tests/functional2: migrate nix_path.sh

Change-Id: Ibc4f848721d4da628c44aa074faf009c87af165d

tests/functional/meson.build

@@ -140,7 +140,6 @@ functional_tests_scripts = [
   'eval-store.sh',
   'derivation-json.sh',
   'import-derivation.sh',
-  'nix_path.sh',
   'case-hack.sh',
   'placeholders.sh',
   'ssh-relay.sh',

tests/functional/nix_path.sh

@@ -1,14 +0,0 @@
-# Regression for https://github.com/NixOS/nix/issues/5998 and https://github.com/NixOS/nix/issues/5980
-
-source common.sh
-
-export NIX_PATH=non-existent=/non-existent/but-unused-anyways:by-absolute-path=$PWD:by-relative-path=.
-
-nix-instantiate --eval -E '<by-absolute-path/simple.nix>' --restrict-eval
-nix-instantiate --eval -E '<by-relative-path/simple.nix>' --restrict-eval
-
-# Should ideally also test this, but there’s no pure way to do it, so just trust me that it works
-# nix-instantiate --eval -E '<nixpkgs>' -I nixpkgs=channel:nixos-unstable --restrict-eval
-
-[[ $(nix-instantiate --find-file by-absolute-path/simple.nix) = $PWD/simple.nix ]]
-[[ $(nix-instantiate --find-file by-relative-path/simple.nix) = $PWD/simple.nix ]]

tests/functional2/eval/test_nix_path.py

@@ -0,0 +1,45 @@
+import pytest
+
+from functional2.testlib.fixtures.env import ManagedEnv
+from functional2.testlib.fixtures.file_helper import with_files
+from functional2.testlib.fixtures.nix import Nix
+from functional2.testlib.utils import get_global_asset
+
+
+@with_files({"trivial.nix": get_global_asset("trivial.nix")})
+@pytest.mark.parametrize("prefix", ["by-absolute-path", "by-relative-path"])
+def test_nix_path(env: ManagedEnv, nix: Nix, prefix: str):
+    env.set_env(
+        "NIX_PATH",
+        f"non-existent=/non-existent/but-unused-anyways:by-absolute-path={env.dirs.home}:by-relative-path=.",
+    )
+
+    expected_path = str(env.dirs.home / "trivial.nix")
+
+    res = (
+        nix.nix_instantiate(["--eval", "-E", f"<{prefix}/trivial.nix>", "--restrict-eval"])
+        .run()
+        .ok()
+    )
+    assert res.stdout_plain == expected_path
+    res = nix.nix_instantiate(["--find-file", f"{prefix}/trivial.nix"]).run().ok()
+    path = res.stdout_plain
+    assert path == expected_path
+
+
+@pytest.mark.skip(
+    "FIXME(Commentator2.0): for some reason the channel cannot be resolved on the builders"
+)
+def test_nix_path_nixpkgs(env: ManagedEnv, nix: Nix):
+    env.set_env(
+        "NIX_PATH",
+        f"non-existent=/non-existent/but-unused-anyways:by-absolute-path={env.dirs.home}:by-relative-path=.",
+    )
+    res = (
+        nix.nix_instantiate(
+            ["--eval", "-E", "<nixpkgs>", "-I", "nixpkgs=channel:nixos-unstable", "--restrict-eval"]
+        )
+        .run()
+        .ok()
+    )
+    assert str(env.dirs.nix_store_dir) in res.stdout_plain