public void LoadFile_ValidFile_CreatesSudokuArray() { //act var path = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location); var arr = sudo.LoadFile(path + @"\input_test_files\input_sudoku.txt"); //assert Assert.That(arr, Is.All.Not.Null); Assert.That(arr, Is.All.GreaterThan(0).And.LessThan(10)); Assert.That(arr, Is.All.InstanceOf <Int32>()); Assert.That(arr.GetLongLength(0), Is.EqualTo(9)); Assert.That(arr.GetLongLength(1), Is.EqualTo(9)); }