add tests

tests/test.py

@@ -0,0 +1,39 @@
+#!/usr/bin/env python2
+
+from tempfile import TemporaryDirectory
+import os
+import subprocess
+from pathlib import Path
+import shutil
+import unittest
+
+
+TEST_ROOT = Path(__file__).resolve().parent
+
+
+class IntegrationTest(unittest.TestCase):
+    def setUp(self) -> None:
+        self.env = os.environ.copy()
+        self.dir = TemporaryDirectory()
+        self.env["HOME"] = str(self.dir.name)
+        self.testenv = Path(self.dir.name).joinpath("testenv")
+        shutil.copytree(TEST_ROOT.joinpath("testenv"), self.testenv)
+        direnvrc = str(TEST_ROOT.parent.joinpath("direnvrc"))
+        with open(self.testenv.joinpath(".envrc"), "w") as f:
+            f.write(f"source {direnvrc}\n")
+            f.write(f"use nix")
+
+    def test_direnv(self) -> None:
+        subprocess.run(
+            ["direnv", "allow"], cwd=str(self.testenv), env=self.env, check=True
+        )
+        subprocess.run(
+            ["direnv", "exec", str(self.testenv), "hello"], env=self.env, check=True
+        )
+
+    def tearDown(self) -> None:
+        self.dir.cleanup()
+
+
+if __name__ == "__main__":
+    unittest.main()