public void AppendStringToExistingFile_AppendTextWithoutNewLine_TextIsAppended()
{
//Arrange
var textToWriteToFile = "Text for test writing to file.";
var textToAppendToExistingFile = "Appended text.";
var fileName = Path.GetTempFileName();
File.WriteAllText(fileName, textToWriteToFile);
//Act
FileLibrary.AppendStringToExistingFile(textToAppendToExistingFile, fileName, false);
//Assert
Assert.AreEqual(
string.Format("{0}{1}", textToWriteToFile, textToAppendToExistingFile),
File.ReadAllText(fileName));
}