# Unittest 程式筆記
###### tags: `C#` `待更新`

## C# "internal" access modifier when doing unit testing???
https://stackoverflow.com/questions/358196/c-sharp-internal-access-modifier-when-doing-unit-testing

https://dotblogs.com.tw/hatelove/2012/11/09/learning-tdd-in-30-days-day4-why-you-should-not-write-unit-test-with-private-and-protected-method

## NSubstitute
[NSubstitute 官方文件](https://nsubstitute.github.io/)
[NSubstitute 基本介紹-3](https://ithelp.ithome.com.tw/articles/10267165)

//Create:
var calculator = Substitute.For<ICalculator>();

//Set a return value:
calculator.Add(1, 2).Returns(3);
Assert.AreEqual(3, calculator.Add(1, 2));

//Check received calls:
calculator.Received().Add(1, Arg.Any<int>());
calculator.DidNotReceive().Add(2, 2);

//Raise events
calculator.PoweringUp += Raise.Event();

### exception
[Throwing exceptions 官方文件](https://nsubstitute.github.io/help/throwing-exceptions/)
[NSubstitute - make async method (Task) throw an exception](https://blog.krusen.dk/nsubstitute-make-async-method-throw)

//For non-voids:
calculator.Add(-1, -1).Returns(x => { throw new Exception(); });

//For voids and non-voids:
calculator
    .When(x => x.Add(-2, -2))
    .Do(x => { throw new Exception(); });

Assert.Throws<Exception>(() => calculator.Add(-1, -1));
var exception = Assert.ThrowsAsync<Exception>(() => calculator.AddAsync(-2, -2));

### Received

_accountService.Received().GetAccount("AccountId"));
_accountService.Received().AccountFolter(Arg.Any<AccountFilterRequest>()));
//也可以測物件內部的值
_accountService.Received().AccountFolter(Arg.Is<AccountFilterRequest>(x=>
    x.country == "TW" 
    && x.Age < 18 
    && IsAddressInfo(x.AddressInfo, "Taipei", "road"))));

//received could use ToExpectedObject check sub object
private bool IsAddressInfo(AddressInfo addressInfo, string country, string road)
{
    var expectedObject = new {Country = country,Road = road}.ToExpectedObject();
    return expectedObject.Matches(addressInfo);
}

#### 相關文件
[Argument matchers 官方文件](https://nsubstitute.github.io/help/argument-matchers/)
[NSubstitute with object as parameter in Received call](https://stackoverflow.com/a/14582094/19304838)

## ExpectedObjects
nuget package install ExpectedObjects
目前版本 collection 是不關心順序的，若順序是重要的可以在創建 ToExpectedObjects 時設置

var expected = new TypeWithIEnumerable
  {
    Objects = new List<string> {"test2", "test1"}
  }.ToExpectedObject(ctx => ctx.UseOrdinalComparison());

[Compare Object Equality](https://dotblogs.com.tw/hatelove/2016/03/28/compare-object-equality-with-expected-objects)
[Collections](https://github.com/derekgreer/expectedObjects/wiki/Collections)
[expectedObjects gitlab](https://github.com/derekgreer/expectedObjects)

## ModelState.IsValid unitest 不會檢查???
目前測起來是這樣

## test IActionResult Method

[Test]
public void Create()
{
    var actionResult = new TestPlayerController(testPlayerService).Create(new CreateTestPlayerDto());
    var okResult = actionResult as OkObjectResult;

    Assert.AreEqual("OK", okResult?.Value);
    Assert.IsTrue(okResult.Value is string);
    Assert.AreEqual(200, okResult?.StatusCode);
}

[Unit testing controller methods which return IActionResult](https://stackoverflow.com/questions/41292919/unit-testing-controller-methods-which-return-iactionresult)
[Unit test controller logic in ASP.NET Core](https://learn.microsoft.com/en-us/aspnet/core/mvc/controllers/testing?view=aspnetcore-7.0)

## ILogger in unit test
### 法一： mock ILogger

public void Setup()
{
    var logger = Substitute.For<ILogger<TargetController>>();
    _targetController = new TargetController(logger);
}

### 法二： LoggerFactory create console log

public void Setup()
{
    using var loggerFactory = LoggerFactory.Create(builder => builder.AddConsole());
    var logger = loggerFactory.CreateLogger<TargetController>();
    _targetController = new TargetController(logger);
}

### 法三： Replace ILogger with NullLogger

public void Setup()
{
    var logger = new NullLogger<TargetController>();
    _targetController = new TargetController(logger);
}

### 相關文章
[Unit Testing with `ILogger<T>`](https://www.cnblogs.com/microestc/p/14202882.html)

## Unit Test and Mock Automapper ASP.NET Core ???(待更新)
[Unit Test and Mock Automapper ASP.NET Core](https://www.thecodebuzz.com/unit-test-mock-automapper-asp-net-core-imapper/)