openlp/tests/openlp_core/widgets/test_widgets.py

# -*- coding: utf-8 -*-

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"""
Package to test the screens tab functionality (primarily ScreenSelectionWidget and ScreenButton classes)
within openlp/core/widgets/widgets.py
"""
import pytest

from unittest.mock import MagicMock, call, patch

from PyQt5 import QtCore, QtWidgets, QtTest

from openlp.core.common.settings import ProxyMode
from openlp.core.display.screens import Screen
from openlp.core.widgets.widgets import ProxyWidget, ProxyDialog, ScreenButton, ScreenSelectionWidget


@pytest.fixture()
def form(settings):
    test_form = ScreenSelectionWidget()
    return test_form


def mocked_screens(custom_geometry):
    screen0 = MagicMock()
    screen0.number = 0
    screen0.is_display = True
    screen0.is_primary = False
    screen0.geometry = QtCore.QRect(-271, -1080, 1920, 1080)
    screen0.custom_geometry = custom_geometry
    screen0.__str__.return_value = "Screen 1"
    screen1 = MagicMock()
    screen1.number = 1
    screen1.is_display = False
    screen1.is_primary = True
    screen1.geometry = QtCore.QRect(0, 0, 1366, 768)
    screen1.custom_geometry = custom_geometry
    screen1.__str__.return_value = "Screen 2"
    return [screen0, screen1]


@patch('openlp.core.display.screens.ScreenList')
def test_screen_buttons_show_pixels(mocked_screenList, form):
    '''
    Test that the screen buttons show the screen sizes in pixels
    '''
    # GIVEN: A mocked extended desktop configuration

    mocked_screenList.return_value = mocked_screens(None)
    form.screens = mocked_screenList()

    # WHEN: When I go into screen settings for the display screen
    ScreenSelectionWidget.load(form)

    # THEN: The screen buttons should show the correct size of that screen
    screen_0_button = form.findChild(QtWidgets.QPushButton, 'screen_0_button')
    screen_1_button = form.findChild(QtWidgets.QPushButton, 'screen_1_button')
    assert '1920' in str(screen_0_button.text())
    assert '1080' in str(screen_0_button.text())
    assert '1366' in str(screen_1_button.text())
    assert '768' in str(screen_1_button.text())


@patch('openlp.core.display.screens.ScreenList')
def test_spinboxes_no_previous_custom_geometry(mocked_screenList, form):
    """
    Test screen custom geometry can be changed from None
    """
    # GIVEN: A mocked extended desktop configuration

    mocked_screenList.return_value = mocked_screens(None)
    form.screens = mocked_screenList()

    # WHEN: When I go into screen settings for the display screen and set the custom geometry
    ScreenSelectionWidget.load(form)
    QtTest.QTest.mouseClick(form.custom_geometry_button, QtCore.Qt.LeftButton)
    QtTest.QTest.keyClick(form.left_spin_box, QtCore.Qt.Key_Up)
    QtTest.QTest.keyClick(form.top_spin_box, QtCore.Qt.Key_Up)
    QtTest.QTest.keyClick(form.width_spin_box, QtCore.Qt.Key_Down)
    QtTest.QTest.keyClick(form.height_spin_box, QtCore.Qt.Key_Down)

    # THEN: The spin boxes should show the correct values
    assert form.left_spin_box.value() == 1
    assert form.top_spin_box.value() == 1
    assert form.width_spin_box.value() == 1919
    assert form.height_spin_box.value() == 1079


@patch('openlp.core.display.screens.ScreenList')
def test_spinboxes_with_previous_custom_geometry(mocked_screenList, form):
    """
    Test screen existing custom geometry can be changed
    """
    # GIVEN: A mocked extended desktop configuration

    testGeometry = QtCore.QRect(1, 1, 1919, 1079)
    mocked_screenList.return_value = mocked_screens(testGeometry)
    form.screens = mocked_screenList()

    # WHEN: When I go into screen settings for the display screen and update the custom geometry
    ScreenSelectionWidget.load(form)
    QtTest.QTest.mouseClick(form.custom_geometry_button, QtCore.Qt.LeftButton)
    QtTest.QTest.keyClick(form.left_spin_box, QtCore.Qt.Key_Up)
    QtTest.QTest.keyClick(form.top_spin_box, QtCore.Qt.Key_Up)
    QtTest.QTest.keyClick(form.width_spin_box, QtCore.Qt.Key_Down)
    QtTest.QTest.keyClick(form.height_spin_box, QtCore.Qt.Key_Down)

