public void WriteUnicodeStringAndCharsWithVaryingSegmentSizes(char singleChar, int segmentSize)
{
const string testString = "aいbろ";
const int iterations = 10;
var testBufferWriter = new TestMemoryBufferWriter(segmentSize);
var sb = new StringBuilder();
using (var textWriter = new Utf8BufferTextWriter())
{
textWriter.SetWriter(testBufferWriter);
for (int i = 0; i < iterations; i++)
{
textWriter.Write(singleChar);
textWriter.Write(testString);
textWriter.Write(singleChar);
sb.Append(singleChar);
sb.Append(testString);
sb.Append(singleChar);
}
}
var expected = sb.ToString();
var data = testBufferWriter.ToArray();
var result = Encoding.UTF8.GetString(data);
Assert.Equal(expected, result);
}
private void WriteMultiByteCharactersToSmallBuffers()
{
// Test string breakdown (char => UTF-8 hex values):
// a => 61
// い => E3-81-84
// b => 62
// ろ => E3-82-8D
// c => 63
// d => 64
// は => E3-81-AF
// に => E3-81-AB
// e => 65
// ほ => E3-81-BB
// f => 66
// へ => E3-81-B8
// ど => E3-81-A9
// g => 67
// h => 68
// i => 69
// \uD800\uDC00 => F0-90-80-80 (this is a surrogate pair that is represented as a single 4-byte UTF-8 encoding)
const string testString = "aいbろcdはにeほfへどghi\uD800\uDC00";
// By mixing single byte and multi-byte characters, we know that there will
// be spaces in the active segment that cannot fit the current character. This
// means we'll be testing the GetMemory(minimumSize) logic.
var bufferWriter = new TestMemoryBufferWriter(segmentSize: 5);
var writer = new Utf8BufferTextWriter();
writer.SetWriter(bufferWriter);
writer.Write(testString);
writer.Flush();
// Verify the output
var allSegments = bufferWriter.GetSegments().Select(s => s.ToArray()).ToArray();
Assert.Collection(allSegments,
seg => Assert.Equal(new byte[] { 0x61, 0xE3, 0x81, 0x84, 0x62 }, seg), // "aいb"
seg => Assert.Equal(new byte[] { 0xE3, 0x82, 0x8D, 0x63, 0x64 }, seg), // "ろcd"
seg => Assert.Equal(new byte[] { 0xE3, 0x81, 0xAF }, seg), // "は"
seg => Assert.Equal(new byte[] { 0xE3, 0x81, 0xAB, 0x65 }, seg), // "にe"
seg => Assert.Equal(new byte[] { 0xE3, 0x81, 0xBB, 0x66 }, seg), // "ほf"
seg => Assert.Equal(new byte[] { 0xE3, 0x81, 0xB8 }, seg), // "へ"
seg => Assert.Equal(new byte[] { 0xE3, 0x81, 0xA9, 0x67, 0x68 }, seg), // "どgh"
seg => Assert.Equal(new byte[] { 0x69, 0xF0, 0x90, 0x80, 0x80 }, seg)); // "i\uD800\uDC00"
Assert.Equal(testString, Encoding.UTF8.GetString(bufferWriter.ToArray()));
}
public void GetAndReturnCachedBufferTextWriter()
{
var bufferWriter1 = new TestMemoryBufferWriter();
var textWriter1 = Utf8BufferTextWriter.Get(bufferWriter1);
textWriter1.Write("Hello");
textWriter1.Flush();
Utf8BufferTextWriter.Return(textWriter1);
Assert.Equal("Hello", Encoding.UTF8.GetString(bufferWriter1.ToArray()));
var bufferWriter2 = new TestMemoryBufferWriter();
var textWriter2 = Utf8BufferTextWriter.Get(bufferWriter2);
textWriter2.Write("World");
textWriter2.Flush();
Utf8BufferTextWriter.Return(textWriter2);
Assert.Equal("World", Encoding.UTF8.GetString(bufferWriter2.ToArray()));
Assert.Same(textWriter1, textWriter2);
}