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ThenByTests.cs
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78 lines (69 loc) · 2.76 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.LegacyTests
{
public class ThenByTests
{
[Fact]
public void SecondaryKeysAreUnique()
{
var source = new[]
{
new { Name = "Jim", City = "Minneapolis", Country = "USA" },
new { Name = "Tim", City = "Seattle", Country = "USA" },
new { Name = "Philip", City = "Orlando", Country = "USA" },
new { Name = "Chris", City = "London", Country = "UK" },
new { Name = "Rob", City = "Kent", Country = "UK" }
};
var expected = new[]
{
new { Name = "Rob", City = "Kent", Country = "UK" },
new { Name = "Chris", City = "London", Country = "UK" },
new { Name = "Jim", City = "Minneapolis", Country = "USA" },
new { Name = "Philip", City = "Orlando", Country = "USA" },
new { Name = "Tim", City = "Seattle", Country = "USA" }
};
Assert.Equal(expected, source.AsQueryable().OrderBy(e => e.Country).ThenBy(e => e.City));
}
[Fact]
public void NullSource()
{
IOrderedQueryable<int> source = null;
Assert.Throws<ArgumentNullException>("source", () => source.ThenBy(i => i));
}
[Fact]
public void NullKeySelector()
{
Expression<Func<DateTime, int>> keySelector = null;
Assert.Throws<ArgumentNullException>("keySelector", () => Enumerable.Empty<DateTime>().AsQueryable().OrderBy(e => e).ThenBy(keySelector));
}
[Fact]
public void NullSourceComparer()
{
IOrderedQueryable<int> source = null;
Assert.Throws<ArgumentNullException>("source", () => source.ThenBy(i => i, null));
}
[Fact]
public void NullKeySelectorComparer()
{
Expression<Func<DateTime, int>> keySelector = null;
Assert.Throws<ArgumentNullException>("keySelector", () => Enumerable.Empty<DateTime>().AsQueryable().OrderBy(e => e).ThenBy(keySelector, null));
}
[Fact]
public void ThenBy1()
{
var count = (new int[] { 0, 1, 2 }).AsQueryable().OrderBy(n => n).ThenBy(n => n).Count();
Assert.Equal(3, count);
}
[Fact]
public void ThenBy2()
{
var count = (new int[] { 0, 1, 2 }).AsQueryable().OrderBy(n => n).ThenBy(n => n, Comparer<int>.Default).Count();
Assert.Equal(3, count);
}
}
}