    # THEN: The spin boxes should show the updated values
    assert form.left_spin_box.value() == 2
    assert form.top_spin_box.value() == 2
    assert form.width_spin_box.value() == 1918
    assert form.height_spin_box.value() == 1078


@patch('openlp.core.display.screens.ScreenList')
def test_spinboxes_going_outside_screen_geometry(mocked_screenList, form):
    """
    Test screen existing custom geometry can be increased beyond the bounds of the screen
    """
    # GIVEN: A mocked extended desktop configuration

    testGeometry = QtCore.QRect(1, 1, 1919, 1079)
    mocked_screenList.return_value = mocked_screens(testGeometry)
    form.screens = mocked_screenList()

    # WHEN: When I go into screen settings for the display screen and
    #       update the custom geometry to be outside the screen coordinates
    ScreenSelectionWidget.load(form)
    QtTest.QTest.mouseClick(form.custom_geometry_button, QtCore.Qt.LeftButton)
    for _ in range(2):
        QtTest.QTest.keyClick(form.left_spin_box, QtCore.Qt.Key_Down)
        QtTest.QTest.keyClick(form.top_spin_box, QtCore.Qt.Key_Down)
        QtTest.QTest.keyClick(form.width_spin_box, QtCore.Qt.Key_Up)
        QtTest.QTest.keyClick(form.height_spin_box, QtCore.Qt.Key_Up)

    # THEN: The spin boxes should show the updated values
    assert form.left_spin_box.value() == -1
    assert form.top_spin_box.value() == -1
    assert form.width_spin_box.value() == 1921
    assert form.height_spin_box.value() == 1081


def test_radio_button_exclusivity_no_proxy(settings):
    """
    Test that only one radio button can be checked at a time, and that the line edits are only enabled when the
    `manual_proxy_radio` is checked
    """
    # GIVEN: An instance of the `openlp.core.common.widgets.widgets.ProxyWidget` with a radio already checked
    proxy_widget = ProxyWidget()
    proxy_widget.manual_proxy_radio.setChecked(True)

    # WHEN: 'Checking' the `no_proxy_radio` button
    proxy_widget.no_proxy_radio.setChecked(True)

    # THEN: The other radio buttons should not be checked and the line edits should not be enabled
    assert proxy_widget.use_sysem_proxy_radio.isChecked() is False
    assert proxy_widget.manual_proxy_radio.isChecked() is False
    assert proxy_widget.http_edit.isEnabled() is False
    assert proxy_widget.https_edit.isEnabled() is False
    assert proxy_widget.username_edit.isEnabled() is False
    assert proxy_widget.password_edit.isEnabled() is False


def test_radio_button_exclusivity_system_proxy(settings):
    """
    Test that only one radio button can be checked at a time, and that the line edits are only enabled when the
    `manual_proxy_radio` is checked
    """
    # GIVEN: An instance of the `openlp.core.common.widgets.widgets.ProxyWidget` with a radio already checked
    proxy_widget = ProxyWidget()
    proxy_widget.manual_proxy_radio.setChecked(True)

    # WHEN: 'Checking' the `use_sysem_proxy_radio` button
    proxy_widget.use_sysem_proxy_radio.setChecked(True)

    # THEN: The other radio buttons should not be checked and the line edits should not be enabled
    assert proxy_widget.no_proxy_radio.isChecked() is False
    assert proxy_widget.manual_proxy_radio.isChecked() is False
    assert proxy_widget.http_edit.isEnabled() is False
    assert proxy_widget.https_edit.isEnabled() is False
    assert proxy_widget.username_edit.isEnabled() is False
    assert proxy_widget.password_edit.isEnabled() is False


def test_radio_button_exclusivity_manual_proxy(settings):
    """
    Test that only one radio button can be checked at a time, and that the line edits are only enabled when the
    `manual_proxy_radio` is checked
    """
    # GIVEN: An instance of the `openlp.core.common.widgets.widgets.ProxyWidget` with a radio already checked
    proxy_widget = ProxyWidget()
    proxy_widget.no_proxy_radio.setChecked(True)

