public void TextBoxGetLineLengthTest() { TextBox textBox = new TextBox { Text = TestText }; Assert.AreEqual(-1, textBox.GetLineLength(-1)); Assert.AreEqual(3, textBox.GetLineLength(0)); Assert.AreEqual(4, textBox.GetLineLength(1)); Assert.AreEqual(1, textBox.GetLineLength(2)); Assert.AreEqual(0, textBox.GetLineLength(3)); Assert.AreEqual(2, textBox.GetLineLength(4)); Assert.AreEqual(-1, textBox.GetLineLength(5)); }