private void TryReplace(string input, string pageId, string replacement, string expectedOutput)
{
using (var inputStream = new StreamReader(new MemoryStream(Encoding.UTF8.GetBytes(input))))
using (var output = new MemoryStream())
using (var outputStream = new StreamWriter(output))
{
BookStorage.ReplacePage(pageId, inputStream, outputStream, replacement);
outputStream.Flush();
output.Position = 0;
string result = new StreamReader(output).ReadToEnd();
Assert.That(result, Is.EqualTo(expectedOutput));
}
}