Library with class which covers common testing issues below.
- Any testing helper should limit the testing scope to a single class only.
- Changes to a constructor of a class should not require editing all tests for that class.
- Boilerplate code within the test class should be kept to a minimum.
dotnet add package AutoTesting
To show you how the testing context works, we’ll create a quick couple of test classes.
public interface ITestRepository
{
List<string> GetNames();
}
public class TestRepository : ITestRepository
{
public List<string> GetNames()
{
return new List<string>
{
"John",
"Bob",
"Wade"
};
}
}
public interface ITestService
{
List<string> GetNamesExceptJohn();
}
public class TestService : ITestService
{
private readonly ITestRepository _testRepository;
private readonly UtilityService _utilityService;
public TestService(ITestRepository testRepository, UtilityService utilityService)
{
_testRepository = testRepository;
_utilityService = utilityService;
}
public List<string> GetNamesExceptJohn()
{
return _testRepository.GetNames().Where(x => !x.Equals("john", StringComparison.CurrentCultureIgnoreCase)).ToList();
}
public List<string> GetPalindromeNames()
{
return _testRepository.GetNames().Where(x => _utilityService.IsPalindrome(x)).ToList();
}
}
public class UtilityService
{
public bool IsPalindrome(string word)
{
return word == string.Join(string.Empty, word.ToCharArray().Reverse());
}
}Now onto the tests in (xUnit). Our first test looks like so :
public class TestService_Tests : TestingContext<TestService>
{
[Fact]
public void WhenGetNamesExceptJohnCalled_JohnIsNotReturned()
{
Mock<ITestRepository>().Setup(x => x.GetNames()).Returns(new List<string> { "bob", "john" });
var result = TestObject.GetNamesExceptJohn();
Assert.IsNotNull(result);
Assert.AreEqual(1, result.Count);
Assert.AreEqual("bob", result.First());
}
}More information and usecases in article: https://dotnetcoretutorials.com/2018/05/12/the-testing-context/