static void RunTest(string testData, string expected, CultureInfo culture)
{
using BoundedUtf8Span boundedSpan = new BoundedUtf8Span(testData);
Utf8Span inputSpan = boundedSpan.Span;
// First try the allocating APIs
ustring expectedUtf8 = u8(expected) ?? ustring.Empty;
ustring actualUtf8;
if (culture is null)
{
actualUtf8 = inputSpan.ToLowerInvariant();
}
else
{
actualUtf8 = inputSpan.ToLower(culture);
}
Assert.Equal(expectedUtf8, actualUtf8);
// Next, try the non-allocating APIs with too small a buffer
if (expectedUtf8.Length > 0)
{
byte[] bufferTooSmall = new byte[expectedUtf8.Length - 1];
if (culture is null)
{
Assert.Equal(-1, inputSpan.ToLowerInvariant(bufferTooSmall));
}
else
{
Assert.Equal(-1, inputSpan.ToLower(bufferTooSmall, culture));
}
}
// Then the non-allocating APIs with a properly sized buffer
foreach (int bufferSize in new[] { expectedUtf8.Length, expectedUtf8.Length + 1 })
{
byte[] buffer = new byte[expectedUtf8.Length];
if (culture is null)
{
Assert.Equal(expectedUtf8.Length, inputSpan.ToLowerInvariant(buffer));
}
else
{
Assert.Equal(expectedUtf8.Length, inputSpan.ToLower(buffer, culture));
}
Assert.True(expectedUtf8.AsBytes().SequenceEqual(buffer));
}
}
