public void ExportToFile_ReturnsCorrectOutputinStream()
{
var grader = new Grader();
grader.ScoreList.Add(new PersonAndScore("BUNDY", "TERESA", 89));
grader.ScoreList.Add(new PersonAndScore("BUNDY", "LUCY", 88));
int expectedNumOfLines = grader.ScoreList.Count;
using (var stream = new MemoryStream())
{
using (var streamWriter = new StreamWriter(stream))
{
grader.ExportToFile(streamWriter);
//let's read what has been written
streamWriter.Flush();
stream.Position = 0;
using (var sr = new StreamReader(stream))
{
string output = sr.ReadToEnd();
//let's check output is as expected
string[] lines = output.Split(new string[] { Environment.NewLine }, StringSplitOptions.None);
Assert.IsTrue(lines.Length == expectedNumOfLines + 1); //one more because of end of line at the end of the file
Assert.AreEqual("BUNDY" + SEPARATOR + "TERESA" + SEPARATOR + 89, lines[0]);
Assert.AreEqual("BUNDY" + SEPARATOR + "LUCY" + SEPARATOR + 88, lines[1]);
}
}
}
}