/// <summary>
/// Display the failure information for two IEnumerables that did not match.
/// </summary>
/// <param name="writer">The MessageWriter on which to display</param>
/// <param name="expected">The expected enumeration.</param>
/// <param name="actual">The actual enumeration</param>
/// <param name="depth">The depth of this failure in a set of nested collections</param>
private void DisplayEnumerableDifferences(MessageWriter writer, IEnumerable expected, IEnumerable actual, int depth)
{
DisplayTypesAndSizes(writer, expected, actual, depth);
if (failurePoints.Count > depth)
{
FailurePoint failurePoint = failurePoints[depth];
DisplayFailurePoint(writer, expected, actual, failurePoint, depth);
if (failurePoint.ExpectedHasData && failurePoint.ActualHasData)
{
DisplayDifferences(
writer,
failurePoint.ExpectedValue,
failurePoint.ActualValue,
++depth);
}
else if (failurePoint.ActualHasData)
{
writer.Write($" Extra: < {MsgUtils.FormatValue(failurePoint.ActualValue)}, ... >");
}
else
{
writer.Write($" Missing: < {MsgUtils.FormatValue(failurePoint.ExpectedValue)}, ... >");
}
}
}
private bool EnumerablesEqual(IEnumerable expected, IEnumerable actual, ref Tolerance tolerance)
{
if (_recursionDetector.CheckRecursion(expected, actual))
{
return(false);
}
IEnumerator expectedEnum = expected.GetEnumerator();
IEnumerator actualEnum = actual.GetEnumerator();
int count;
for (count = 0; ; count++)
{
bool expectedHasData = expectedEnum.MoveNext();
bool actualHasData = actualEnum.MoveNext();
if (!expectedHasData && !actualHasData)
{
return(true);
}
if (expectedHasData != actualHasData ||
!ObjectsEqual(expectedEnum.Current, actualEnum.Current, ref tolerance))
{
FailurePoint fp = new FailurePoint();
fp.Position = count;
fp.ExpectedHasData = expectedHasData;
if (expectedHasData)
{
fp.ExpectedValue = expectedEnum.Current;
}
fp.ActualHasData = actualHasData;
if (actualHasData)
{
fp.ActualValue = actualEnum.Current;
}
FailurePoints.Insert(0, fp);
return(false);
}
}
}
/// <summary>
/// Displays a single line showing the point in the expected and actual
/// arrays at which the comparison failed. If the arrays have different
/// structures or dimensions, both values are shown.
/// </summary>
/// <param name="writer">The MessageWriter on which to display</param>
/// <param name="expected">The expected array</param>
/// <param name="actual">The actual array</param>
/// <param name="failurePoint">Index of the failure point in the underlying collections</param>
/// <param name="indent">The indentation level for the message line</param>
private void DisplayFailurePoint(MessageWriter writer, IEnumerable expected, IEnumerable actual, FailurePoint failurePoint, int indent)
{
Array expectedArray = expected as Array;
Array actualArray = actual as Array;
int expectedRank = expectedArray != null ? expectedArray.Rank : 1;
int actualRank = actualArray != null ? actualArray.Rank : 1;
bool useOneIndex = expectedRank == actualRank;
if (expectedArray != null && actualArray != null)
{
for (int r = 1; r < expectedRank && useOneIndex; r++)
{
if (expectedArray.GetLength(r) != actualArray.GetLength(r))
{
useOneIndex = false;
}
}
}
int[] expectedIndices = MsgUtils.GetArrayIndicesFromCollectionIndex(expected, (int)failurePoint.Position);
if (useOneIndex)
{
writer.WriteMessageLine(indent, ValuesDiffer_1, MsgUtils.GetArrayIndicesAsString(expectedIndices));
}
else
{
int[] actualIndices = MsgUtils.GetArrayIndicesFromCollectionIndex(actual, (int)failurePoint.Position);
writer.WriteMessageLine(indent, ValuesDiffer_2,
MsgUtils.GetArrayIndicesAsString(expectedIndices), MsgUtils.GetArrayIndicesAsString(actualIndices));
}
}