Add .gitignore and initial project files

tests/conftest.py

@@ -0,0 +1,35 @@
+from __future__ import annotations
+
+import uuid
+from pathlib import Path
+
+import pytest
+
+from tmux_shot import TmuxApp
+
+REPO_ROOT = Path(__file__).resolve().parent.parent
+DEMO_TUI = REPO_ROOT / "examples" / "demo_tui.py"
+
+
+@pytest.fixture
+def session_name() -> str:
+    return f"tmux_shot_test_{uuid.uuid4().hex[:8]}"
+
+
+@pytest.fixture
+def demo_app(session_name: str, tmp_path: Path):
+    app = TmuxApp(session_name, command=f"python3 {DEMO_TUI}", width=80, height=24)
+    try:
+        yield app
+    finally:
+        try:
+            app.kill()
+        except Exception:
+            pass  # already dead (e.g. the test quit it itself)
+
+
+@pytest.fixture
+def out_dir(tmp_path: Path) -> Path:
+    d = tmp_path / "out"
+    d.mkdir()
+    return d