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How to rewrite unittest not to test actual work with database, but works only with mocks
void Main()
{
// add NUnit and RhinoMocks
SomeRule_InsertInfo_WasInserted();
SomeRule_GetInfo_ReciveCorrectInfo();
}
// DTO
public class Info
{
public int Id { get; set; }
public string Desc { get; set; }
}
// Repository incapsulates work with Database
public abstract class Repository<T>
where T : class
{
public abstract void Save(T entity);
public abstract IEnumerable<T> GetAll();
}
// Class under Test
public class SomeRule
{
private readonly Repository<Info> repository;
public SomeRule(Repository<Info> repository)
{
this.repository = repository;
}
public int InsertInfoToDb(Info oInfo)
{
repository.Save(oInfo);
return oInfo.Id;
}
public Info GetInfoFromDb(int id)
{
return repository.GetAll().Single(info => info.Id == id);
}
}
// Actual unittests
[Test]
public void SomeRule_InsertInfo_WasInserted() // ex. InsertInfo
{
// Arrange
Info oInfo = new Info();
oInfo.Desc = "Some Description here !!!";
var repositoryMock = MockRepository.GenerateStrictMock<Repository<Info>>();
repositoryMock.Expect(m => m.Save(Arg<Info>.Is.NotNull));
// Act
var savedrecordid = new SomeRule(repositoryMock).InsertInfoToDb(oInfo);
// Assert
repositoryMock.VerifyAllExpectations();
}
[Test]
public void SomeRule_GetInfo_ReciveCorrectInfo() // ex. GetInfo
{
// Arrange
var expectedId = 1;
var expectedInfo = new Info { Id = expectedId, Desc = "Something" };
var repositoryMock = MockRepository.GenerateStrictMock<Repository<Info>>();
repositoryMock.Expect(m => m.GetAll()).Return(new [] { expectedInfo }.AsEnumerable());
// Act
Info receivedInfo = new SomeRule(repositoryMock).GetInfoFromDb(expectedId);
// Assert
repositoryMock.VerifyAllExpectations();
Assert.That(receivedInfo, Is.Not.Null.And.SameAs(expectedInfo));
}
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