public void ByElement_CreatesComparerBasedOnAllElementsEquality()
{
var comparer = EqualityComparer.ByElements <IEnumerable <string> >();
comparer.Should()
.HandleBasicEqualitiesAndInequalites()
.And.ValidateEqualityOf(
new[] { "a", "b", "c" },
new[] { "a", "b", "c" },
"sequences with equals elements should equals")
.And.ValidateEqualityOf(
new[] { "a", "b", null },
new[] { "a", "b", null },
"sequences with equals elements should equals even if some elements are nulls")
.And.ValidateEqualityOf(
new List <string> {
"a", "b", "c"
},
new HashSet <string> {
"a", "b", "c"
},
"sequences with equals elements should equals even if their types are different")
.And.InvalidateEqualityOf(
new[] { "a", "b", "c" },
new[] { "d", "e", "f" },
"sequences with different elements shouldn't equals");
}