    # WHEN: 'Checking' the `manual_proxy_radio` button
    proxy_widget.manual_proxy_radio.setChecked(True)

    # THEN: The other radio buttons should not be checked and the line edits should be enabled
    assert proxy_widget.no_proxy_radio.isChecked() is False
    assert proxy_widget.use_sysem_proxy_radio.isChecked() is False
    assert proxy_widget.http_edit.isEnabled() is True
    assert proxy_widget.https_edit.isEnabled() is True
    assert proxy_widget.username_edit.isEnabled() is True
    assert proxy_widget.password_edit.isEnabled() is True


def test_proxy_widget_load_default_settings(settings):
    """
    Test that the default settings are loaded from the config correctly
    """
    # GIVEN: And instance of the widget with default settings
    proxy_widget = ProxyWidget()

    # WHEN: Calling the `load` method
    proxy_widget.load()

    # THEN: The widget should be in its default state
    assert proxy_widget.use_sysem_proxy_radio.isChecked() is True
    assert proxy_widget.http_edit.text() == ''
    assert proxy_widget.https_edit.text() == ''
    assert proxy_widget.username_edit.text() == ''
    assert proxy_widget.password_edit.text() == ''


@patch.object(ProxyWidget, 'load')
def test_proxy_widget_save_no_proxy_settings(proxy_widget_load_patcher, qapp, mock_settings):
    """
    Test that the settings are saved correctly
    """
    # GIVEN: A Mocked settings instance of the proxy widget with some known values set
    proxy_widget = ProxyWidget()
    proxy_widget.no_proxy_radio.setChecked(True)
    proxy_widget.http_edit.setText('')
    proxy_widget.https_edit.setText('')
    proxy_widget.username_edit.setText('')
    proxy_widget.password_edit.setText('')

    # WHEN: Calling save
    proxy_widget.save()

    # THEN: The settings should be set as expected
    mock_settings.setValue.assert_has_calls(
        [call('advanced/proxy mode', ProxyMode.NO_PROXY),
         call('advanced/proxy http', ''),
         call('advanced/proxy https', ''),
         call('advanced/proxy username', ''),
         call('advanced/proxy password', '')])


@patch.object(ProxyWidget, 'load')
def test_proxy_widget_save_manual_settings(proxy_widget_load_patcher, qapp, mock_settings):
    """
    Test that the settings are saved correctly
    """
    # GIVEN: A Mocked and instance of the proxy widget with some known values set
    proxy_widget = ProxyWidget()
    proxy_widget.manual_proxy_radio.setChecked(True)
    proxy_widget.http_edit.setText('http_proxy_server:port')
    proxy_widget.https_edit.setText('https_proxy_server:port')
    proxy_widget.username_edit.setText('username')
    proxy_widget.password_edit.setText('password')

    # WHEN: Calling save
    proxy_widget.save()

    # THEN: The settings should be set as expected
    mock_settings.setValue.assert_has_calls(
        [call('advanced/proxy mode', ProxyMode.MANUAL_PROXY),
         call('advanced/proxy http', 'http_proxy_server:port'),
         call('advanced/proxy https', 'https_proxy_server:port'),
         call('advanced/proxy username', 'username'),
         call('advanced/proxy password', 'password')])


def test_proxy_dialog_init(settings):
    """Test that the ProxyDialog is created successfully"""
    # GIVEN: ProxyDialog class
    # WHEN: It is instantiated
    # THEN: There should be no problems
    ProxyDialog()


def test_proxy_dialog_accept(settings):
    """Test that the accept() method of the ProxyDialog works correctly"""
    # GIVEN: An instance of a ProxyDialog with a mocked out widget
    dlg = ProxyDialog()
    dlg.proxy_widget = MagicMock()

    # WHEN: accept() is called
    dlg.accept()

    # THEN: The save() method on the widget should have been called
    dlg.proxy_widget.save.assert_called_once()


def test_screen_button_initialisation():
    """
    Test the initialisation of the ScreenButton object
    """
    # GIVEN: A mocked screen object
    screen_mock = MagicMock(spec=Screen)
    screen_mock.number = 0
    screen_mock.geometry = None
    screen_mock.__str__.return_value = 'Mocked Screen Object'

    # WHEN: initialising the ScreenButton object
    instance = ScreenButton(None, screen_mock)

    # THEN: The ScreenButton should have been initalised correctly with the data from the mocked screen object
    assert isinstance(instance, QtWidgets.QPushButton)
    assert instance.objectName() == 'screen_0_button'
    assert instance.isCheckable() is True
    assert instance.text() == 'Mocked Screen Object'


def test_init_default_args():
    """
    Test the initialisation of ScreenSelectionWidget, when initialised with default arguments
    """
    # GIVEN: The ScreenSelectionWidget class
    # WHEN: Initialising ScreenSelectionWidget with default arguments
    with patch('openlp.core.widgets.widgets.QtCore.QTimer') as MockTimer:
        mocked_timer = MagicMock()
        MockTimer.return_value = mocked_timer
        instance = ScreenSelectionWidget()

