/// <summary>
/// Test two numeric values for equality, performing the usual numeric
/// conversions and using a provided or default tolerance. If the tolerance
/// provided is Empty, this method may set it to a default tolerance.
/// </summary>
/// <param name="expected">The expected value</param>
/// <param name="actual">The actual value</param>
/// <param name="tolerance">A reference to the tolerance in effect</param>
/// <returns>True if the values are equal</returns>
public static bool AreEqual( object expected, object actual, ref Tolerance tolerance )
{
if ( expected is double || actual is double )
return AreEqual( Convert.ToDouble(expected), Convert.ToDouble(actual), ref tolerance );
if ( expected is float || actual is float )
return AreEqual( Convert.ToSingle(expected), Convert.ToSingle(actual), ref tolerance );
if (tolerance.Mode == ToleranceMode.Ulps)
throw new InvalidOperationException("Ulps may only be specified for floating point arguments");
if ( expected is decimal || actual is decimal )
return AreEqual( Convert.ToDecimal(expected), Convert.ToDecimal(actual), tolerance );
if (expected is ulong || actual is ulong)
return AreEqual(Convert.ToUInt64(expected), Convert.ToUInt64(actual), tolerance );
if ( expected is long || actual is long )
return AreEqual( Convert.ToInt64(expected), Convert.ToInt64(actual), tolerance );
if ( expected is uint || actual is uint )
return AreEqual( Convert.ToUInt32(expected), Convert.ToUInt32(actual), tolerance );
return AreEqual( Convert.ToInt32(expected), Convert.ToInt32(actual), tolerance );
}
private static bool AreEqual( int expected, int actual, Tolerance tolerance )
{
switch (tolerance.Mode)
{
case ToleranceMode.None:
return expected.Equals(actual);
case ToleranceMode.Linear:
int intTolerance = Convert.ToInt32(tolerance.Value);
if (intTolerance > 0)
return Math.Abs(expected - actual) <= intTolerance;
return expected.Equals(actual);
case ToleranceMode.Percent:
if (expected == 0)
return expected.Equals(actual);
double relativeError = Math.Abs(
(double)(expected - actual) / (double)expected);
return (relativeError <= Convert.ToDouble(tolerance.Value) / 100.0);
default:
throw new ArgumentException("Unknown tolerance mode specified", "mode");
}
}
private static bool AreEqual( float expected, float actual, ref Tolerance tolerance )
{
if ( float.IsNaN(expected) && float.IsNaN(actual) )
return true;
// handle infinity specially since subtracting two infinite values gives
// NaN and the following test fails. mono also needs NaN to be handled
// specially although ms.net could use either method.
if (float.IsInfinity(expected) || float.IsNaN(expected) || float.IsNaN(actual))
{
return expected.Equals(actual);
}
if (tolerance.IsEmpty && GlobalSettings.DefaultFloatingPointTolerance > 0.0d)
tolerance = new Tolerance(GlobalSettings.DefaultFloatingPointTolerance);
switch (tolerance.Mode)
{
case ToleranceMode.None:
return expected.Equals(actual);
case ToleranceMode.Linear:
return Math.Abs(expected - actual) <= Convert.ToDouble(tolerance.Value);
case ToleranceMode.Percent:
if (expected == 0.0f)
return expected.Equals(actual);
float relativeError = Math.Abs((expected - actual) / expected);
return (relativeError <= Convert.ToSingle(tolerance.Value) / 100.0f);
#if !NETCF_1_0
case ToleranceMode.Ulps:
return FloatingPointNumerics.AreAlmostEqualUlps(
expected, actual, Convert.ToInt32(tolerance.Value));
#endif
default:
throw new ArgumentException("Unknown tolerance mode specified", "mode");
}
}
private static bool AreEqual( uint expected, uint actual, Tolerance tolerance )
{
switch (tolerance.Mode)
{
case ToleranceMode.None:
return expected.Equals(actual);
case ToleranceMode.Linear:
uint uintTolerance = Convert.ToUInt32(tolerance.Value);
if(uintTolerance > 0)
{
uint diff = expected >= actual ? expected - actual : actual - expected;
return diff <= uintTolerance;
}
return expected.Equals( actual );
case ToleranceMode.Percent:
if(expected == 0u)
return expected.Equals(actual);
// Can't do a simple Math.Abs() here since it's unsigned
uint difference = Math.Max(expected, actual) - Math.Min(expected, actual);
double relativeError = Math.Abs((double)difference / (double)expected );
return (relativeError <= Convert.ToDouble(tolerance.Value) / 100.0);
default:
throw new ArgumentException("Unknown tolerance mode specified", "mode");
}
}
/// <summary>
/// Display Expected and Actual lines for given values, including
/// a tolerance value on the expected line.
