refactor(debye-cam): add preview signal to camera integrations

tests/tests_devices/test_cameras.py

@@ -39,7 +39,8 @@ def test_basler_init(mock_basler):
     assert mock_basler._live_mode is False
     assert mock_basler._live_mode_event is None
     assert mock_basler._task_status is None
-    assert mock_basler._n_rot90 == -1
+    assert mock_basler.preview.ndim == 2
+    assert mock_basler.preview.num_rotation_90 == -1
 
 
 @pytest.fixture(scope="function")
@@ -65,4 +66,5 @@ def test_prosilica_init(mock_prosilica):
     assert mock_prosilica._live_mode is False
     assert mock_prosilica._live_mode_event is None
     assert mock_prosilica._task_status is None
-    assert mock_prosilica._n_rot90 == -1
+    assert mock_prosilica.preview.ndim == 2
+    assert mock_prosilica.preview.num_rotation_90 == -1

tests/tests_devices/test_debye_base_cam.py

@@ -34,7 +34,8 @@ def test_init(mock_cam):
     assert mock_cam._live_mode is False
     assert mock_cam._live_mode_event is None
     assert mock_cam._task_status is None
-    assert mock_cam._n_rot90 == -1
+    assert mock_cam.preview.ndim == 2
+    assert mock_cam.preview.num_rotation_90 == -1
 
 
 def test_start_live_mode(mock_cam):