def METHOD_NAME(self):
    self.lv.setModel(QStringListModel([]))
    self.assertEqual(0, self.lv.model().rowCount())
    filter_row = self.lv.findChild(QLineEdit)
    filter_row.grab()
    self.lv.grab()
    QTest.keyClick(filter_row, Qt.Key_T)
    QTest.keyClick(filter_row, Qt.Key_Backspace)