private static IEnumerable <MethodInfoWithLevel> GetMethodsInfos(TestStringCalculator testFixture)
{
var methodsInfos = testFixture.GetType()
.GetMethods(BindingFlags.Public | BindingFlags.Instance)
.Select(mi =>
{
var testStepAttribute = mi.GetCustomAttributes().OfType <TestStepAttribute>().ToArray();
if (!testStepAttribute.Any())
{
return(null);
}
var level = testStepAttribute.First().StepNumber;
return(new MethodInfoWithLevel(mi, level));
});
return(methodsInfos.Where(mi => mi != null));
}
public void ExistingDataImplementations_ShouldAllPassCorrespondingTestLevelInDataTests()
{
//---------------Set up test pack-------------------
var testFixture = new TestStringCalculator();
var methodsInfos = GetMethodsInfos(testFixture);
var implementations = GetDataImplementations();
Func <int, IStringCalculator> GetInstanceOfImplementationAtLevel = (level) =>
{
var matchingType = implementations.FirstOrDefault(i => i.Level == level);
if (matchingType == null)
{
return(null);
}
return((IStringCalculator)Activator.CreateInstance(matchingType.Type));
};
//---------------Assert Precondition----------------
//---------------Execute Test ----------------------
var failed = methodsInfos.Aggregate(new List <int>(), (f, method) =>
{
var instanceOfImplementationAtLevel = GetInstanceOfImplementationAtLevel(method.Level);
if (instanceOfImplementationAtLevel == null)
{
return(f);
}
try
{
testFixture.CreateSUT = () => instanceOfImplementationAtLevel;
method.MethodInfo.Invoke(testFixture, null);
}
catch (Exception)
{
f.Add(method.Level);
}
return(f);
});
//---------------Test Result -----------------------
var distinct = failed.Distinct().ToArray();
if (distinct.Any())
{
Assert.Fail("The following levels have crap implementations: " + string.Join(",", distinct));
}
}
public void DataTestFixture_ShouldHaveCorrespondingDataImplementationsForAllTestLevels()
{
//---------------Set up test pack-------------------
var testFixture = new TestStringCalculator();
var methodsInfos = GetMethodsInfos(testFixture);
var implementations = GetDataImplementations();
Func <int, IStringCalculator> GetInstanceOfImplementationAtLevel = (level) =>
{
var matchingType = implementations.FirstOrDefault(i => i.Level == level);
if (matchingType == null)
{
return(null);
}
return((IStringCalculator)Activator.CreateInstance(matchingType.Type));
};
//---------------Assert Precondition----------------
//---------------Execute Test ----------------------
var dontHaveImplementationsFor = methodsInfos.Aggregate(new List <int>(), (implementationLevelsNotFoundFor, method) =>
{
var instanceOfImplementationAtLevel = GetInstanceOfImplementationAtLevel(method.Level);
if (instanceOfImplementationAtLevel == null)
{
implementationLevelsNotFoundFor.Add(method.Level);
}
return(implementationLevelsNotFoundFor);
});
//---------------Test Result -----------------------
var distinct = dontHaveImplementationsFor.Distinct().ToArray();
if (distinct.Any())
{
Assert.Fail("The following levels have no implementations: " + string.Join(",", distinct));
}
}