public void FileNotFound_FrequencyWordsTest()
{
//arrange
string fname = "10.2.SilkRoads1.txt";
//assert
Assert.ThrowsException <FileNotFoundException>(() => FrequencyWords.Exec(fname));
}
public void Null_FrequencyWordsTest()
{
string fname = null;
Assert.ThrowsException <FileNotFoundException>(() => FrequencyWords.Exec(fname));
}