    # THEN: ScreenSelectionWidget should be an instance of QWidget and the screens attribute should be an empty list
    assert isinstance(instance, QtWidgets.QWidget)
    assert instance.screens == []
    mocked_timer.setSingleShot.assert_called_once_with(True)
    mocked_timer.setInterval.assert_called_once_with(3000)


def test_init_with_args():
    """
    Test the initialisation of ScreenSelectionWidget, when initialised with the screens keyword arg set
    """
    # GIVEN: The ScreenSelectionWidget class
    screens_object_mock = MagicMock()

    # WHEN: Initialising ScreenSelectionWidget with the screens keyword arg set
    with patch('openlp.core.widgets.widgets.QtCore.QTimer') as MockTimer:
        mocked_timer = MagicMock()
        MockTimer.return_value = mocked_timer
        instance = ScreenSelectionWidget(screens=screens_object_mock)

    # THEN: ScreenSelectionWidget should be an instance of QWidget and the screens attribute should the mock used
    assert isinstance(instance, QtWidgets.QWidget)
    assert instance.screens is screens_object_mock
    mocked_timer.setSingleShot.assert_called_once_with(True)
    mocked_timer.setInterval.assert_called_once_with(3000)


def test_save_screen_none():
    """
    Test ScreenSelectionWidget._save_screen when called with the screen arg set as None
    """
    # GIVEN: An instance of the ScreenSelectionWidget
    instance = ScreenSelectionWidget()
    instance.display_group_box = MagicMock(spec=QtWidgets.QGroupBox)

    # WHEN: Calling _save_screen and no screen is selected
    instance._save_screen(None)

    # THEN: _save_screen should return without attempting to write to the screen object
    instance.display_group_box.isChecked.assert_not_called()


def test_save_screen_not_display():
    """
    Test ScreenSelectionWidget._save_screen when the display_group_box is not checked.
    """
    # GIVEN: An instance of the ScreenSelectionWidget, and a mocked group_box
    instance = ScreenSelectionWidget()
    instance.display_group_box = MagicMock(spec=QtWidgets.QGroupBox)
    instance.custom_geometry_button = MagicMock(spec=QtWidgets.QRadioButton, **{'isChecked.return_value': False})
    mocked_screen_object = MagicMock(spec=Screen)
    mocked_screen_object.is_dislpay = True

    # WHEN: display_group_box isn't checked and _save_screen is called with a mocked Screen object.
    instance.display_group_box.isChecked.return_value = False
    instance._save_screen(mocked_screen_object)

    # THEN: _save_screen should should be set to False
    assert mocked_screen_object.is_display is False


def test_save_screen_display():
    """
    Test ScreenSelectionWidget._save_screen when the display_group_box is checked.
    """
    # GIVEN: An instance of the ScreenSelectionWidget, and a mocked group_box
    instance = ScreenSelectionWidget()
    instance.display_group_box = MagicMock(spec=QtWidgets.QGroupBox)
    instance.custom_geometry_button = MagicMock(spec=QtWidgets.QRadioButton, **{'isChecked.return_value': False})
    mocked_screen_object = MagicMock(spec=Screen)

    # WHEN: display_group_box is checked and _save_screen is called with a mocked Screen object.
    instance.display_group_box.isChecked.return_value = True
    instance._save_screen(mocked_screen_object)

    # THEN: _save_screen should should be set to True
    assert mocked_screen_object.is_display is True


@patch('openlp.core.widgets.widgets.QtCore.QRect')
def test_save_screen_full_screen(mocked_q_rect):
    """
    Test ScreenSelectionWidget._save_screen when the display is set to full screen
    """
    # GIVEN: An instance of the ScreenSelectionWidget, and a mocked custom_geometry_button
    instance = ScreenSelectionWidget()
    instance.display_group_box = MagicMock(spec=QtWidgets.QGroupBox)
    instance.custom_geometry_button = MagicMock(spec=QtWidgets.QRadioButton)
    mocked_screen_object = MagicMock(spec=Screen)

