add tests

.github/workflows/test.yml

@@ -0,0 +1,12 @@
+name: "Test"
+on:
+  pull_request:
+  push:
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: cachix/install-nix-action@v7
+    - run:
+        nix-shell -I nixpkgs=https://github.com/NixOS/nixpkgs-channels/archive/nixpkgs-unstable.tar.gz ci.nix --run 'true'

ci.nix

@@ -0,0 +1,21 @@
+with import <nixpkgs> {};
+mkShell {
+  nativeBuildInputs = [
+    shellcheck direnv mypy python3.pkgs.black python3.pkgs.flake8
+  ];
+
+  shellHook = ''
+    set -e
+    echo -e "\x1b[32m## run shellcheck\x1b[0m"
+    LC_ALL=en_US.utf-8 black --check .
+    echo -e "\x1b[32m## run black\x1b[0m"
+    LC_ALL=en_US.utf-8 black --check .
+    echo -e "\x1b[32m## run flake8\x1b[0m"
+    flake8 --ignore E501 tests
+    echo -e "\x1b[32m## run mypy\x1b[0m"
+    mypy tests
+
+    echo -e "\x1b[32m## run unittest\x1b[0m"
+    ${pkgs.python3.interpreter} -m unittest discover tests
+  '';
+}

default.nix

@@ -0,0 +1,26 @@
+{ pkgs ? import <nixpkgs> {} }:
+
+with pkgs;
+stdenv.mkDerivation {
+  name = "nix-direnv";
+
+  src = ./.;
+
+  postPatch = ''
+    substituteInPlace direnvrc \
+      --replace "grep" "${gnugrep}/bin/grep" \
+      --replace "nix-shell" "${nix}/bin/nix-shell" \
+      --replace "nix-instantiate" "${nix}/bin/nix-shell"
+  '';
+
+  installPhase = ''
+    install -m500 -D direnvrc $out/share/nix-direnv/direnvrc
+  '';
+
+  meta = with stdenv.lib; {
+    description = "A fast, persistent use_nix implementation for direnv";
+    homepage    = "https://github.com/nix-community/nix-direnv";
+    license     = licenses.mit;
+    platforms   = platforms.unix;
+  };
+}

shell.nix

@@ -0,0 +1,8 @@
+with import <nixpkgs> {};
+mkShell {
+  nativeBuildInputs = [
+    python3
+    shellcheck
+    direnv
+  ];
+}

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()

tests/testenv/.envrc

@@ -0,0 +1,2 @@
+source ../../direnvrc
+use nix

tests/testenv/shell.nix

@@ -0,0 +1,4 @@
+with import <nixpkgs> {};
+mkShell {
+  nativeBuildInputs = [ hello ];
+}