// Licensed to the .NET Foundation under one or more agreements. // The .NET Foundation licenses this file to you under the MIT License. // See the LICENSE file in the project root for more information. using System; using System.Collections.Generic; using System.Linq; using Xunit; namespace Tests { public class MaxBy : Tests { #if !NET6_0_OR_GREATER [Fact] public void MaxBy_Arguments() { AssertThrows(() => EnumerableEx.MaxBy(null, (int x) => x)); AssertThrows(() => EnumerableEx.MaxBy(new[] { 1 }, default(Func))); AssertThrows(() => EnumerableEx.MaxBy(null, (int x) => x, Comparer.Default)); AssertThrows(() => EnumerableEx.MaxBy(new[] { 1 }, default(Func), Comparer.Default)); AssertThrows(() => EnumerableEx.MaxBy(new[] { 1 }, (int x) => x, null)); } [Fact] public void MaxBy1() { var res = new[] { 2, 5, 0, 7, 4, 3, 6, 2, 1 }.MaxBy(x => x % 3); Assert.True(res.SequenceEqual(new[] { 2, 5, 2 })); } [Fact] public void MaxBy_Empty() { AssertThrows(() => Enumerable.Empty().MaxBy(x => x)); } #endif } }