private static AggregatedDifference ValueDifference <TA, TE>(TA actual, string firstName, TE expected, int refIndex, ICollection <object> firstSeen)
{
var result = new AggregatedDifference();
if (expected == null)
{
if (actual != null)
{
result.Add(DifferenceDetails.DoesNotHaveExpectedValue(firstName, actual, expected, refIndex));
}
return(result);
}
if (expected.Equals(actual))
{
return(result);
}
if (actual != null)
{
var commonType = actual.GetType().FindCommonNumericalType(expected.GetType());
// we silently convert numerical value
if (commonType != null)
{
var convertedActual = Convert.ChangeType(actual, commonType);
var convertedExpected = Convert.ChangeType(expected, commonType);
if (convertedExpected.Equals(convertedActual))
{
return(result);
}
}
if (firstSeen.Contains(actual))
{
result.Add(DifferenceDetails.DoesNotHaveExpectedValue(firstName, actual, expected, 0));
return(result);
}
firstSeen = new List <object>(firstSeen)
{
actual
};
if (actual.IsAnEnumeration(false) && expected.IsAnEnumeration(false))
{
return(ValueDifferenceEnumerable(actual as IEnumerable, firstName, expected as IEnumerable, firstSeen));
}
}
result.Add(DifferenceDetails.DoesNotHaveExpectedValue(firstName, actual, expected, refIndex));
return(result);
}
private static AggregatedDifference NumericalValueDifference <TA, TE>(TA actual, string firstName, TE expected,
int refIndex, Type commonType, AggregatedDifference result)
{
var convertedActual = Convert.ChangeType(actual, commonType);
var convertedExpected = Convert.ChangeType(expected, commonType);
if (convertedExpected.Equals(convertedActual))
{
return(result);
}
result.Add(DifferenceDetails.DoesNotHaveExpectedValue(firstName, actual, expected, refIndex));
return(result);
}
private static AggregatedDifference ValueDifferenceArray(Array firstArray, string firstName, Array secondArray, ICollection <object> firstSeen)
{
var valueDifferences = new AggregatedDifference();
if (firstArray.Rank != secondArray.Rank)
{
valueDifferences.Add(DifferenceDetails.DoesNotHaveExpectedValue(firstName + ".Rank", firstArray.Rank, secondArray.Rank, 0));
return(valueDifferences);
}
for (var i = 0; i < firstArray.Rank; i++)
{
if (firstArray.SizeOfDimension(i) == secondArray.SizeOfDimension(i))
{
continue;
}
valueDifferences.Add(DifferenceDetails.DoesNotHaveExpectedValue($"{firstName}.Dimension({i})",
firstArray.SizeOfDimension(i),
secondArray.SizeOfDimension(i),
i));
return(valueDifferences);
}
var indices = new int[firstArray.Rank];
var secondIndices = new int[secondArray.Rank];
for (var i = 0; i < firstArray.Length; i++)
{
var temp = i;
var label = new StringBuilder("[");
for (var j = 0; j < firstArray.Rank; j++)
{
var currentIndex = temp % firstArray.SizeOfDimension(j);
label.Append(currentIndex.ToString());
label.Append(j < firstArray.Rank - 1 ? "," : "]");
indices[j] = currentIndex + firstArray.GetLowerBound(j);
secondIndices[j] = currentIndex + secondArray.GetLowerBound(j);
temp /= firstArray.SizeOfDimension(j);
}
var firstEntry = firstArray.GetValue(indices);
var secondEntry = secondArray.GetValue(secondIndices);
valueDifferences.Merge(ValueDifference(firstEntry, firstName + label, secondEntry, i, firstSeen));
}
return(valueDifferences);
}
/// <summary>
/// Check Equality between actual and expected and provides details regarding differences, if any.
/// </summary>
/// <remarks>
/// Is recursive.
/// Algorithm focuses on value comparison, to better match expectations. Here is a summary of the logic:
/// 1. deals with expected = null case
/// 2. tries Equals, if success, values are considered equals
/// 3. if there is recursion (self referencing object), values are assumed as different
/// 4. if both values are numerical, compare them after conversion if needed.
/// 5. if expected is an anonymous type, use a property based comparison
/// 6. if both are enumerations, perform enumeration comparison
/// 7. report values as different.
/// </remarks>
/// <typeparam name="TA">type of the actual value</typeparam>
/// <typeparam name="TE">type of the expected value</typeparam>
/// <param name="actual">actual value</param>
/// <param name="firstName">name/label to use for messages</param>
/// <param name="expected">expected value</param>
/// <param name="refIndex">reference index (for collections)</param>
/// <param name="firstSeen">track recursion</param>
/// <returns></returns>
private static AggregatedDifference ValueDifference <TA, TE>(TA actual, string firstName, TE expected,
int refIndex, ICollection <object> firstSeen)
{
var result = new AggregatedDifference();
// handle null case first
if (expected == null)
{
if (actual != null)
{
result.Add(DifferenceDetails.DoesNotHaveExpectedValue(firstName, actual, null, refIndex));
}
return(result);
}
// if both equals from a BCL perspective, we are done.
if (EqualityHelper.CustomEquals(expected, actual))
{
return(result);
}
// handle actual is null
if (actual == null)
{
result.Add(DifferenceDetails.DoesNotHaveExpectedValue(firstName, null, expected, refIndex));
return(result);
}
// do not recurse
if (firstSeen.Contains(actual))
{
result.Add(DifferenceDetails.DoesNotHaveExpectedValue(firstName, actual, expected, 0));
return(result);
}
firstSeen = new List <object>(firstSeen)
{
actual
};
// deals with numerical
var type = expected.GetType();
var commonType = actual.GetType().FindCommonNumericalType(type);
// we silently convert numerical values
if (commonType != null)
{
return(NumericalValueDifference(actual, firstName, expected, refIndex, commonType, result));
}
if (type.TypeIsAnonymous())
{
return(AnonymousTypeDifference(actual, expected, type, result));
}
// handle enumeration
if (actual.IsAnEnumeration(false) && expected.IsAnEnumeration(false))
{
return(ValueDifferenceEnumerable(actual as IEnumerable, firstName, expected as IEnumerable, firstSeen));
}
result.Add(DifferenceDetails.DoesNotHaveExpectedValue(firstName, actual, expected, refIndex));
return(result);
}