Tidy up logging and rework tests from scratch

pyproject.toml

@@ -27,6 +27,11 @@ Homepage = "https://gitea.maveno.de/Javanaut/ffx"
 Repository = "https://gitea.maveno.de/Javanaut/ffx.git"
 Issues = "https://gitea.maveno.de/Javanaut/ffx/issues"
 
+[project.optional-dependencies]
+test = [
+  "pytest",
+]
+
 [build-system]
 requires = [
     "setuptools",
@@ -35,4 +40,13 @@ requires = [
 build-backend = "setuptools.build_meta"
 
 [project.scripts]
-ffx = "ffx.ffx:ffx"
+ffx = "ffx.cli:ffx"
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+python_files = ["test_*.py"]
+addopts = "-ra"
+markers = [
+  "integration: exercises the FFX bundle with real ffmpeg/ffprobe processes",
+  "subtrack_mapping: covers requirements/subtrack_mapping.md",
+]