Can we write JUnits for JavaFX? - javafx

Question

I am currently working on a javafx project. I want to write the JUnit test cases for it how can i write it?
I am really not sure about writing the junit test cases for it?
I can do functional testing but not sure about writing JUnit.
Suppose I have a below method :
#FXML
public void makeDeviceContentsEditable() {
ObservableList<TextField> list = FXCollections.observableArrayList(vehicleId, vehicleName, deviceType,
offboardBroker1, offboardBroker2, postfixQueue, pKIServer);
if (editDeviceContents.isSelected() && devicePlugged) {
isDeviceSideEnabled();
for (final TextField tf : list) {
tf.setEditable(true);
tf.setStyle(GREY_OUT_REMOVED);
final String originalval = tf.getText();
tf.textProperty().addListener(new ChangeListener<String>() {
public void changed(ObservableValue<? extends String> observable, String oldValue,
String newValue) {
//if (!originalval.isEmpty() && originalval != null & isWritten) {
if (originalval != null && !originalval.isEmpty() && isWritten) {
tf.setStyle(CHANGED_TXT_COLOR);
if (newValue.equalsIgnoreCase(originalval)) {
tf.setStyle(NORMAL_COLOR);
}
if (tf.getId().equalsIgnoreCase("vehicleId")) {
editedValuesMap.put(0, newValue);
} else if (tf.getId().equalsIgnoreCase("vehicleName")) {
editedValuesMap.put(1, newValue);
} else if (tf.getId().equalsIgnoreCase("deviceType")) {
editedValuesMap.put(2, newValue);
} else if (tf.getId().equalsIgnoreCase("offboardBroker1")) {
editedValuesMap.put(3, newValue);
} else if (tf.getId().equalsIgnoreCase("offboardBroker2")) {
editedValuesMap.put(4, newValue);
} else if (tf.getId().equalsIgnoreCase("postfixQueue")) {
editedValuesMap.put(5, newValue);
} else if (tf.getId().equalsIgnoreCase("pKIServer")) {
editedValuesMap.put(6, newValue);
}
}
maxTextFieldLengthCheck(tf, newValue);
}
});
}
} else if (!editDeviceContents.isSelected()) {
for (final TextField tf : list) {
tf.setEditable(false);
}
textfieldStyle(TEXTFIELD_GREY_OUT);
bWriteToDevice.setDisable(true);
}
//isWritten=false;
}