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ToArrayTests.cs
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ToArrayTests.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;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xunit;
namespace System.Linq.Tests
{
public class ToArrayTests : EnumerableTests
{
[Fact]
public void ToArray_CreateACopyWhenNotEmpty()
{
int[] sourceArray = new int[] { 1, 2, 3, 4, 5 };
int[] resultArray = sourceArray.ToArray();
Assert.NotSame(sourceArray, resultArray);
Assert.Equal(sourceArray, resultArray);
}
[Fact]
public void ToArray_UseArrayEmptyWhenEmpty()
{
int[] emptySourceArray = Array.Empty<int>();
Assert.Same(emptySourceArray.ToArray(), emptySourceArray.ToArray());
Assert.Same(emptySourceArray.Select(i => i).ToArray(), emptySourceArray.Select(i => i).ToArray());
Assert.Same(emptySourceArray.ToList().Select(i => i).ToArray(), emptySourceArray.ToList().Select(i => i).ToArray());
Assert.Same(new Collection<int>(emptySourceArray).Select(i => i).ToArray(), new Collection<int>(emptySourceArray).Select(i => i).ToArray());
Assert.Same(emptySourceArray.OrderBy(i => i).ToArray(), emptySourceArray.OrderBy(i => i).ToArray());
Assert.Same(Enumerable.Range(5, 0).ToArray(), Enumerable.Range(3, 0).ToArray());
Assert.Same(Enumerable.Range(5, 3).Take(0).ToArray(), Enumerable.Range(3, 0).ToArray());
Assert.Same(Enumerable.Range(5, 3).Skip(3).ToArray(), Enumerable.Range(3, 0).ToArray());
Assert.Same(Enumerable.Repeat(42, 0).ToArray(), Enumerable.Range(84, 0).ToArray());
Assert.Same(Enumerable.Repeat(42, 3).Take(0).ToArray(), Enumerable.Range(84, 3).Take(0).ToArray());
Assert.Same(Enumerable.Repeat(42, 3).Skip(3).ToArray(), Enumerable.Range(84, 3).Skip(3).ToArray());
}
private void RunToArrayOnAllCollectionTypes<T>(T[] items, Action<T[]> validation)
{
validation(Enumerable.ToArray(items));
validation(Enumerable.ToArray(new List<T>(items)));
validation(new TestEnumerable<T>(items).ToArray());
validation(new TestReadOnlyCollection<T>(items).ToArray());
validation(new TestCollection<T>(items).ToArray());
}
[Fact]
public void ToArray_WorkWithEmptyCollection()
{
RunToArrayOnAllCollectionTypes(new int[0],
resultArray =>
{
Assert.NotNull(resultArray);
Assert.Equal(0, resultArray.Length);
});
}
[Fact]
public void ToArray_ProduceCorrectArray()
{
int[] sourceArray = new int[] { 1, 2, 3, 4, 5, 6, 7 };
RunToArrayOnAllCollectionTypes(sourceArray,
resultArray =>
{
Assert.Equal(sourceArray.Length, resultArray.Length);
Assert.Equal(sourceArray, resultArray);
});
string[] sourceStringArray = new string[] { "1", "2", "3", "4", "5", "6", "7", "8" };
RunToArrayOnAllCollectionTypes(sourceStringArray,
resultStringArray =>
{
Assert.Equal(sourceStringArray.Length, resultStringArray.Length);
for (int i = 0; i < sourceStringArray.Length; i++)
Assert.Same(sourceStringArray[i], resultStringArray[i]);
});
}
[Fact]
public void RunOnce()
{
Assert.Equal(new int[] {1, 2, 3, 4, 5, 6, 7}, Enumerable.Range(1, 7).RunOnce().ToArray());
Assert.Equal(
new string[] {"1", "2", "3", "4", "5", "6", "7", "8"},
Enumerable.Range(1, 8).Select(i => i.ToString()).RunOnce().ToArray());
}
[Fact]
public void ToArray_TouchCountWithICollection()
{
TestCollection<int> source = new TestCollection<int>(new int[] { 1, 2, 3, 4 });
var resultArray = source.ToArray();
Assert.Equal(source, resultArray);
Assert.Equal(1, source.CountTouched);
}
[Fact]
public void ToArray_ThrowArgumentNullExceptionWhenSourceIsNull()
{
int[] source = null;
AssertExtensions.Throws<ArgumentNullException>("source", () => source.ToArray());
}
// Generally the optimal approach. Anything that breaks this should be confirmed as not harming performance.
