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TESTING.md

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+# Testing
+
+Auto Clip is audio-heavy, so tests are split into:
+- **Sanity / unit tests** (fast, no audio required)
+- Optional **integration tests** (needs real audio files; not included by default)
+
+## Install dev deps
+```bash
+pip install -U pytest
+```
+
+## Run tests
+From repo root:
+```bash
+pytest -q
+```
+
+## What the sanity tests validate
+- ffmpeg is available in PATH (or the test is skipped with a clear message)
+- CLI argument parsing doesn't crash
+- selection parsing is correct (ranges, lists)
+- report JSON schema expectations (keys exist)
+- basic utilities remain importable
+
+These tests are designed to catch “oops I broke the CLI” regressions quickly.