|Q|E|R|2|S|H|1L|I|@]|N|@]|6|$T|U]]|$C|V|E|W|2|G|H|1M|I|@$J|1N|K|1O|L|M]|$J|1P|K|1Q|L|M]|$J|1R|K|1S|L|M]|$J|1T|K|1U|L|M]|$J|1V|K|1W|L|M]]|N|@$J|1X|K|1Y|C|1Z]]|6|$]]|$C|X|E|Y|2|G|H|20|I|@$J|21|K|22|L|M]|$J|23|K|24|L|M]]|N|@]|6|$]]|$C|Z|E|10|2|S|H|25|I|@]|N|@]|6|$T|U]]|$C|11|E|12|2|G|H|26|I|@]|N|@]|6|$]]|$C|13|E|14|2|S|H|27|I|@]|N|@]|6|$T|U]]|$C|15|E|16|2|G|H|28|I|@]|N|@]|6|$]]|$C|17|E|18|2|S|H|29|I|@]|N|@]|6|$T|U]]|$C|19|E|-4|2|G|H|2A|I|@]|N|@]|6|$]]]]

As a continuation to the answer provided by @Nkosi and @Otto Teinonen,
there is an <a href="https://github.com/dotnet/aspnetcore/blob/master/src/Mvc/Mvc.Core/src/ActionResultOfT.cs" rel="noreferrer">implicit opertator</a> to convert to/from <code>Value/Result</code>
Also, <code>ActionResult&lt;TValue&gt;</code> implement the interface <code>IConvertToActionResult</code>
<pre><code> public sealed class ActionResult&lt;TValue&gt; : IConvertToActionResult
</code></pre>
and provide <code>Convert</code> method that handle both <code>Result</code> and <code>Value</code> based on their null values, see the <a href="https://github.com/dotnet/aspnetcore/blob/master/src/Mvc/Mvc.Core/src/ActionResultOfT.cs#L77" rel="noreferrer">source</a> and return the non null value. Either <code>Result</code> or <code>Value</code> is set.
If the Controler didn't return <code>Ok(value)</code>, using <code>OkObjectResult</code> may return null and cause test fail, like:
<pre><code> var result = actionResult.Result as OkObjectResult; //may be null
</code></pre>
The next extension method handle both Result and Value and return the typed object T
<pre class="lang-cs prettyprint-override"><code>public static T GetObjectResult&lt;T&gt;(this ActionResult&lt;T&gt; result)
 {
 if (result.Result != null)
 return (T)((ObjectResult)result.Result).Value;
 return result.Value; 
 }
</code></pre>
Test case
<pre><code>[Test]
public async Task Test()
{
 var controller = new ProductsController(Repo);
 var result = await controller.GetProduct(1);
 await Repo.Received().GetProduct(1);
 //result.Result.Should().BeOfType&lt;OkObjectResult&gt;(); // may fail if controller didn't return Ok(value)
 result.GetObjectResult().ProductId.Should().Equals(1);
 }
</code></pre>

entityMap|blocks|key|9kfi5|text|另一种方法是序列化，然后在json类型中反序列化：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|dutc3|[Fact]
public+void+Test1()
{
++++var+controller+=+new+ProductController();
++++var+result+=+controller.Products();
++++var+okResult+=+Assert.IsType<OkObjectResult>(result);
++++if+(okResult.Value+==+null)+return;
++++var+json+=+JsonConvert.SerializeObject(okResult.Value);
++++var+values+=+JsonConvert.DeserializeObject<Product>(json);
++++if+(values+!=+null)+Assert.Equal(1,+values.Id);
}

private+class+Product
{
++++public+int+Id+{+get;+set;+}
++++public+string+Name+{+get;+set;+}
}

[Route("api/product")]
[ApiController]
public+class+ProductController+:+ControllerBase
{
++++[HttpGet]
++++public+IActionResult+Products()+=>+Ok(new+{+Id+=+1,+Name+=+"Smartphone"+});
}|code-block|syntax|javascript|1hn9p^0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|I|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|J|9|@]|A|@]|B|$F|G]]|$2|H|4|-4|6|7|8|K|9|@]|A|@]|B|$]]]]

Another method would be to serialize and then desalize in json type:
<pre class="lang-cs prettyprint-override"><code>[Fact]
public void Test1()
{
 var controller = new ProductController();
 var result = controller.Products();
 var okResult = Assert.IsType&lt;OkObjectResult&gt;(result);
 if (okResult.Value == null) return;
 var json = JsonConvert.SerializeObject(okResult.Value);
 var values = JsonConvert.DeserializeObject&lt;Product&gt;(json);
 if (values != null) Assert.Equal(1, values.Id);
}

private class Product
{
 public int Id { get; set; }
 public string Name { get; set; }
}

[Route(&quot;api/product&quot;)]
[ApiController]
public class ProductController : ControllerBase
{
 [HttpGet]
 public IActionResult Products() =&gt; Ok(new { Id = 1, Name = &quot;Smartphone&quot; });
}
</code></pre>

I have a xUnit test like:

<pre><code>[Fact]
public async void GetLocationsCountAsync_WhenCalled_ReturnsLocationsCount()
{
 _locationsService.Setup(s =&gt; s.GetLocationsCountAsync("123")).ReturnsAsync(10);
 var controller = new LocationsController(_locationsService.Object, null)
 {
 ControllerContext = { HttpContext = SetupHttpContext().Object }
 };
 var actionResult = await controller.GetLocationsCountAsync();
 actionResult.Value.Should().Be(10);
 VerifyAll();
}
</code></pre>

Source is

<pre><code>/// &lt;summary&gt;
/// Get the current number of locations for a user.
/// &lt;/summary&gt;
/// &lt;returns&gt;A &lt;see cref="int"&gt;&lt;/see&gt;.&lt;/returns&gt;
/// &lt;response code="200"&gt;The current number of locations.&lt;/response&gt;
[HttpGet]
[Route("count")]
public async Task&lt;ActionResult&lt;int&gt;&gt; GetLocationsCountAsync()
{
 return Ok(await _locations.GetLocationsCountAsync(User.APropertyOfTheUser()));
}
</code></pre>

The value of the result is null, causing my test to fail, but if you look at <code>ActionResult.Result.Value</code> (an internal property) it contains the expected resolved value.

See the following screen capture of the debugger.
<a href="https://i.stack.imgur.com/MscJr.png" rel="noreferrer"><img src="https://i.stack.imgur.com/MscJr.png" alt="enter image description here"></a>

How do I get the actionResult.Value to populate in a unit test?

How to Unit Test with ActionResult<T>?

单元测试

调试器

 我有一个xUnit测试，如下所示： [Fact]public async void GetLocationsCountAsync_WhenCalled_ReturnsLocationsCount(){    _locationsService.Setup(s => s.GetLocationsCountAsync("...

问如何使用ActionResult<T>进行单元测试？
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