| """Camera/GUI detection: the checks must be safe on a machine with no camera or no display.""" |
|
|
| from __future__ import annotations |
|
|
| import pytest |
|
|
| import config |
| from backend.inference import camera as camera_utils |
|
|
|
|
| def test_device_nodes_returns_a_list(): |
| nodes = camera_utils.device_nodes() |
| assert isinstance(nodes, list) |
| assert all(n.startswith("/dev/video") for n in nodes) |
|
|
|
|
| def test_gui_probe_never_crashes_the_test_process(): |
| """cv2.imshow aborts the process without a display, so the probe must be isolated.""" |
| ok, note = camera_utils.gui_available() |
| assert isinstance(ok, bool) |
| assert isinstance(note, str) and note |
|
|
|
|
| def test_probe_of_a_missing_index_is_reported_not_raised(): |
| probe = camera_utils.probe_camera(index=99) |
| assert probe.index == 99 |
| assert probe.readable is False |
| if not probe.opened: |
| assert "opened" in probe.error |
|
|
|
|
| def test_report_without_probing_every_index(): |
| rep = camera_utils.report(indices=[0], check_gui=True) |
| assert rep.platform |
| assert len(rep.probes) == 1 |
| assert isinstance(rep.usable, bool) |
| assert isinstance(rep.gui_available, bool) |
|
|
|
|
| def test_diagnosis_always_explains_something(): |
| rep = camera_utils.report(indices=[0], check_gui=True) |
| hints = rep.diagnosis() |
| assert hints and all(isinstance(h, str) and h for h in hints) |
|
|
|
|
| def test_open_camera_returns_a_triple_and_never_raises(): |
| cap, index, message = camera_utils.open_camera() |
| try: |
| assert isinstance(message, str) and message |
| if cap is not None: |
| assert index is not None and index >= 0 |
| else: |
| assert index is None |
| assert "indices" in message |
| finally: |
| if cap is not None: |
| cap.release() |
|
|
|
|
| def test_no_camera_help_lists_real_fallbacks(): |
| text = camera_utils.no_camera_help() |
| for token in ("run.py camera", "batch --from-dataset", "batch --video", "browser dashboard", "realtime"): |
| assert token in text, token |
|
|
|
|
| def test_probe_max_index_is_configurable(): |
| assert config.CAMERA_PROBE_MAX_INDEX >= 0 |
|
|
|
|
| @pytest.mark.parametrize("index", [0]) |
| def test_preferred_index_is_tried_first(index, monkeypatch): |
| """open_camera must report which index produced frames.""" |
| cap, used, message = camera_utils.open_camera(preferred_index=index, fallback_indices=0) |
| try: |
| if cap is None: |
| assert f"{index}" in message |
| else: |
| assert used == index |
| finally: |
| if cap is not None: |
| cap.release() |
|
|
