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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.Collections.Generic;
using System.Globalization;
using Xunit;
namespace System.Collections.Tests
{
public static class ComparerTests
{
[Theory]
[InlineData("b", "a", 1)]
[InlineData("b", "b", 0)]
[InlineData("a", "b", -1)]
[InlineData(1, 0, 1)]
[InlineData(1, 1, 0)]
[InlineData(1, 2, -1)]
[InlineData(1, null, 1)]
[InlineData(null, null, 0)]
[InlineData(null, 1, -1)]
public static void Ctor_CultureInfo(object a, object b, int expected)
{
var culture = new CultureInfo("en-US");
var comparer = new Comparer(culture);
Assert.Equal(expected, Math.Sign(comparer.Compare(a, b)));
}
[Fact]
public static void Ctor_CultureInfo_NullCulture_ThrowsArgumentNullException()
{
Assert.Throws<ArgumentNullException>("culture", () => new Comparer(null)); // Culture is null
}
[Fact]
public static void DefaultInvariant_Compare()
{
CultureInfo culture1 = CultureInfo.DefaultThreadCurrentCulture;
CultureInfo culture2 = CultureInfo.DefaultThreadCurrentUICulture;
try
{
var cultureNames = new string[]
{
"cs-CZ","da-DK","de-DE","el-GR","en-US",
"es-ES","fi-FI","fr-FR","hu-HU","it-IT",
"ja-JP","ko-KR","nb-NO","nl-NL","pl-PL",
"pt-BR","pt-PT","ru-RU","sv-SE","tr-TR",
"zh-CN","zh-HK","zh-TW"
};
var string1 = new string[] { "Apple", "abc", };
var string2 = new string[] { "Æble", "ABC" };
foreach (string cultureName in cultureNames)
{
CultureInfo culture;
try
{
culture = new CultureInfo(cultureName);
}
catch (CultureNotFoundException)
{
continue;
}
// Set current culture
CultureInfo.DefaultThreadCurrentCulture = culture;
CultureInfo.DefaultThreadCurrentUICulture = culture;
// All cultures should sort the same way, irrespective of the thread's culture
Comparer comp = Comparer.DefaultInvariant;
Assert.Equal(1, comp.Compare(string1[0], string2[0]));
Assert.Equal(-1, comp.Compare(string1[1], string2[1]));
}
}
finally
{
CultureInfo.DefaultThreadCurrentCulture = culture1;
CultureInfo.DefaultThreadCurrentUICulture = culture2;
}
}
[Fact]
public static void DefaultInvariant_Compare_Invalid()
{
Comparer comp = Comparer.Default;
Assert.Throws<ArgumentException>(null, () => comp.Compare(new object(), 1)); // One object doesn't implement IComparable
Assert.Throws<ArgumentException>(null, () => comp.Compare(1, new object())); // One object doesn't implement IComparable
Assert.Throws<ArgumentException>(null, () => comp.Compare(new object(), new object())); // Both objects don't implement IComparable
Assert.Throws<ArgumentException>(null, () => comp.Compare(1, 1L)); // Different types
}
public static IEnumerable<object[]> CompareTestData()
{
yield return new object[] { new Foo(5), new Bar(5), 0 };
yield return new object[] { new Bar(5), new Foo(5), 0 };
yield return new object[] { new Foo(1), new Bar(2), -1 };
yield return new object[] { new Bar(2), new Foo(1), 1 };
}
[Theory]
[InlineData("hello", "hello", 0)]
[InlineData("HELLO", "HELLO", 0)]
[InlineData("hello", "HELLO", -1)]
[InlineData("hello", "goodbye", 1)]
[InlineData(1, 2, -1)]
[InlineData(2, 1, 1)]
[InlineData(1, 1, 0)]
[InlineData(1, null, 1)]
[InlineData(null, 1, -1)]
[InlineData(null, null, 0)]
[MemberData(nameof(CompareTestData))]
public static void Default_Compare(object a, object b, int expected)
{
Assert.Equal(expected, Math.Sign(Comparer.Default.Compare(a, b)));
}
[Fact]
public static void Default_Compare_Invalid()
{
Comparer comp = Comparer.Default;
Assert.Throws<ArgumentException>(null, () => comp.Compare(new object(), 1)); // One object doesn't implement IComparable
Assert.Throws<ArgumentException>(null, () => comp.Compare(1, new object())); // One object doesn't implement IComparable
Assert.Throws<ArgumentException>(null, () => comp.Compare(new object(), new object())); // Both objects don't implement IComparable
Assert.Throws<ArgumentException>(null, () => comp.Compare(1, 1L)); // Different types
}
private class Foo : IComparable
{
public int IntValue;
public Foo(int intValue)
{
IntValue = intValue;
}
public int CompareTo(object o)
{
if (o is Foo)
{
return IntValue.CompareTo(((Foo)o).IntValue);
}
else if (o is Bar)
{
return IntValue.CompareTo(((Bar)o).IntValue);
}
throw new ArgumentException("Object is not a Foo or a Bar");
}
}
private class Bar
{
public int IntValue;
public Bar(int intValue)
{
IntValue = intValue;
}
}
}
}
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