public void SelectMany()
{
Func <int, IEnumerable <int> > collectionSelector = i => Enumerable.Range(i, 10);
Func <int, int, int> resultSelector = (i, e) => e * 2;
foreach (var arr in new[] { empty, oneElement, manyElements })
{
Assert.Equal(
Enumerable.SelectMany(arr, collectionSelector, resultSelector),
ImmutableArrayExtensions.SelectMany(arr, collectionSelector, resultSelector));
}
Assert.Throws <NullReferenceException>(() => ImmutableArrayExtensions.SelectMany <int, int, int>(emptyDefault, null, null));
Assert.Throws <ArgumentNullException>(() =>
ImmutableArrayExtensions.SelectMany <int, int, int>(manyElements, null, (i, e) => e));
Assert.Throws <ArgumentNullException>(() =>
ImmutableArrayExtensions.SelectMany <int, int, int>(manyElements, i => new[] { i }, null));
}
public void SelectMany()
{
Func <int, IEnumerable <int> > collectionSelector = i => Enumerable.Range(i, 10);
Func <int, int, int> resultSelector = (i, e) => e * 2;
foreach (var arr in new[] { s_empty, s_oneElement, s_manyElements })
{
Assert.Equal(
Enumerable.SelectMany(arr, collectionSelector, resultSelector),
ImmutableArrayExtensions.SelectMany(arr, collectionSelector, resultSelector));
}
TestExtensionsMethods.ValidateDefaultThisBehavior(() => ImmutableArrayExtensions.SelectMany <int, int, int>(s_emptyDefault, null, null));
AssertExtensions.Throws <ArgumentNullException>("collectionSelector", () =>
ImmutableArrayExtensions.SelectMany <int, int, int>(s_manyElements, null, (i, e) => e));
AssertExtensions.Throws <ArgumentNullException>("resultSelector", () =>
ImmutableArrayExtensions.SelectMany <int, int, int>(s_manyElements, i => new[] { i }, null));
}
