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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 Xunit;
using System.Buffers;
using System.Collections.Generic;
using System.Runtime.InteropServices;
namespace System.MemoryTests
{
public static partial class ReadOnlyMemoryTests
{
public static IEnumerable<object[]> StringInputs()
{
yield return new object[] { "" };
yield return new object[] { "a" };
yield return new object[] { "a\0bcdefghijklmnopqrstuvwxyz" };
}
[Theory]
[MemberData(nameof(StringInputs))]
public static void AsReadOnlyMemory_ToArray_Roundtrips(string input)
{
ReadOnlyMemory<char> m = input.AsMemory();
Assert.Equal(input, new string(m.ToArray()));
}
[Theory]
[MemberData(nameof(StringInputs))]
public static void AsReadOnlyMemory_Span_Roundtrips(string input)
{
ReadOnlyMemory<char> m = input.AsMemory();
ReadOnlySpan<char> s = m.Span;
Assert.Equal(input, new string(s.ToArray()));
}
[Theory]
[InlineData("", 0, 0)]
[InlineData("0123456789", 0, 0)]
[InlineData("0123456789", 10, 0)]
[InlineData("0123456789", 0, 10)]
[InlineData("0123456789", 1, 9)]
[InlineData("0123456789", 2, 8)]
[InlineData("0123456789", 9, 1)]
[InlineData("0123456789", 1, 8)]
[InlineData("0123456789", 5, 3)]
public static void AsReadOnlyMemory_Slice_MatchesSubstring(string input, int offset, int count)
{
ReadOnlyMemory<char> m = input.AsMemory();
Assert.Equal(input.Substring(offset, count), new string(m.Slice(offset, count).ToArray()));
Assert.Equal(input.Substring(offset, count), new string(m.Slice(offset, count).Span.ToArray()));
Assert.Equal(input.Substring(offset), new string(m.Slice(offset).ToArray()));
}
[Fact]
public static void AsReadOnlyMemory_NullString_Default()
{
ReadOnlyMemory<char> m = ((string)null).AsMemory();
m.Validate();
Assert.Equal(default, m);
m = ((string)null).AsMemory(0);
m.Validate();
Assert.Equal(default, m);
m = ((string)null).AsMemory(0, 0);
m.Validate();
Assert.Equal(default, m);
}
[Fact]
public static void NullAsReadOnlyMemoryNonZeroStartAndLength()
{
string str = null;
Assert.Throws<ArgumentOutOfRangeException>(() => str.AsMemory(1));
Assert.Throws<ArgumentOutOfRangeException>(() => str.AsMemory(-1));
Assert.Throws<ArgumentOutOfRangeException>(() => str.AsMemory(0, 1));
Assert.Throws<ArgumentOutOfRangeException>(() => str.AsMemory(1, 0));
Assert.Throws<ArgumentOutOfRangeException>(() => str.AsMemory(1, 1));
Assert.Throws<ArgumentOutOfRangeException>(() => str.AsMemory(-1, -1));
}
[Fact]
public static void AsReadOnlyMemory_TryGetArray_ReturnsFalse()
{
ReadOnlyMemory<char> m = "0123456789".AsMemory();
Assert.False(MemoryMarshal.TryGetArray(m, out ArraySegment<char> array));
Assert.Null(array.Array);
Assert.Equal(0, array.Offset);
Assert.Equal(0, array.Count);
}
[Fact]
public static unsafe void AsReadOnlyMemory_Pin_ExpectedPointerValue()
{
string input = "0123456789";
ReadOnlyMemory<char> m = input.AsMemory();
using (MemoryHandle h = m.Pin())
{
GC.Collect();
fixed (char* ptr = input)
{
Assert.Equal((IntPtr)ptr, (IntPtr)h.Pointer);
}
}
}
[Theory]
[MemberData(nameof(TestHelpers.StringSliceTestData), MemberType = typeof(TestHelpers))]
public static unsafe void AsReadOnlyMemory_PointerAndLength(string text, int start, int length)
{
ReadOnlyMemory<char> m;
if (start == -1)
{
start = 0;
length = text.Length;
m = text.AsMemory();
}
else if (length == -1)
{
length = text.Length - start;
m = text.AsMemory(start);
}
else
{
m = text.AsMemory(start, length);
}
Assert.Equal(length, m.Length);
using (MemoryHandle h = m.Pin())
{
fixed (char* pText = text)
{
char* expected = pText + start;
void* actual = h.Pointer;
Assert.Equal((IntPtr)expected, (IntPtr)actual);
}
}
}
[Theory]
[MemberData(nameof(TestHelpers.StringSlice2ArgTestOutOfRangeData), MemberType = typeof(TestHelpers))]
public static unsafe void AsReadOnlyMemory_2Arg_OutOfRange(string text, int start)
{
AssertExtensions.Throws<ArgumentOutOfRangeException>("start", () => text.AsMemory(start));
}
[Theory]
[MemberData(nameof(TestHelpers.StringSlice3ArgTestOutOfRangeData), MemberType = typeof(TestHelpers))]
public static unsafe void AsReadOnlyMemory_3Arg_OutOfRange(string text, int start, int length)
{
AssertExtensions.Throws<ArgumentOutOfRangeException>("start", () => text.AsMemory(start, length));
}
[Fact]
public static void AsReadOnlyMemory_EqualsAndGetHashCode_ExpectedResults()
{
ReadOnlyMemory<char> m1 = new string('a', 4).AsMemory();
ReadOnlyMemory<char> m2 = new string('a', 4).AsMemory();
Assert.True(m1.Span.SequenceEqual(m2.Span));
Assert.True(m1.Equals(m1));
Assert.True(m1.Equals((object)m1));
Assert.False(m1.Equals(m2));
Assert.False(m1.Equals((object)m2));
Assert.Equal(m1.GetHashCode(), m1.GetHashCode());
}
}
}
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