public void EditText()
{
string str = "test";
editableText.SetTextContents (str);
Assert.AreEqual (str, text.GetText (), "GetText");
editableText.InsertText (2, "abcd", 4);
Assert.AreEqual ("teabcdst", text.GetText (), "GetText");
editableText.DeleteText (2, 6);
Assert.AreEqual (str, text.GetText (), "GetText");
}