/// <summary>
/// Tests whether two collections contain the same elements and throws an exception if either collection contains an element not in the other collection.
/// </summary>
/// <param name="expected">
/// The first collection to compare. This contains the elements the test expects.
/// </param>
/// <param name="actual">
/// The second collection to compare. This is the collection produced by the code under test.
/// </param>
/// <exception cref="T:Microsoft.VisualStudio.TestTools.UnitTesting.AssertFailedException">
/// Thrown if an element was found in one of the collections but not the other.
/// </exception>
public static void AreEnumerablesEquivalent <TItem>(IEnumerable <TItem> expected, IEnumerable <TItem> actual)
{
if ((expected == null) != (actual == null))
{
Assert.Fail(
$"{nameof(CollectionAsserter.AreEnumerablesEquivalent)} failed. Cannot compare enumerables for equivalency as {nameof(expected)} or {nameof(actual)} provided is null.");
}
if (CollectionAsserter.Equals(expected, actual))
{
return;
}
var expectedList = expected.ToList();
var actualList = actual.ToList();
if (expectedList.Count != actualList.Count)
{
Assert.Fail(
$"{nameof(CollectionAsserter.AreEnumerablesEquivalent)} failed. The number of elements are different.");
}
if (expectedList.Count == 0 || !FindMismatchedElement(
expectedList,
actualList,
out _,
out _,
out object mismatchedElement))
{
return;
}
Assert.Fail(
$"{nameof(CollectionAsserter.AreEnumerablesEquivalent)} failed. The collections contain mismatched elements. {mismatchedElement ?? "Element was null."}");
}
private static bool CompareEnumerables <TType>(
IEnumerable <TType> expected,
IEnumerable <TType> actual,
IComparer comparer,
ref string reason)
{
if (comparer == null)
{
Assert.Fail($"Cannot compare enumerables as the {nameof(comparer)} provided is null.");
}
if (CollectionAsserter.Equals(expected, actual))
{
reason = "Both enumerables are the same reference.";
return(true);
}
if (expected == null || actual == null)
{
return(false);
}
var expectedList = expected.ToList();
var actualList = actual.ToList();
if (expectedList.Count != actualList.Count)
{
reason = "The number of elements are different.";
return(false);
}
IEnumerator enumerator1 = expectedList.GetEnumerator();
IEnumerator enumerator2 = actualList.GetEnumerator();
int num = 0;
while (enumerator1.MoveNext() && enumerator2.MoveNext())
{
if (comparer.Compare(enumerator1.Current, enumerator2.Current) != 0)
{
return(false);
}
++num;
}
reason = "Both enumerables contain the same elements.";
return(true);
}
