added ruff test

apps/studio/tests/test_scene3d_view.py

@@ -20,6 +20,7 @@ mathematics (the camera, the sampler and the composer have their own files):
 
 from __future__ import annotations
 
+import math
 import time
 from concurrent.futures import Future
 from dataclasses import replace
@@ -27,17 +28,14 @@ from pathlib import Path
 
 import numpy as np
 import pytest
-
 import ui_check
-from PySide6.QtCore import Signal
-from PySide6.QtWidgets import QWidget
 from orisys_app_shared.i18n import t
 from orisys_app_shared.scene3d import synthetic
 from orisys_app_shared.scene3d.contracts import (
+    UNAVAILABLE_DESCRIPTOR,
     ColorScale,
     DisplaySettings,
     FieldDescriptor,
-    UNAVAILABLE_DESCRIPTOR,
 )
 from orisys_app_shared.scene3d.package import write_package
 from orisys_studio.app_window import MIN_PANEL_WIDTHS
@@ -49,9 +47,15 @@ from orisys_studio.scene3d.asset_source import (
     load_package,
     no_asset_diagnostic,
 )
+from PySide6.QtCore import Signal
+from PySide6.QtWidgets import QWidget
 from tests.conftest import (
     finish_run as _finish,
+)
+from tests.conftest import (
     running_window as _running_window,
+)
+from tests.conftest import (
     show_window as _show,
 )
 
@@ -60,7 +64,7 @@ from tests.conftest import (
 def write_poc(tmp_path):
     """A real package on disk, produced by the shipping writer."""
 
-    def _write(name: str = "finger-display-1.0.0") -> "object":
+    def _write(name: str = "finger-display-1.0.0") -> object:
         path = tmp_path / f"{name}{PACKAGE_SUFFIX}"
         write_package(
             synthetic.poc_scene(),
@@ -520,7 +524,9 @@ def test_a_hand_edited_settings_block_is_repaired(block):
     assert settings.field in scene3d_prefs.FIELD_CHOICES
     if settings.color_scale is not None:
         lower, upper = settings.color_scale.lower, settings.color_scale.upper
-        assert lower == lower and upper == upper, "a NaN survived the repair"
+        # Not a tautology: ``float("nan")`` is in the parametrisation above, and this
+        # is the assertion that the repair actually replaced it.
+        assert not math.isnan(lower) and not math.isnan(upper), "a NaN survived the repair"
         assert upper > lower
         assert abs(lower) <= scene3d_prefs.MAX_SCALE_BOUND
         assert abs(upper) <= scene3d_prefs.MAX_SCALE_BOUND
@@ -1129,8 +1135,8 @@ def test_every_run_gets_a_new_generation(make_window, qt_app):
     Without this the pane accepts the first run's frames and refuses every later run's,
     so the picture stays on the first run's last frame forever.
     """
-    from orisys_app_shared.scene3d.contracts import FrameIdentity
     import ui_check
+    from orisys_app_shared.scene3d.contracts import FrameIdentity
 
     window = _show(make_window(sensor_type="finger"), (1440, 880))
     try: