public void TestNotes() { var date = new DateTime(2018, 10, 12); var notepad = new Notepad(); notepad.Add(date, "text1"); notepad.Add(date, "text2"); var date1 = new DateTime(2018, 12, 25); notepad.Add(date1, "text3"); Assert.AreEqual(notepad.GetNotes(date).Count, 2); Assert.AreNotEqual(notepad.GetNotes(date1).Count, 2); Assert.AreEqual(notepad.GetNotes(date)[0].Text, "text1"); Assert.AreEqual(notepad.GetNotes(date)[1].Text, "text2"); }