    # WHEN: custom_geometry_button isn't checked and _save_screen is called with a mocked Screen object.
    instance.custom_geometry_button.isChecked.return_value = False
    instance._save_screen(mocked_screen_object)

    # THEN: _save_screen should not attempt to save a custom geometry
    mocked_q_rect.assert_not_called()


@patch('openlp.core.widgets.widgets.QtCore.QRect')
def test_save_screen_custom_geometry(mocked_q_rect):
    """
    Test ScreenSelectionWidget._save_screen when a custom geometry is set
    """
    # GIVEN: An instance of the ScreenSelectionWidget, and a mocked custom_geometry_button
    instance = ScreenSelectionWidget()
    instance.display_group_box = MagicMock(spec=QtWidgets.QGroupBox)
    instance.custom_geometry_button = MagicMock(spec=QtWidgets.QRadioButton)
    instance.left_spin_box = MagicMock(spec=QtWidgets.QSpinBox, **{'value.return_value': 100})
    instance.top_spin_box = MagicMock(spec=QtWidgets.QSpinBox, **{'value.return_value': 200})
    instance.width_spin_box = MagicMock(spec=QtWidgets.QSpinBox, **{'value.return_value': 300})
    instance.height_spin_box = MagicMock(spec=QtWidgets.QSpinBox, **{'value.return_value': 400})
    mocked_screen_object = MagicMock(spec=Screen)

    # WHEN: custom_geometry_button is checked and _save_screen is called with a mocked Screen object.
    instance.custom_geometry_button.isChecked.return_value = True
    instance._save_screen(mocked_screen_object)

    # THEN: _save_screen should save the custom geometry
    mocked_q_rect.assert_called_once_with(100, 200, 300, 400)


def test_setup_spin_box():
    """
    Test that ScreenSelectionWidget._setup_spin_box sets up the given spinbox correctly
    """
    # GIVEN: An instance of the ScreenSelectionWidget class and a mocked spin box object
    instance = ScreenSelectionWidget()
    spin_box_mock = MagicMock(spec=QtWidgets.QSpinBox)

    # WHEN: Calling _setup_spin_box with the mocked spin box object and some sample values
    instance._setup_spin_box(spin_box_mock, 0, 100, 50)

    # THEN: The mocked spin box object should have been set up with the specified values
    spin_box_mock.setMinimum.assert_called_once_with(0)
    spin_box_mock.setMaximum.assert_called_once_with(100)
    spin_box_mock.setValue.assert_called_once_with(50)


def test_load():
    """
    Test that ScreenSelectionWidget.load() loads the screens correctly
    """
    # GIVEN: An instance of the ScreenSelectionWidget and a whole bunch o' mocks
    instance = ScreenSelectionWidget()
    mocked_widget = MagicMock()
    mocked_item = MagicMock()
    mocked_item.widget.return_value = mocked_widget
    mocked_screen_frame_layout = MagicMock()
    mocked_screen_frame_layout.count.side_effect = [1, 0]
    mocked_screen_frame_layout.takeAt.return_value = mocked_item
    mocked_screen_button_group = MagicMock()
    mocked_screen_button_group.buttons.return_value = [mocked_widget]
    instance.screen_frame_layout = mocked_screen_frame_layout
    instance.screen_button_group = mocked_screen_button_group
    instance.screens = [Screen(number=0)]

    # WHEN: load() is called
    with patch('openlp.core.widgets.widgets.ScreenButton'):
        instance.load()

    # THEN: The mocks should have been called
    mocked_widget.setParent.assert_called_once_with(None)
    mocked_widget.deleteLater.assert_called_once()
    mocked_screen_button_group.removeButton.assert_called_once_with(mocked_widget)


def test_on_identify_timer_shot():
    """
    Test that the _on_identify_timer_shot() method removes the labels from the screens
    """
    # GIVEN: A ScreenSelectionWidget and a bunch o' mocks
    instance = ScreenSelectionWidget()
    mocked_label = MagicMock()
    instance.identify_labels = [mocked_label]