[Fact]
public void ToArray_UseCopyToWithICollection()
{
TestCollection<int> source = new TestCollection<int>(new int[] { 1, 2, 3, 4 });
var resultArray = source.ToArray();
Assert.Equal(source, resultArray);
Assert.Equal(1, source.CopyToTouched);
}
[ConditionalFact(typeof(TestEnvironment), nameof(TestEnvironment.IsStressModeEnabled))]
public void ToArray_FailOnExtremelyLargeCollection()
{
var largeSeq = new FastInfiniteEnumerator<byte>();
var thrownException = Assert.ThrowsAny<Exception>(() => { largeSeq.ToArray(); });
Assert.True(thrownException.GetType() == typeof(OverflowException) || thrownException.GetType() == typeof(OutOfMemoryException));
}
[Theory]
[InlineData(new int[] { }, new string[] { })]
[InlineData(new int[] { 1 }, new string[] { "1" })]
[InlineData(new int[] { 1, 2, 3 }, new string[] { "1", "2", "3" })]
public void ToArray_ArrayWhereSelect(int[] sourceIntegers, string[] convertedStrings)
{
Assert.Equal(convertedStrings, sourceIntegers.Select(i => i.ToString()).ToArray());
Assert.Equal(sourceIntegers, sourceIntegers.Where(i => true).ToArray());
Assert.Equal(Array.Empty<int>(), sourceIntegers.Where(i => false).ToArray());
Assert.Equal(convertedStrings, sourceIntegers.Where(i => true).Select(i => i.ToString()).ToArray());
Assert.Equal(Array.Empty<string>(), sourceIntegers.Where(i => false).Select(i => i.ToString()).ToArray());
Assert.Equal(convertedStrings, sourceIntegers.Select(i => i.ToString()).Where(s => s != null).ToArray());
Assert.Equal(Array.Empty<string>(), sourceIntegers.Select(i => i.ToString()).Where(s => s == null).ToArray());
}
[Theory]
[InlineData(new int[] { }, new string[] { })]
[InlineData(new int[] { 1 }, new string[] { "1" })]
[InlineData(new int[] { 1, 2, 3 }, new string[] { "1", "2", "3" })]
public void ToArray_ListWhereSelect(int[] sourceIntegers, string[] convertedStrings)
{
var sourceList = new List<int>(sourceIntegers);
Assert.Equal(convertedStrings, sourceList.Select(i => i.ToString()).ToArray());
Assert.Equal(sourceList, sourceList.Where(i => true).ToArray());
Assert.Equal(Array.Empty<int>(), sourceList.Where(i => false).ToArray());
Assert.Equal(convertedStrings, sourceList.Where(i => true).Select(i => i.ToString()).ToArray());
Assert.Equal(Array.Empty<string>(), sourceList.Where(i => false).Select(i => i.ToString()).ToArray());
Assert.Equal(convertedStrings, sourceList.Select(i => i.ToString()).Where(s => s != null).ToArray());
Assert.Equal(Array.Empty<string>(), sourceList.Select(i => i.ToString()).Where(s => s == null).ToArray());
}
[Fact]
public void SameResultsRepeatCallsFromWhereOnIntQuery()
{
var q = from x in new[] { 9999, 0, 888, -1, 66, -777, 1, 2, -12345 }
where x > int.MinValue
select x;
Assert.Equal(q.ToArray(), q.ToArray());
}
[Fact]
public void SameResultsRepeatCallsFromWhereOnStringQuery()
{
var q = from x in new[] { "!@#$%^", "C", "AAA", "", "Calling Twice", "SoS", string.Empty }
where !string.IsNullOrEmpty(x)
select x;
Assert.Equal(q.ToArray(), q.ToArray());
}
[Fact]
public void SameResultsButNotSameObject()
{
var qInt = from x in new[] { 9999, 0, 888, -1, 66, -777, 1, 2, -12345 }
where x > int.MinValue
select x;
var qString = from x in new[] { "!@#$%^", "C", "AAA", "", "Calling Twice", "SoS", string.Empty }
where !string.IsNullOrEmpty(x)
select x;
Assert.NotSame(qInt.ToArray(), qInt.ToArray());
Assert.NotSame(qString.ToArray(), qString.ToArray());
}
[Fact]
public void EmptyArraysSameObject()
{
// .NET Core returns the instance as an optimization.
// see https://github.com/dotnet/corefx/pull/2401.
