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OrderByTests.cs
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92 lines (79 loc) · 2.93 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 System.Linq.Expressions;
using Xunit;
namespace System.Linq.Tests
{
public class OrderByTests : EnumerableBasedTests
{
[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.AsQueryable().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.AsQueryable().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.AsQueryable().OrderBy(e => e, null));
}
[Fact]
public void NullSource()
{
IQueryable<int> source = null;
Assert.Throws<ArgumentNullException>("source", () => source.OrderBy(i => i));
}
[Fact]
public void NullKeySelector()
{
Expression<Func<DateTime, int>> keySelector = null;
Assert.Throws<ArgumentNullException>("keySelector", () => Enumerable.Empty<DateTime>().AsQueryable().OrderBy(keySelector));
}
[Fact]
public void NullSourceComparer()
{
IQueryable<int> source = null;
Assert.Throws<ArgumentNullException>("source", () => source.OrderBy(i => i, Comparer<int>.Default));
}
[Fact]
public void NullKeySelectorComparer()
{
Expression<Func<DateTime, int>> keySelector = null;
Assert.Throws<ArgumentNullException>("keySelector", () => Enumerable.Empty<DateTime>().AsQueryable().OrderBy(keySelector, Comparer<int>.Default));
}
[Fact]
public void OrderBy1()
{
var count = (new int[] { 0, 1, 2 }).AsQueryable().OrderBy(n => n).Count();
Assert.Equal(3, count);
}
[Fact]
public void OrderBy2()
{
var count = (new int[] { 0, 1, 2 }).AsQueryable().OrderBy(n => n, Comparer<int>.Default).Count();
Assert.Equal(3, count);
}
}
}