rewrite tests using pytest

this allows us to use fixtures that are more flexible

tests/direnv_project.py

@@ -0,0 +1,47 @@
+#!/usr/bin/env python3
+
+from dataclasses import dataclass
+import shutil
+from tempfile import TemporaryDirectory
+from typing import Iterator
+from pathlib import Path
+
+import pytest
+
+from procs import run
+
+
+@dataclass
+class DirenvProject:
+    dir: Path
+    nix_direnv: Path
+
+    @property
+    def envrc(self) -> Path:
+        return self.dir / ".envrc"
+
+    def setup_envrc(self, content: str) -> None:
+        self.envrc.write_text(
+            f"""
+source {self.nix_direnv}
+{content}
+        """
+        )
+        run(["direnv", "allow"], cwd=self.dir)
+
+
+@pytest.fixture
+def direnv_project(test_root: Path, project_root: Path) -> Iterator[DirenvProject]:
+    """
+    Setups a direnv test project
+    """
+    with TemporaryDirectory() as _dir:
+        dir = Path(_dir) / "proj"
+        shutil.copytree(test_root / "testenv", dir)
+        nix_direnv = project_root / "direnvrc"
+
+        c = DirenvProject(Path(dir), nix_direnv)
+        try:
+            yield c
+        finally:
+            pass