Assert.True(ReferenceEquals(Enumerable.Empty<int>().ToArray(), Enumerable.Empty<int>().ToArray()));
var array = new int[0];
Assert.NotSame(array, array.ToArray());
}
[Fact]
public void SourceIsEmptyICollectionT()
{
int[] source = { };
ICollection<int> collection = source as ICollection<int>;
Assert.Empty(source.ToArray());
Assert.Empty(collection.ToArray());
}
[Fact]
public void SourceIsICollectionTWithFewElements()
{
int?[] source = { -5, null, 0, 10, 3, -1, null, 4, 9 };
int?[] expected = { -5, null, 0, 10, 3, -1, null, 4, 9 };
ICollection<int?> collection = source as ICollection<int?>;
Assert.Equal(expected, source.ToArray());
Assert.Equal(expected, collection.ToArray());
}
[Fact]
public void SourceNotICollectionAndIsEmpty()
{
IEnumerable<int> source = NumberRangeGuaranteedNotCollectionType(-4, 0);
Assert.Null(source as ICollection<int>);
Assert.Empty(source.ToArray());
}
[Fact]
public void SourceNotICollectionAndHasElements()
{
IEnumerable<int> source = NumberRangeGuaranteedNotCollectionType(-4, 10);
int[] expected = { -4, -3, -2, -1, 0, 1, 2, 3, 4, 5 };
Assert.Null(source as ICollection<int>);
Assert.Equal(expected, source.ToArray());
}
[Fact]
public void SourceNotICollectionAndAllNull()
{
IEnumerable<int?> source = RepeatedNullableNumberGuaranteedNotCollectionType(null, 5);
int?[] expected = { null, null, null, null, null };
Assert.Null(source as ICollection<int>);
Assert.Equal(expected, source.ToArray());
}
[Fact]
public void ConstantTimeCountPartitionSelectSameTypeToArray()
{
var source = Enumerable.Range(0, 100).Select(i => i * 2).Skip(1).Take(5);
Assert.Equal(new[] { 2, 4, 6, 8, 10 }, source.ToArray());
}
[Fact]
public void ConstantTimeCountPartitionSelectDiffTypeToArray()
{
var source = Enumerable.Range(0, 100).Select(i => i.ToString()).Skip(1).Take(5);
Assert.Equal(new[] { "1", "2", "3", "4", "5" }, source.ToArray());
}
[Fact]
public void ConstantTimeCountEmptyPartitionSelectSameTypeToArray()
{
var source = Enumerable.Range(0, 100).Select(i => i * 2).Skip(1000);
Assert.Empty(source.ToArray());
}
[Fact]
public void ConstantTimeCountEmptyPartitionSelectDiffTypeToArray()
{
var source = Enumerable.Range(0, 100).Select(i => i.ToString()).Skip(1000);
Assert.Empty(source.ToArray());
}
[Fact]
public void NonConstantTimeCountPartitionSelectSameTypeToArray()
{
var source = NumberRangeGuaranteedNotCollectionType(0, 100).OrderBy(i => i).Select(i => i * 2).Skip(1).Take(5);
Assert.Equal(new[] { 2, 4, 6, 8, 10 }, source.ToArray());
}
[Fact]
public void NonConstantTimeCountPartitionSelectDiffTypeToArray()
{
var source = NumberRangeGuaranteedNotCollectionType(0, 100).OrderBy(i => i).Select(i => i.ToString()).Skip(1).Take(5);
Assert.Equal(new[] { "1", "2", "3", "4", "5" }, source.ToArray());
}
[Fact]
public void NonConstantTimeCountEmptyPartitionSelectSameTypeToArray()
{
var source = NumberRangeGuaranteedNotCollectionType(0, 100).OrderBy(i => i).Select(i => i * 2).Skip(1000);
Assert.Empty(source.ToArray());
}
[Fact]
public void NonConstantTimeCountEmptyPartitionSelectDiffTypeToArray()
{
var source = NumberRangeGuaranteedNotCollectionType(0, 100).OrderBy(i => i).Select(i => i.ToString()).Skip(1000);
Assert.Empty(source.ToArray());
}
[Theory]
[MemberData(nameof(ToArrayShouldWorkWithSpecialLengthLazyEnumerables_MemberData))]
public void ToArrayShouldWorkWithSpecialLengthLazyEnumerables(int length)
{
Debug.Assert(length >= 0);
var range = Enumerable.Range(0, length);
var lazyEnumerable = ForceNotCollection(range); // We won't go down the IIListProvider path
Assert.Equal(range, lazyEnumerable.ToArray());
}
// Consider that two very similar enums is not unheard of, if e.g. two assemblies map the
// same external source of numbers (codes, response codes, colour codes, etc.) to values.
private enum Enum0
{
First,
Second,
Third
}
private enum Enum1
{
First,
Second,
Third
}
[Fact]
[ActiveIssue("https://github.com/dotnet/runtime/issues/85146", typeof(PlatformDetection), nameof(PlatformDetection.IsNativeAot))]
public void ToArray_Cast()
{
Enum0[] source = { Enum0.First, Enum0.Second, Enum0.Third };
var cast = source.Cast<Enum1>();
Assert.IsType<Enum0[]>(cast);
var castArray = cast.ToArray();
Assert.IsType<Enum1[]>(castArray);
Assert.Equal(new[] { Enum1.First, Enum1.Second, Enum1.Third }, castArray);
}
public static IEnumerable<object[]> ToArrayShouldWorkWithSpecialLengthLazyEnumerables_MemberData()
{
// Return array sizes that should be small enough not to OOM
int MaxPower = PlatformDetection.IsBrowser ? 15 : 18;
yield return new object[] { 1 };
yield return new object[] { 2 };
for (int i = 2; i <= MaxPower; i++)
{
yield return new object[] { (i << i) - 1 };
yield return new object[] { (i << i) };
yield return new object[] { (i << i) + 1 };
}
}
}
}