public void Test_Add1d() { //arrange string direction = "HORIZAONTAL"; int row = 3; int col = 2; string word = "THANK"; int expect_len = 4; //act NewFile nf = new NewFile(); int act_len = nf.add_1dword(direction, row, col, word).Count; //assert Assert.AreEqual(expect_len, act_len, "The word is wrong insert"); }