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Mock.Verify() failed - This setup was not matched?

I have the following test code.
var test = "Test";
var command = new MyCommand { V = test };
var mock = new Mock<IRepository>(); // IRepository has the method of Save()
var p = new P(test);
mock.Setup(x => x.Save(p)).Verifiable();
var sut = new C(mock.Object);
var result = await sut.M(command);
mock.Verify();
The test should pass. However, it failed with the error of,
Message:
Moq.MockException : Mock:
This mock failed verification due to the following:
IRepository x => x.Save(P):
This setup was not matched.
Stack Trace:
Mock.Verify()
sut.M() will convert a string X to type P with value of P(X).

It seems to me that you want to verify that the Save method from your mock is called with a specific value, and not just a type.
I have tried something like the following and believe it should work. I have modified your example.
var test = "Test";
var command = new MyCommand { V = test };
var mock = new Mock<IRepository>(); // IRepository has the method of Save()
var p = new P(test);
mock.Setup(x => x.Save(It.IsAny<P>());
var sut = new C(mock.Object);
var result = await sut.M(command);
mock.Verify(x => x.Save(It.Is<P>(v => v.Value.Equals(p.Value))), Times.AtLeastOnce);
This tests that the values of the specific property are equal.
I Tested this with the following test:
var test = "Test";
var mock = new Mock<ITestRepository>(); // ITestRepository has the method of Save()
var p = new P(test);
mock.Setup(x => x.Save(It.IsAny<P>()));
mock.Object.Save(new P(test));
mock.Verify(x => x.Save(It.Is<P>(v => v.Value.Equals(p.Value))), Times.AtLeastOnce);

Unit Testing xUnit Asserting 2 Collections with Moq Interface

Good day everyone,
I'm new in xunit and even in unit testing. I have a code here and I'm trying to assert two collection of list. But I have no idea how to assert and pass this test. Here's my code
[Theory]
[InlineData(1)]
public void GetAllStudents_Exempt1(int number)
{
// arrange
var studentRepo = new Mock<IStudentRepository>();
var listOfStudents = new List<Student> { new Student { StudentId = 1, Firstname = "Firstname1", Lastname = "Firstname1" },
new Student{StudentId=2, Firstname="Firstname2",Lastname="Lastname2"} };
var getAllStudentDetailsExempt1 = studentRepo.Setup(s => s.GetStudents()).Returns(listOfStudents.Where(x => x.StudentId != number));
var studentService = new StudentService(studentRepo.Object);
// act
var getStudentsDetails = studentService.ListOfStudentsExempt1(1);
// assert
// I don't have any idea how to assert
}

First a few notes:
var getAllStudentDetailsExempt1 = studentRepo
.Setup(s => s.GetStudents())
.Returns(listOfStudents.Where(x => x.StudentId != number));
you don't need var getAllStudentDetailsExempt1, you can just setup your repo-mock...
studentRepo
.Setup(s => s.GetStudents())
.Returns(listOfStudents.Where(x => x.StudentId != number));
You probably want to change:
// act
var getStudentsDetails = studentService.ListOfStudentsExempt1(1);
to use the number variable...
// act
var getStudentsDetails = studentService.ListOfStudentsExempt1(number);
So then you can assert by checking some properties:
Assert.Equals(1, getStudentsDetails.Count);
Assert.Equals("FirstName1", getStudentsDetails.First().Firstname);
etc. etc.
Give it a shot!

Count files from request with Moq

The SetupGet for Form work, but the Count not work. How to resolve to Count return the value expected?
var httpContextMock = new Mock<HttpContextBase>();
var request = new Mock<HttpRequestBase>();
httpContextMock.SetupGet(x => x.Request).Returns(request.Object);
httpContextMock.SetupGet(x => x.Request.Form).Returns(form);
httpContextMock.SetupGet(x => x.Request.Files.Count).Returns(2);

It is not working because you are setting up the wrong mock. Apply the setup on the request mock.
var httpContextMock = new Mock<HttpContextBase>();
var requestMock = new Mock<HttpRequestBase>();
requestMock.Setup(_ => _.Form).Returns(form);
requestMock.Setup(_ => _.Files.Count).Returns(2);
httpContextMock.Setup(_ => _.Request).Returns(requestMock.Object);
Just to prove the above works, I tested it like this
var context = httpContextMock.Object;
Assert.AreEqual(2, context.Request.Files.Count);
and it worked.

I did a quick test and it works if you access the request through the mock context.
[Test()]
public void Test()
{
var httpContextMock = new Mock<HttpContextBase>();
var request = new Mock<HttpRequestBase>();
httpContextMock.SetupGet(x => x.Request).Returns(request.Object);
httpContextMock.SetupGet(x => x.Request.Files.Count).Returns(2);
var count = httpContextMock.Object.Request.Files.Count;
Assert.AreEqual(2, count);
}
As Nkosi suggested, however, you probably wanted to setup Files.Count on the requestMock itself.

Why is my Moq not returning null?

My Moq is returning data I don't expect.
var artist = new Artist();
artist.Id = "4576";
var deserializer = Mock.Of<IXmlDeserializer<Album>>(
d => d.Deserialize("foo").Artist == artist);
Assert.IsNull(deserializer.Deserialize(null));
The above test fails.
The really puzzling thing is that the mock returns a Mock but that
Assert.AreEqual("4576", deserializer.Deserialize(null).Artist.Id)
returns true.
It's as if the "default" returned by my mock for an unspecified argument (in this case null) was somehow influenced by what I told it to return when called with "foo".

You can either write:
var artist = new Artist { Id = "4576" };
var mock = new Mock<IXmlDeserializer<Album>>();
mock.Setup(x => x.Deserialize(It.Is<string>(i => i == "foo"))).Returns(new Album() { Artist = artist });
var deserializer = mock.Object;
Assert.IsNull(deserializer.Deserialize(null));
Assert.IsNotNull(deserializer.Deserialize("foo"));
Or using the Mock.Of() syntax the above would be:
var artist = new Artist { Id = "4576" };
var deserializer = Mock.Of<IXmlDeserializer<Album>>(d => d.Deserialize(It.Is<string>(i => i == "foo")) == Mock.Of<Album>(album => album.Artist == artist));
Assert.IsNull(deserializer.Deserialize(null));
Assert.IsNotNull(deserializer.Deserialize("foo"));
Assert.AreEqual("4576", deserializer.Deserialize("foo").Artist.Id);

Automapper - RecognizePrefixes doesn't work

I have need to map PriorityId -> TcTaskPriorityId
Mapper.Configuration.RecognizePrefixes("TcTask");
Mapper.CreateMap<Task, TpTasksEntity>();
Task t = new Task{PriorityId = 1};
var te = Mapper.Map<Task, TpTasksEntity>(t);
It just does not work.

The RecognizePrefixes works for source object prefixes, i.e.:
Mapper.Configuration.RecognizePrefixes("TcTask");
Mapper.CreateMap<Task, TpTasksEntity>();
Task t = new Task { TcTaskPriorityId = 1 };
var te = Mapper.Map<Task, TpTasksEntity>(t);
For your scenario you could write a custom naming convention:
Mapper.Configuration.SourceMemberNameTransformer = s => "TcTask" + s;
Mapper.CreateMap<Task, TpTasksEntity>();
Task t = new Task { PriorityId = 1 };
var te = Mapper.Map<Task, TpTasksEntity>(t);

Use RecognizeDestinationPrefixes method.

Can you try:
Mapper.Initialize(cfg => {
cfg.RecognizePrefixes("TcTask");
cfg.CreateMap<Task, TpTasksEntity>();
});