    # WHEN: _on_identify_timer_shot() is called
    instance._on_identify_timer_shot()

    # THEN: The labels should be cleared
    mocked_label.hide.assert_called_once()
    mocked_label.setParent.assert_called_once_with(None)
    mocked_label.deleteLater.assert_called_once()
    assert instance.identify_labels == []


def test_on_identify_button_clicked():
    """
    Test that the on_identify_button_clicked() method shows a label on each screen
    """
    # GIVEN: A ScreenSelectionWidget and a bunch o' mocks
    instance = ScreenSelectionWidget()
    mocked_screen = MagicMock()
    mocked_screen.geometry.x.return_value = 0
    mocked_screen.geometry.y.return_value = 0
    mocked_screen.geometry.width.return_value = 1920
    mocked_screen.__str__.return_value = 'Screen 1'
    instance.screens = [mocked_screen]
    instance.timer = MagicMock()

    # WHEN: on_identify_button_clicked() is called
    with patch('openlp.core.widgets.widgets.QtWidgets.QLabel') as MockLabel:
        mocked_label = MagicMock()
        MockLabel.return_value = mocked_label
        instance.on_identify_button_clicked()

    # THEN: The labels should be cleared
    MockLabel.assert_called_once_with(None)
    mocked_label.setAlignment.assert_called_once_with(QtCore.Qt.AlignCenter)
    mocked_label.setText.assert_called_once_with('Screen 1')
    mocked_label.setStyleSheet.assert_called_once_with('font-size: 24pt; font-weight: bold; '
                                                       'background-color: #0C0; color: #000; '
                                                       'border: 5px solid #000;')
    mocked_label.setGeometry.assert_called_once_with(QtCore.QRect(0, 0, 1920, 100))
    mocked_label.setWindowFlags.assert_called_once_with(QtCore.Qt.FramelessWindowHint | QtCore.Qt.Tool |
                                                        QtCore.Qt.WindowStaysOnTopHint |
                                                        QtCore.Qt.WindowDoesNotAcceptFocus)
    mocked_label.show.assert_called_once()
    assert instance.identify_labels == [mocked_label]
    instance.timer.start.assert_called_once()


def test_on_display_clicked_with_checked():
    """
    Test that the on_display_clicked() sets the first screen as display when the checkbx is checked
    """
    # GIVEN: A ScreenSelectionWidget and a bunch o' mocks
    instance = ScreenSelectionWidget()
    mocked_screen_1 = MagicMock()
    mocked_screen_2 = MagicMock()
    mocked_screen_2.is_display = True
    instance.screens = [mocked_screen_1, mocked_screen_2]
    instance.current_screen = mocked_screen_1

    # WHEN: on_display_clicked() is called when the checkbox is checked
    instance.on_display_clicked(True)

    # THEN: The first screen should be marked as a display
    assert mocked_screen_1.is_display is True
    assert mocked_screen_2.is_display is False


def test_on_display_clicked_with_unchecked():
    """
    Test that the on_display_clicked() disallows the checkbox to be unchecked
    """
    # GIVEN: A ScreenSelectionWidget and a bunch o' mocks
    instance = ScreenSelectionWidget()
    mocked_screen_1 = MagicMock()
    mocked_screen_2 = MagicMock()
    mocked_screen_2.is_display = True
    instance.screens = [mocked_screen_1, mocked_screen_2]
    instance.current_screen = mocked_screen_2

    # WHEN: on_display_clicked() is called when the checkbox is checked
    with patch('openlp.core.widgets.widgets.translate') as mocked_translate, \
            patch('openlp.core.widgets.widgets.critical_error_message_box') as mocked_error:
        mocked_translate.side_effect = lambda c, s: s
        instance.on_display_clicked(False)

    # THEN: The first screen should be marked as a display
    mocked_error.assert_called_once_with('Select a Display',
                                         'You need to select at least one screen to be used as a display. '
                                         'Select the screen you wish to use as a display, and check the '
                                         'checkbox for that screen.', parent=instance, question=False)
    assert instance.use_screen_check_box.isChecked() is True
    assert instance.display_group_box.isChecked() is True


def test_screen_selection_save(mock_settings):
    """
    Test that the save() method saves the screens
    """
    # GIVEN: A ScreenSelectionWidget and a bunch o' mocks
    mocked_screen = MagicMock(**{'number': 0, 'to_dict.return_value': {'number': 0}})
    instance = ScreenSelectionWidget()
    instance._save_screen = MagicMock()
    instance.screens = [mocked_screen]
    instance.current_screen = mocked_screen

    instance.save()

    # THEN: The right things should happen
    instance._save_screen.assert_called_once_with(mocked_screen)
    mocked_screen.to_dict.assert_called_once()
    mock_settings.setValue.assert_called_once_with('core/screens', {0: {'number': 0}})