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OrderByTests.cs
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260 lines (224 loc) · 8.15 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 OrderByTests : EnumerableTests
{
private class BadComparer1 : IComparer<int>
{
public int Compare(int x, int y)
{
return 1;
}
}
private class BadComparer2 : IComparer<int>
{
public int Compare(int x, int y)
{
return -1;
}
}
[Fact]
public void SameResultsRepeatCallsIntQuery()
{
var q = from x1 in new int[] { 1, 6, 0, -1, 3 }
from x2 in new int[] { 55, 49, 9, -100, 24, 25 }
select new { a1 = x1, a2 = x2 };
Assert.Equal(q.OrderBy(e => e.a1).ThenBy(f => f.a2), q.OrderBy(e => e.a1).ThenBy(f => f.a2));
}
[Fact]
public void SameResultsRepeatCallsStringQuery()
{
var q = from x1 in new[] { 55, 49, 9, -100, 24, 25, -1, 0 }
from x2 in new[] { "!@#$%^", "C", "AAA", "", null, "Calling Twice", "SoS", String.Empty }
where !String.IsNullOrEmpty(x2)
select new { a1 = x1, a2 = x2 };
Assert.Equal(q.OrderBy(e => e.a1), q.OrderBy(e => e.a1));
}
[Fact]
public void SourceEmpty()
{
int[] source = { };
Assert.Empty(source.OrderBy(e => e));
}
//FIXME: This will hang with a larger source. Do we want to deal with that case?
[Fact]
public void SurviveBadComparerAlwaysReturnsNegative()
{
int[] source = { 1 };
int[] expected = { 1 };
Assert.Equal(expected, source.OrderBy(e => e, new BadComparer2()));
}
[Fact]
public void KeySelectorReturnsNull()
{
int?[] source = { null, null, null };
int?[] expected = { null, null, null };
Assert.Equal(expected, source.OrderBy(e => e));
}
[Fact]
public void ElementsAllSameKey()
{
int?[] source = { 9, 9, 9, 9, 9, 9 };
int?[] expected = { 9, 9, 9, 9, 9, 9 };
Assert.Equal(expected, source.OrderBy(e => e));
}
[Fact]
public void KeySelectorCalled()
{
var source = new[]
{
new { Name = "Tim", Score = 90 },
new { Name = "Robert", Score = 45 },
new { Name = "Prakash", Score = 99 }
};
var expected = new[]
{
new { Name = "Prakash", Score = 99 },
new { Name = "Robert", Score = 45 },
new { Name = "Tim", Score = 90 }
};
Assert.Equal(expected, source.OrderBy(e => e.Name, null));
}
[Fact]
public void FirstAndLastAreDuplicatesCustomComparer()
{
string[] source = { "Prakash", "Alpha", "dan", "DAN", "Prakash" };
string[] expected = { "Alpha", "dan", "DAN", "Prakash", "Prakash" };
Assert.Equal(expected, source.OrderBy(e => e, StringComparer.OrdinalIgnoreCase));
}
[Fact]
public void FirstAndLastAreDuplicatesNullPassedAsComparer()
{
int[] source = { 5, 1, 3, 2, 5 };
int[] expected = { 1, 2, 3, 5, 5 };
Assert.Equal(expected, source.OrderBy(e => e, null));
}
[Fact]
public void SourceReverseOfResultNullPassedAsComparer()
{
int?[] source = { 100, 30, 9, 5, 0, -50, -75, null };
int?[] expected = { null, -75, -50, 0, 5, 9, 30, 100 };
Assert.Equal(expected, source.OrderBy(e => e, null));
}
[Fact]
public void SameKeysVerifySortStable()
{
var source = new[]
{
new { Name = "Tim", Score = 90 },
new { Name = "Robert", Score = 90 },
new { Name = "Prakash", Score = 90 },
new { Name = "Jim", Score = 90 },
new { Name = "John", Score = 90 },
new { Name = "Albert", Score = 90 },
};
var expected = new[]
{
new { Name = "Tim", Score = 90 },
new { Name = "Robert", Score = 90 },
new { Name = "Prakash", Score = 90 },
new { Name = "Jim", Score = 90 },
new { Name = "John", Score = 90 },
new { Name = "Albert", Score = 90 },
};
Assert.Equal(expected, source.OrderBy(e => e.Score));
}
[Fact]
public void OrderedToArray()
{
var source = new []
{
new { Name = "Tim", Score = 90 },
new { Name = "Robert", Score = 90 },
new { Name = "Prakash", Score = 90 },
new { Name = "Jim", Score = 90 },
new { Name = "John", Score = 90 },
new { Name = "Albert", Score = 90 },
};
var expected = new []
{
new { Name = "Tim", Score = 90 },
new { Name = "Robert", Score = 90 },
new { Name = "Prakash", Score = 90 },
new { Name = "Jim", Score = 90 },
new { Name = "John", Score = 90 },
new { Name = "Albert", Score = 90 },
};
Assert.Equal(expected, source.OrderBy(e => e.Score).ToArray());
}
[Fact]
public void EmptyOrderedToArray()
{
Assert.Empty(Enumerable.Empty<int>().OrderBy(e => e).ToArray());
}
[Fact]
public void OrderedToList()
{
var source = new[]
{
new { Name = "Tim", Score = 90 },
new { Name = "Robert", Score = 90 },
new { Name = "Prakash", Score = 90 },
new { Name = "Jim", Score = 90 },
new { Name = "John", Score = 90 },
new { Name = "Albert", Score = 90 },
};
var expected = new[]
{
new { Name = "Tim", Score = 90 },
new { Name = "Robert", Score = 90 },
new { Name = "Prakash", Score = 90 },
new { Name = "Jim", Score = 90 },
new { Name = "John", Score = 90 },
new { Name = "Albert", Score = 90 },
};
Assert.Equal(expected, source.OrderBy(e => e.Score).ToList());
}
[Fact]
public void EmptyOrderedToList()
{
Assert.Empty(Enumerable.Empty<int>().OrderBy(e => e).ToList());
}
//FIXME: This will hang with a larger source. Do we want to deal with that case?
[Fact]
public void SurviveBadComparerAlwaysReturnsPositive()
{
int[] source = { 1 };
int[] expected = { 1 };
Assert.Equal(expected, source.OrderBy(e => e, new BadComparer1()));
}
private class ExtremeComparer : IComparer<int>
{
public int Compare(int x, int y)
{
if (x == y)
return 0;
if (x < y)
return int.MinValue;
return int.MaxValue;
}
}
[Fact]
public void OrderByExtremeComparer()
{
var outOfOrder = new[] { 7, 1, 0, 9, 3, 5, 4, 2, 8, 6 };
Assert.Equal(Enumerable.Range(0, 10), outOfOrder.OrderBy(i => i, new ExtremeComparer()));
}
[Fact]
public void NullSource()
{
IEnumerable<int> source = null;
Assert.Throws<ArgumentNullException>("source", () => source.OrderBy(i => i));
}
[Fact]
public void NullKeySelector()
{
Func<DateTime, int> keySelector = null;
Assert.Throws<ArgumentNullException>("keySelector", () => Enumerable.Empty<DateTime>().OrderBy(keySelector));
}
}
}