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DistinctTests.cs
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82 lines (68 loc) · 2.28 KB
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// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
using System;
using System.Collections.Generic;
using Xunit;
namespace System.Linq.Tests
{
public class DistinctTests : EnumerableBasedTests
{
[Fact]
public void EmptySource()
{
int[] source = { };
Assert.Empty(source.AsQueryable().Distinct());
}
[Fact]
public void SingleNullElementExplicitlyUseDefaultComparer()
{
string[] source = { null };
string[] expected = { null };
Assert.Equal(expected, source.AsQueryable().Distinct(EqualityComparer<string>.Default));
}
[Fact]
public void EmptyStringDistinctFromNull()
{
string[] source = { null, null, string.Empty };
string[] expected = { null, string.Empty };
Assert.Equal(expected, source.AsQueryable().Distinct(EqualityComparer<string>.Default));
}
[Fact]
public void SourceAllDuplicates()
{
int[] source = { 5, 5, 5, 5, 5, 5 };
int[] expected = { 5 };
Assert.Equal(expected, source.AsQueryable().Distinct());
}
[Fact]
public void AllUnique()
{
int[] source = { 2, -5, 0, 6, 10, 9 };
Assert.Equal(source, source.AsQueryable().Distinct());
}
[Fact]
public void NullSource()
{
IQueryable<string> source = null;
Assert.Throws<ArgumentNullException>("source", () => source.Distinct());
}
[Fact]
public void NullSourceCustomComparer()
{
IQueryable<string> source = null;
Assert.Throws<ArgumentNullException>("source", () => source.Distinct(StringComparer.Ordinal));
}
[Fact]
public void Distinct1()
{
var count = (new int[] { 0, 1, 2, 2, 0 }).AsQueryable().Distinct().Count();
Assert.Equal(3, count);
}
[Fact]
public void Distinct2()
{
var count = (new int[] { 0, 1, 2, 2, 0 }).AsQueryable().Distinct(EqualityComparer<int>.Default).Count();
Assert.Equal(3, count);
}
}
}