/// </summary>
/// <param name="expected">The expected value</param>
/// <param name="actual">The actual value causing the failure</param>
/// <param name="tolerance">The tolerance within which the test was made</param>
public override void DisplayDifferences(object expected, object actual, Tolerance tolerance)
{
WriteExpectedLine(expected, tolerance);
WriteActualLine(actual);
}
/// <summary>
/// Write the generic 'Expected' line for a given value
/// and tolerance.
/// </summary>
/// <param name="expected">The expected value</param>
/// <param name="tolerance">The tolerance within which the test was made</param>
private void WriteExpectedLine(object expected, Tolerance tolerance)
{
Write(Pfx_Expected);
WriteExpectedValue(expected);
if (tolerance != null && !tolerance.IsEmpty)
{
WriteConnector("+/-");
WriteExpectedValue(tolerance.Value);
if (tolerance.Mode != ToleranceMode.Linear)
Write(" {0}", tolerance.Mode);
}
WriteLine();
}
/// <summary> /// Display Expected and Actual lines for given values, including /// a tolerance value on the Expected line. /// </summary> /// <param name="expected">The expected value</param> /// <param name="actual">The actual value causing the failure</param> /// <param name="tolerance">The tolerance within which the test was made</param> public abstract void DisplayDifferences(object expected, object actual, Tolerance tolerance);
private bool EnumerablesEqual(IEnumerable x, IEnumerable y, ref Tolerance tolerance)
{
IEnumerator expectedEnum = x.GetEnumerator();
IEnumerator actualEnum = y.GetEnumerator();
int count;
for (count = 0; ; count++)
{
bool expectedHasData = expectedEnum.MoveNext();
bool actualHasData = actualEnum.MoveNext();
if (!expectedHasData && !actualHasData)
return true;
if (expectedHasData != actualHasData ||
!AreEqual(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;
}
}
}
private bool DictionariesEqual(IDictionary x, IDictionary y, ref Tolerance tolerance)
{
if (x.Count != y.Count)
return false;
CollectionTally tally = new CollectionTally(this, x.Keys);
if (!tally.TryRemove(y.Keys) || tally.Count > 0)
return false;
foreach (object key in x.Keys)
if (!AreEqual(x[key], y[key], ref tolerance))
return false;
return true;
}
/// <summary>
/// Helper method to compare two arrays
/// </summary>
private bool ArraysEqual(Array x, Array y, ref Tolerance tolerance)
{
int rank = x.Rank;
if (rank != y.Rank)
return false;
for (int r = 1; r < rank; r++)
if (x.GetLength(r) != y.GetLength(r))
return false;
return EnumerablesEqual((IEnumerable)x, (IEnumerable)y, ref tolerance);
}
/// <summary>
/// Compares two objects for equality within a tolerance.
/// </summary>
public bool AreEqual(object x, object y, ref Tolerance tolerance)
{
this.failurePoints = new ArrayList();
if (x == null && y == null)
return true;
if (x == null || y == null)
return false;
if (object.ReferenceEquals(x, y))
return true;
Type xType = x.GetType();
Type yType = y.GetType();
EqualityAdapter externalComparer = GetExternalComparer(x, y);
if (externalComparer != null)
return externalComparer.AreEqual(x, y);
if (xType.IsArray && yType.IsArray && !compareAsCollection)
return ArraysEqual((Array)x, (Array)y, ref tolerance);
if (x is IDictionary && y is IDictionary)
return DictionariesEqual((IDictionary)x, (IDictionary)y, ref tolerance);
//if (x is ICollection && y is ICollection)
// return CollectionsEqual((ICollection)x, (ICollection)y, ref tolerance);
if (x is IEnumerable && y is IEnumerable && !(x is string && y is string))
return EnumerablesEqual((IEnumerable)x, (IEnumerable)y, ref tolerance);
if (x is string && y is string)
return StringsEqual((string)x, (string)y);
if (x is Stream && y is Stream)
return StreamsEqual((Stream)x, (Stream)y);
if (x is DirectoryInfo && y is DirectoryInfo)
return DirectoriesEqual((DirectoryInfo)x, (DirectoryInfo)y);
if (Numerics.IsNumericType(x) && Numerics.IsNumericType(y))
return Numerics.AreEqual(x, y, ref tolerance);
if (tolerance != null && tolerance.Value is TimeSpan)
{
TimeSpan amount = (TimeSpan)tolerance.Value;
if (x is DateTime && y is DateTime)
return ((DateTime)x - (DateTime)y).Duration() <= amount;
if (x is TimeSpan && y is TimeSpan)
return ((TimeSpan)x - (TimeSpan)y).Duration() <= amount;
}
#if CLR_2_0 || CLR_4_0
if (FirstImplementsIEquatableOfSecond(xType, yType))
return InvokeFirstIEquatableEqualsSecond(x, y);
else if (FirstImplementsIEquatableOfSecond(yType, xType))
return InvokeFirstIEquatableEqualsSecond(y, x);
#endif
return x.Equals(y);
}