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RepeatTests.cs
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RepeatTests.cs
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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.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xunit;
namespace System.Linq.Tests
{
public class RepeatTests : EnumerableTests
{
[Fact]
public void Repeat_ProduceCorrectSequence()
{
var repeatSequence = Enumerable.Repeat(1, 100);
int count = 0;
foreach (var val in repeatSequence)
{
count++;
Assert.Equal(1, val);
}
Assert.Equal(100, count);
}
[Fact]
public void Repeat_ToArray_ProduceCorrectResult()
{
var array = Enumerable.Repeat(1, 100).ToArray();
Assert.Equal(100, array.Length);
for (var i = 0; i < array.Length; i++)
Assert.Equal(1, array[i]);
}
[Fact]
public void Repeat_ToList_ProduceCorrectResult()
{
var list = Enumerable.Repeat(1, 100).ToList();
Assert.Equal(100, list.Count);
for (var i = 0; i < list.Count; i++)
Assert.Equal(1, list[i]);
}
[Fact]
public void Repeat_ProduceSameObject()
{
object objectInstance = new object();
var array = Enumerable.Repeat(objectInstance, 100).ToArray();
Assert.Equal(100, array.Length);
for (var i = 0; i < array.Length; i++)
Assert.Same(objectInstance, array[i]);
}
[Fact]
public void Repeat_WorkWithNullElement()
{
object objectInstance = null;
var array = Enumerable.Repeat(objectInstance, 100).ToArray();
Assert.Equal(100, array.Length);
for (var i = 0; i < array.Length; i++)
Assert.Null(array[i]);
}
[Fact]
public void Repeat_ZeroCountLeadToEmptySequence()
{
var array = Enumerable.Repeat(1, 0).ToArray();
Assert.Equal(0, array.Length);
}
[Fact]
public void Repeat_ThrowExceptionOnNegativeCount()
{
AssertExtensions.Throws<ArgumentOutOfRangeException>("count", () => Enumerable.Repeat(1, -1));
}
[Fact]
public void Repeat_NotEnumerateAfterEnd()
{
using (var repeatEnum = Enumerable.Repeat(1, 1).GetEnumerator())
{
Assert.True(repeatEnum.MoveNext());
Assert.False(repeatEnum.MoveNext());
Assert.False(repeatEnum.MoveNext());
}
}
[Fact]
public void Repeat_EnumerableAndEnumeratorAreSame()
{
var repeatEnumerable = Enumerable.Repeat(1, 1);
using (var repeatEnumerator = repeatEnumerable.GetEnumerator())
{
Assert.Same(repeatEnumerable, repeatEnumerator);
}
}
[Fact]
public void Repeat_GetEnumeratorReturnUniqueInstances()
{
var repeatEnumerable = Enumerable.Repeat(1, 1);
using (var enum1 = repeatEnumerable.GetEnumerator())
using (var enum2 = repeatEnumerable.GetEnumerator())
{
Assert.NotSame(enum1, enum2);
}
}
[Fact]
public void SameResultsRepeatCallsIntQuery()
{
Assert.Equal(Enumerable.Repeat(-3, 0), Enumerable.Repeat(-3, 0));
}
[Fact]
public void SameResultsRepeatCallsStringQuery()
{
Assert.Equal(Enumerable.Repeat("SSS", 99), Enumerable.Repeat("SSS", 99));
}
[Fact]
public void CountOneSingleResult()
{
int[] expected = { -15 };
Assert.Equal(expected, Enumerable.Repeat(-15, 1));
}
[Fact]
public void RepeatArbitraryCorrectResults()
{
int[] expected = { 12, 12, 12, 12, 12, 12, 12, 12 };
Assert.Equal(expected, Enumerable.Repeat(12, 8));
}
[Fact]
public void RepeatNull()
{
int?[] expected = { null, null, null, null };
Assert.Equal(expected, Enumerable.Repeat((int?)null, 4));
}
[Fact]
public void Take()
{
Assert.Equal(Enumerable.Repeat(12, 8), Enumerable.Repeat(12, 12).Take(8));
}
[Fact]
public void TakeExcessive()
{
Assert.Equal(Enumerable.Repeat("", 4), Enumerable.Repeat("", 4).Take(22));
}
[Fact]
public void Skip()
{
Assert.Equal(Enumerable.Repeat(12, 8), Enumerable.Repeat(12, 12).Skip(4));
}
[Fact]
public void SkipExcessive()
{
Assert.Empty(Enumerable.Repeat(12, 8).Skip(22));
}
[Fact]
public void TakeCanOnlyBeOne()
{
Assert.Equal(new[] { 1 }, Enumerable.Repeat(1, 10).Take(1));
Assert.Equal(new[] { 1 }, Enumerable.Repeat(1, 10).Skip(1).Take(1));
Assert.Equal(new[] { 1 }, Enumerable.Repeat(1, 10).Take(3).Skip(2));
Assert.Equal(new[] { 1 }, Enumerable.Repeat(1, 10).Take(3).Take(1));
}
[Fact]
public void SkipNone()
{
Assert.Equal(Enumerable.Repeat(12, 8), Enumerable.Repeat(12, 8).Skip(0));
}
[Fact]
public void First()
{
Assert.Equal("Test", Enumerable.Repeat("Test", 42).First());
}
[Fact]
public void FirstOrDefault()
{
Assert.Equal("Test", Enumerable.Repeat("Test", 42).FirstOrDefault());
}
[Fact]
public void Last()
{
Assert.Equal("Test", Enumerable.Repeat("Test", 42).Last());
}
[Fact]
public void LastOrDefault()
{
Assert.Equal("Test", Enumerable.Repeat("Test", 42).LastOrDefault());
}
[Fact]
public void ElementAt()
{
Assert.Equal("Test", Enumerable.Repeat("Test", 42).ElementAt(13));
}
[Fact]
public void ElementAtOrDefault()
{
Assert.Equal("Test", Enumerable.Repeat("Test", 42).ElementAtOrDefault(13));
}
[Fact]
public void ElementAtExcessive()
{
AssertExtensions.Throws<ArgumentOutOfRangeException>("index", () => Enumerable.Repeat(3, 3).ElementAt(100));
}
[Fact]
public void ElementAtOrDefaultExcessive()
{
Assert.Equal(0, Enumerable.Repeat(3, 3).ElementAtOrDefault(100));
}
[Fact]
public void Count()
{
Assert.Equal(42, Enumerable.Repeat("Test", 42).Count());
}
}
}