public void OnlyUsesBufferUpToSize(int count)
{
string text = new string('a', count);
Byte[] textInBytes = Encoding.UTF8.GetBytes(text);
Mock<StreamWriter> mock;
Byte[] buffer = new Byte[textInBytes.Length + 100];
using (MemoryStream stream = new MemoryStream(buffer))
{
StringWriter writer = new StringWriter();
mock = new Mock<StreamWriter>(MockBehavior.Strict, stream) { CallBase = true };
mock.Setup(sw => sw.Write(It.IsAny<char[]>(),
It.IsAny<int>(),
It.Is<int>(c => c == StringWriterExtensions.BufferSize ||
c == textInBytes.Length % StringWriterExtensions.BufferSize)))
.Verifiable();
StreamWriter outputWriter = mock.Object;
writer.Write(text);
writer.CopyTo(outputWriter);
mock.Verify();
}
}
public void CopiesResult()
{
// Note that a preable is not expected on the generated stream.
string text = "Hello world";
Byte[] textInBytes = Encoding.UTF8.GetBytes(text);
string outputText;
Byte[] buffer = new Byte[1024];
using (MemoryStream stream = new MemoryStream(buffer))
using (StringWriter writer = new StringWriter())
using (StreamWriter outputWriter = new StreamWriter(stream))
{
writer.Write(text);
writer.CopyTo(outputWriter);
outputText = writer.ToString();
}
Assert.Equal(text, outputText, StringComparer.Ordinal);
for (int i = 0; i < textInBytes.Length; i++)
{
Assert.Equal(textInBytes[i], buffer[i]);
}
}
public void ProperlyCopiesLargeSetsOfText(int count)
{
// The char א turns into a two byte sequence so we end up with a
// 7 byte sequence that is not a divider or 1024.
string text = string.Join(string.Empty, Enumerable.Repeat("abcdeא", count));
Byte[] textInBytes = Encoding.UTF8.GetBytes(text);
string outputText;
Byte[] buffer = new Byte[textInBytes.Length + 100];
using (MemoryStream stream = new MemoryStream(buffer))
using (StringWriter writer = new StringWriter())
{
using (StreamWriter outputWriter = new StreamWriter(stream))
{
writer.Write(text);
writer.CopyTo(outputWriter);
outputText = writer.ToString();
}
}
Assert.Equal(text, outputText, StringComparer.Ordinal);
for (int i = 0; i < textInBytes.Length; i++)
{
Assert.Equal(textInBytes[i], buffer[i]);
}
}
