Add unit tests for the plot style sidebar

Cover the behaviour that is easy to break and hard to notice: that a
preset round-trips through the widgets unchanged, that it overrides
widths a user has already chosen, that each reset button restores the
defaults with a single re-render, that a role using the ensemble color
cycle is reported without a color, and that Everest sees only the line
style section.

Author: MagnusSletten

tests/ert/unit_tests/gui/plotting/widgets/test_style_options.py

@@ -0,0 +1,100 @@
+import math
+from unittest.mock import Mock
+
+import pytest
+from PyQt6.QtWidgets import QPushButton, QWidget
+
+from ert.gui.plotting.utils import StyleRole
+from ert.gui.plotting.utils.plot_style import (
+    DEFAULT_STYLES,
+    STATISTICS_DEFAULT,
+    STATISTICS_PRESETS,
+)
+from ert.gui.plotting.widgets.plot_controls.style_options import StylePlotOptions
+
+
+def _create_options(qtbot, connection_point=None, *, is_everest=False):
+    options = StylePlotOptions(connection_point or Mock(), is_everest=is_everest)
+    qtbot.addWidget(options.get_widget())
+    return options
+
+
+def _click_reset(options, name):
+    options.get_widget().findChild(QPushButton, f"reset_{name}_button").click()
+
+
+@pytest.mark.parametrize("preset_name", list(STATISTICS_PRESETS))
+def test_that_a_statistics_preset_round_trips_through_the_controls(qtbot, preset_name):
+    options = _create_options(qtbot)
+
+    options.apply_preset(preset_name)
+
+    preset = STATISTICS_PRESETS[preset_name]
+    assert {role: options.styles()[role] for role in preset} == dict(preset)
+
+
+def test_that_a_preset_replaces_manually_chosen_widths(qtbot):
+    options = _create_options(qtbot)
+    options.apply_preset(STATISTICS_DEFAULT)
+    options._rows[StyleRole.MEAN].thickness_spinner.setValue(4.0)
+
+    options.apply_preset("All statistics")
+
+    assert math.isclose(options.styles()[StyleRole.MEAN].linewidth, 1.0)
+
+
+def test_that_resetting_line_styles_restores_defaults_with_a_single_rerender(qtbot):
+    connection_point = Mock()
+    options = _create_options(qtbot, connection_point)
+    options._rows[StyleRole.DEFAULT].thickness_spinner.setValue(4.0)
+    calls_before_reset = connection_point.call_count
+
+    _click_reset(options, "line_styles")
+
+    assert options.styles()[StyleRole.DEFAULT] == DEFAULT_STYLES[StyleRole.DEFAULT]
+    assert connection_point.call_count == calls_before_reset + 1
+
+
+def test_that_resetting_statistics_restores_the_preset_and_multiplier(qtbot):
+    connection_point = Mock()
+    options = _create_options(qtbot, connection_point)
+    options.apply_preset("All statistics")
+    options._std_dev_factor.setValue(3)
+    calls_before_reset = connection_point.call_count
+
+    _click_reset(options, "statistics_styles")
+
+    default_preset = STATISTICS_PRESETS[STATISTICS_DEFAULT]
+    assert {role: options.styles()[role] for role in default_preset} == dict(
+        default_preset
+    )
+    assert options.std_dev_factor == 1
+    assert connection_point.call_count == calls_before_reset + 1
+
+
+def test_that_a_color_palette_role_is_reported_without_a_color(qtbot):
+    options = _create_options(qtbot)
+
+    assert options.styles()[StyleRole.DEFAULT].color is None
+    assert options.styles()[StyleRole.OBSERVATIONS].color == "#000000"
+
+
+def test_that_the_line_section_is_hidden_once_all_its_rows_are_hidden(qtbot):
+    options = _create_options(qtbot)
+    line_section = options.get_widget().findChild(QWidget, "line_style_options")
+    options.set_line_styles_visible(True, realizations=True)
+    options.set_history_style_visible(False)
+    options.set_observations_style_visible(False)
+    assert not line_section.isHidden()
+
+    options.set_line_styles_visible(True, realizations=False)
+
+    assert line_section.isHidden()
+
+
+def test_that_everest_only_shows_the_line_style_section(qtbot):
+    widget = _create_options(qtbot, is_everest=True).get_widget()
+
+    assert widget.findChild(QWidget, "line_style_options") is not None
+    assert widget.findChild(QWidget, "statistics_style_options") is None
+    assert widget.findChild(QWidget, "distribution_style_options") is None