/
ContainsTest.cs
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/
ContainsTest.cs
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#region Copyright and license information
// Copyright 2010-2011 Jon Skeet
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#endregion
using System;
using System.Collections.Generic;
using System.Linq;
using NUnit.Framework;
using Edulinq.TestSupport;
namespace Edulinq.Tests
{
[TestFixture]
public class ContainsTest
{
[Test]
public void NullSourceNoComparer()
{
string[] source = null;
Assert.Throws<ArgumentNullException>(() => source.Contains("x"));
}
[Test]
public void NullSourceWithComparer()
{
string[] source = null;
Assert.Throws<ArgumentNullException>(() => source.Contains("x", StringComparer.Ordinal));
}
[Test]
public void NoMatchNoComparer()
{
// Default equality comparer is ordinal
string[] source = { "foo", "bar", "baz" };
Assert.IsFalse(source.Contains("BAR"));
}
[Test]
public void MatchNoComparer()
{
// Default equality comparer is ordinal
string[] source = { "foo", "bar", "baz" };
// Clone the string to verify it's not just using reference identity
string barClone = new String("bar".ToCharArray());
Assert.IsTrue(source.Contains(barClone));
}
[Test]
public void NoMatchNullComparer()
{
// Default equality comparer is ordinal
string[] source = { "foo", "bar", "baz" };
Assert.IsFalse(source.Contains("BAR", null));
}
[Test]
public void MatchNullComparer()
{
// Default equality comparer is ordinal
string[] source = { "foo", "bar", "baz" };
// Clone the string to verify it's not just using reference identity
string barClone = new String("bar".ToCharArray());
Assert.IsTrue(source.Contains(barClone, null));
}
[Test]
public void NoMatchWithCustomComparer()
{
// Default equality comparer is ordinal
string[] source = { "foo", "bar", "baz" };
Assert.IsFalse(source.Contains("gronk", StringComparer.OrdinalIgnoreCase));
}
[Test]
public void MatchWithCustomComparer()
{
// Default equality comparer is ordinal
string[] source = { "foo", "bar", "baz" };
Assert.IsTrue(source.Contains("BAR", StringComparer.OrdinalIgnoreCase));
}
[Test]
public void ImmediateReturnWhenMatchIsFound()
{
int[] source = { 10, 1, 5, 0 };
var query = source.Select(x => 10 / x);
// If we continued past 2, we'd see a division by zero exception
Assert.IsTrue(query.Contains(2));
}
#if !LINQBRIDGE
/// <summary>
/// I dislike this test. It tests for what I consider to be broken behaviour :(
/// See the blog post on Contains for more information.
/// </summary>
[Test]
public void SetWithDifferentComparer()
{
ICollection<string> sourceAsCollection = HashSetProvider.NewHashSet
(StringComparer.OrdinalIgnoreCase, "foo", "bar", "baz");
IEnumerable<string> sourceAsSequence = sourceAsCollection;
Assert.IsTrue(sourceAsCollection.Contains("BAR"));
Assert.IsTrue(sourceAsSequence.Contains("BAR")); // This is the line that concerns me
Assert.IsFalse(sourceAsSequence.Contains("BAR", null));
Assert.IsFalse(sourceAsSequence.Contains("BAR", StringComparer.Ordinal));
}
#endif
}
}