public void TestReferenceEquals()
{
var comparer = new CountingEqualityComparer <string>();
var collection = new[] { "a", "b" };
collection.CollectionEquals(collection, comparer).ShouldEqual(true);
Assert.Equal(0, comparer.EqualsCount);
Assert.Equal(0, comparer.HashCount);
}
private static ProfilingResult Profile <T>(
bool expectedResult,
IEnumerable <T> a,
IEnumerable <T> b,
Func <IEnumerable <T>, IEnumerable <T>, IEqualityComparer <T>, bool> equals)
{
// capture base stats
var wrappedA = a is IReadOnlyCollection <T>?new CountingEnumerableCollection <T>((IReadOnlyCollection <T>)a) : new CountingEnumerable <T>(a);
var wrappedB = b is IReadOnlyCollection <T>?new CountingEnumerableCollection <T>((IReadOnlyCollection <T>)b) : new CountingEnumerable <T>(b);
var comparer = new CountingEqualityComparer <T>();
bool result = equals(wrappedA, wrappedB, comparer);
bool fail = false;
if (expectedResult != result)
{
fail = true;
}
// capture timing stats
const int Trials = 100;
var originalThreadPriority = Thread.CurrentThread.Priority;
try
{
Thread.CurrentThread.Priority = ThreadPriority.Highest;
var stopwatch = Stopwatch.StartNew();
for (var i = 0; i < Trials; ++i)
{
if (expectedResult != equals(a, b, EqualityComparer <T> .Default))
{
fail = true;
}
}
return(new ProfilingResult
{
Duration = stopwatch.Elapsed,
EnumerateCount = wrappedA.EnumerateCount + wrappedB.EnumerateCount,
EqualsCount = comparer.EqualsCount,
HashCount = comparer.HashCount,
Result = result,
Fail = fail
});
}
finally
{
Thread.CurrentThread.Priority = originalThreadPriority;
}
}
private static ProfilingResult Profile <T>(
IEnumerable <T> a,
IEnumerable <T> b,
Func <IEnumerable <T>, IEnumerable <T>, IEqualityComparer <T>, bool> equals)
{
// capture base stats
var wrappedA = a is IReadOnlyCollection <T>?new CountingEnumerableCollection <T>((IReadOnlyCollection <T>)a) : new CountingEnumerable <T>(a);
var wrappedB = b is IReadOnlyCollection <T>?new CountingEnumerableCollection <T>((IReadOnlyCollection <T>)b) : new CountingEnumerable <T>(b);
var comparer = new CountingEqualityComparer <T>();
equals(wrappedA, wrappedB, comparer);
// capture timing stats
const int Trials = 1000;
GC.Collect();
GC.WaitForPendingFinalizers();
var originalThreadPriority = Thread.CurrentThread.Priority;
try
{
Thread.CurrentThread.Priority = ThreadPriority.Highest;
var stopwatch = Stopwatch.StartNew();
for (var i = 0; i < Trials; ++i)
{
equals(a, b, EqualityComparer <T> .Default);
}
return(new ProfilingResult
{
Duration = stopwatch.Elapsed,
EnumerateCount = wrappedA.EnumerateCount + wrappedB.EnumerateCount,
EqualsCount = comparer.EqualsCount,
HashCount = comparer.HashCount,
});
}
finally
{
Thread.CurrentThread.Priority = originalThreadPriority;
}
}
