private static void TestLastWithPredicate()
{
var a = new int[] { 2, 4, 8, 16, 32, 64 };
Assert(8, a.Last(v => v < 10));
LinqTests.ExpectException <InvalidOperationException>(() => { a.Last(v => v > 100); }, "Sequence contains no matching element");
}
private static void TestSingleWithPredicate()
{
var a = new int[] { 2, 4, 8, 16, 32, 64 };
Assert(2, a.Single(v => v < 3));
LinqTests.ExpectException <InvalidOperationException>(() => { a.Single(v => v < 10); }, "Sequence contains more than one matching element");
LinqTests.ExpectException <InvalidOperationException>(() => { a.Single(v => v > 100); }, "Sequence contains no matching element");
}
private static void TestLast()
{
var a = new int[] { 2, 4, 8, 16, 32, 64 };
Assert(64, a.Last());
var empty = new int[] { };
LinqTests.ExpectException <InvalidOperationException>(() => { empty.Last(); }, "Sequence contains no elements");
}
private static void TestSingleOrDefaultWithPredicate()
{
var a = new int[] { 2, 4, 8, 16, 32, 64 };
Assert(2, a.SingleOrDefault(v => v < 3));
LinqTests.ExpectException <InvalidOperationException>(() => { a.SingleOrDefault(v => v < 10); }, "Sequence contains more than one matching element");
Assert(0, a.SingleOrDefault(v => v > 100));
var empty = new string[] { "abc" };
Assert(null, empty.SingleOrDefault(v => v.Length > 4));
}
private static void TestSingle()
{
var a = new int[] { 64 };
Assert(64, a.Single());
var b = new int[] { 32, 64 };
LinqTests.ExpectException <InvalidOperationException>(() => { b.Single(); }, "Sequence contains more than one element");
var empty = new int[] { };
LinqTests.ExpectException <InvalidOperationException>(() => { empty.Single(); }, "Sequence contains no elements");
}
private static void TestSingleOrDefault()
{
var a = new int[] { 64 };
Assert(64, a.SingleOrDefault());
var b = new int[] { 32, 64 };
LinqTests.ExpectException <InvalidOperationException>(() => { b.SingleOrDefault(); }, "Sequence contains more than one element");
var empty = new int[] { };
Assert(0, empty.SingleOrDefault());
var emptyStrings = new string[] { };
Assert(null, emptyStrings.SingleOrDefault());
}