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- // 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 DistinctUntilChanged : Tests
- {
- [Fact]
- public void DistinctUntilChanged_Arguments()
- {
- AssertThrows<ArgumentNullException>(() => EnumerableEx.DistinctUntilChanged<int>(null));
- AssertThrows<ArgumentNullException>(() => EnumerableEx.DistinctUntilChanged<int>(null, EqualityComparer<int>.Default));
- AssertThrows<ArgumentNullException>(() => EnumerableEx.DistinctUntilChanged<int>([1], null));
- AssertThrows<ArgumentNullException>(() => EnumerableEx.DistinctUntilChanged<int, int>(null, _ => _));
- AssertThrows<ArgumentNullException>(() => EnumerableEx.DistinctUntilChanged<int, int>([1], null));
- AssertThrows<ArgumentNullException>(() => EnumerableEx.DistinctUntilChanged<int, int>(null, _ => _, EqualityComparer<int>.Default));
- AssertThrows<ArgumentNullException>(() => EnumerableEx.DistinctUntilChanged<int, int>([1], null, EqualityComparer<int>.Default));
- AssertThrows<ArgumentNullException>(() => EnumerableEx.DistinctUntilChanged<int, int>([1], _ => _, null));
- }
- [Fact]
- public void DistinctUntilChanged1()
- {
- var res = new[] { 1, 2, 2, 3, 3, 3, 2, 2, 1 }.DistinctUntilChanged().ToList();
- Assert.True(Enumerable.SequenceEqual(res, [1, 2, 3, 2, 1]));
- }
- [Fact]
- public void DistinctUntilChanged2()
- {
- var res = new[] { 1, 1, 2, 3, 4, 5, 5, 6, 7 }.DistinctUntilChanged(x => x / 2).ToList();
- Assert.True(Enumerable.SequenceEqual(res, [1, 2, 4, 6]));
- }
- }
- }
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