public static void ToStringMemoryOverFullStringReturnsOriginal()
{
string original = MemoryTestHelpers.BuildString(10, 42);
ReadOnlyMemory <char> readOnlyMemory = original.AsMemory();
Memory <char> memory = MemoryMarshal.AsMemory(readOnlyMemory);
string returnedString = memory.ToString();
string returnedStringUsingSlice = memory.Slice(0, original.Length).ToString();
string subString1 = memory.Slice(1).ToString();
string subString2 = memory.Slice(0, 2).ToString();
string subString3 = memory.Slice(1, 2).ToString();
Assert.Equal(original, returnedString);
Assert.Equal(original, returnedStringUsingSlice);
Assert.Equal(original.Substring(1), subString1);
Assert.Equal(original.Substring(0, 2), subString2);
Assert.Equal(original.Substring(1, 2), subString3);
Assert.Same(original, returnedString);
Assert.Same(original, returnedStringUsingSlice);
Assert.NotSame(original, subString1);
Assert.NotSame(original, subString2);
Assert.NotSame(original, subString3);
Assert.NotSame(subString1, subString2);
Assert.NotSame(subString1, subString3);
Assert.NotSame(subString2, subString3);
}
public static void ToStringSpanOverSubstringDoesNotReturnOriginal()
{
string original = MemoryTestHelpers.BuildString(10, 42);
ReadOnlySpan <char> span = original.AsSpan();
string returnedString = span.ToString();
string returnedStringUsingSlice = span.Slice(0, original.Length).ToString();
string subString1 = span.Slice(1).ToString();
string subString2 = span.Slice(0, 2).ToString();
string subString3 = span.Slice(1, 2).ToString();
Assert.Equal(original, returnedString);
Assert.Equal(original, returnedStringUsingSlice);
Assert.Equal(original.Substring(1), subString1);
Assert.Equal(original.Substring(0, 2), subString2);
Assert.Equal(original.Substring(1, 2), subString3);
Assert.NotSame(original, subString1);
Assert.NotSame(original, subString2);
Assert.NotSame(original, subString3);
Assert.NotSame(subString1, subString2);
Assert.NotSame(subString1, subString3);
Assert.NotSame(subString2, subString3);
}