rewrite tests using pytest

this allows us to use fixtures that are more flexible

tests/test_gc.py

@@ -0,0 +1,60 @@
+#!/usr/bin/env python2
+
+import sys
+import subprocess
+import unittest
+
+from procs import run
+from direnv_project import DirenvProject
+
+
+def common_test(direnv_project: DirenvProject) -> None:
+    run(["nix-collect-garbage"])
+
+    testenv = str(direnv_project.dir)
+
+    out1 = run(
+        ["direnv", "exec", testenv, "hello"],
+        stderr=subprocess.PIPE,
+        check=False,
+        cwd=direnv_project.dir,
+    )
+    sys.stderr.write(out1.stderr)
+    assert out1.returncode == 0
+    assert "renewed cache" in out1.stderr
+    assert "Executing shellHook." in out1.stderr
+
+    run(["nix-collect-garbage"])
+
+    out2 = run(
+        ["direnv", "exec", testenv, "hello"],
+        stderr=subprocess.PIPE,
+        check=False,
+        cwd=direnv_project.dir,
+    )
+    sys.stderr.write(out2.stderr)
+    assert out1.returncode == 0
+    assert "using cached dev shell" in out2.stderr
+    assert "Executing shellHook." in out2.stderr
+
+
+def test_use_nix(direnv_project: DirenvProject) -> None:
+    direnv_project.setup_envrc("use nix")
+    common_test(direnv_project)
+
+
+def test_use_flake(direnv_project: DirenvProject) -> None:
+    direnv_project.setup_envrc("use flake")
+    common_test(direnv_project)
+    inputs = list((direnv_project.dir / ".direnv/flake-inputs").iterdir())
+    # should only contain our flake-utils flake
+    if len(inputs) != 3:
+        run(["nix", "flake", "archive", "--json"], cwd=direnv_project.dir)
+        print(inputs)
+    assert len(inputs) == 3
+    for symlink in inputs:
+        assert symlink.is_dir()
+
+
+if __name__ == "__main__":
+    unittest.main()