### Question:
DropDownTextField extends JTextField implements GComponent { JWindow getActiveMatchingWindow() { return matchingWindow; } DropDownTextField(DropDownTextFieldDataModel<T> dataModel);  DropDownTextField(DropDownTextFieldDataModel<T> dataModel, int updateMinDelay); @Override void setText(String text); boolean isMatchingListShowing(); void setConsumeEnterKeyPress(boolean consume); void setIgnoreEnterKeyPress(boolean ignore); void setMatchingWindowHeight(int height); void addDropDownSelectionChoiceListener(DropDownSelectionChoiceListener<T> listener); void addCellEditorListener(CellEditorListener listener); void removeCellEditorListener(CellEditorListener listener); T getSelectedValue(); void setSelectedValue(T value); void closeDropDownWindow();  }### Answer:
@Test public void testDropdownLocationOnParentMove() { typeText("d", true); JWindow matchingWindow = textField.getActiveMatchingWindow(); Point location = runSwing(() -> matchingWindow.getLocationOnScreen()); Point frameLocation = parentFrame.getLocationOnScreen(); Point p = new Point(frameLocation.x + 100, frameLocation.y + 100); runSwing(() -> parentFrame.setLocation(p)); waitForSwing(); JWindow currentMatchingWindow = textField.getActiveMatchingWindow(); Point newLocation = runSwing(() -> currentMatchingWindow.getLocationOnScreen()); assertNotEquals("The completion window's location did not update when its parent window " + "was moved.", location, newLocation); }
@Test public void testDropdownLocationOnResize() { typeText("d", true); JWindow matchingWindow = textField.getActiveMatchingWindow(); Dimension windowSize = matchingWindow.getSize(); Dimension size = parentFrame.getSize(); Dimension newSize = new Dimension(size.width - 50, size.height); runSwing(() -> parentFrame.setSize(newSize)); waitForSwing(); waitForCondition(() -> !windowSize.equals(matchingWindow.getSize()), "The completion window's size did not update when its parent window was resized."); }
@Test public void testNavigationKeysTriggerCompletionWindowToShow() { typeText("d", true); hideWindowPressKeyThenValidate(KeyEvent.VK_UP); hideWindowPressKeyThenValidate(KeyEvent.VK_DOWN); hideWindowPressKeyThenValidate(KeyEvent.VK_KP_UP); hideWindowPressKeyThenValidate(KeyEvent.VK_KP_DOWN); clearText(); JWindow matchingWindow = textField.getActiveMatchingWindow(); assertTrue("The completion window is showing after a clearing the text field", !matchingWindow.isShowing()); up(); assertTrue("The completion window is showing after pressing the up key in the text field " + "while the text field is empty", !matchingWindow.isShowing()); down(); assertTrue( "The completion window is showing after pressing the down key in the text field" + "while the text field is empty", !matchingWindow.isShowing()); }