test: add characterization tests for core modules

33 tests covering env/io helpers, config parsers, pipeline meta I/O,
worker inbox logic, and FastAPI smoke routes. No gmic/rembg subprocesses.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/test_pipeline.py

@@ -0,0 +1,80 @@
+"""Tests for pipeline pure helpers and meta I/O."""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+import pytest
+from app import pipeline
+
+
+@pytest.mark.parametrize(
+    ("raw", "expected"),
+    [
+        ("photo.jpg", "photo"),
+        ("../evil", "evil"),
+        ("", "photo"),
+        ("  spaced  ", "spaced"),
+        ("foo@bar", "foo_bar"),
+    ],
+)
+def test_sanitize_stem(raw: str, expected: str) -> None:
+    assert pipeline.sanitize_stem(raw) == expected
+
+
+def test_variant_filename() -> None:
+    assert pipeline.variant_filename("photo", "v1") == "photo_v1.png"
+
+
+@pytest.mark.parametrize(
+    ("command", "expected_tail"),
+    [
+        ("fx_blur 3", ["fx_blur", "3"]),
+        ("normalize", ["normalize"]),
+    ],
+)
+def test_gmic_filter_args(tmp_path: Path, command: str, expected_tail: list[str]) -> None:
+    image = tmp_path / "in.png"
+    image.touch()
+    args = pipeline.gmic_filter_args(image, command)
+    assert args[0] == str(image)
+    assert args[1:] == expected_tail
+
+
+def test_next_variant_id() -> None:
+    manifest = {"variants": [{"id": "v1"}, {"id": "v2"}]}
+    assert pipeline.next_variant_id(manifest) == "v3"
+
+
+def test_next_variant_id_after_gap() -> None:
+    manifest = {"variants": [{"id": "v1"}, {"id": "v3"}]}
+    assert pipeline.next_variant_id(manifest) == "v4"
+
+
+def test_strip_ansi() -> None:
+    assert pipeline.strip_ansi("\x1b[31merror\x1b[0m") == "error"
+
+
+def test_read_write_meta_roundtrip(data_dir: Path) -> None:
+    paths = pipeline.job_paths("event01")
+    pipeline.write_status(paths, "processing", source_file="event01.jpg")
+    meta = pipeline.read_meta("event01")
+    assert meta is not None
+    assert meta["status"] == "processing"
+    assert meta["source_file"] == "event01.jpg"
+
+    status = pipeline.read_status("event01")
+    assert status is not None
+    assert status["status"] == "processing"
+
+    manifest = pipeline.read_manifest("event01")
+    assert manifest is not None
+    assert manifest["variants"] == []
+
+
+def test_list_job_ids(data_dir: Path) -> None:
+    paths = pipeline.job_paths("a")
+    pipeline.write_status(paths, "done")
+    paths = pipeline.job_paths("b")
+    pipeline.write_status(paths, "processing")
+    assert sorted(pipeline.list_job_ids()) == ["a", "b"]