tests/functional2/lang: Migrate search-path test

Change-Id: If7513252cff92831822438753a78c2e9f80ac06b

tests/functional/lang.sh

@@ -78,7 +78,6 @@ for i in eval-okay-*.nix; do
     else
         if
             expect 0 env \
-                NIX_PATH=dir3:dir4 \
                 HOME=/fake-home \
                 nix-instantiate "${flags[@]}" --eval --strict "$i.nix" \
                 1> "$i.out" \

tests/functional/lang/eval-okay-search-path.flags

@@ -1 +0,0 @@
---extra-deprecated-features shadow-internal-symbols -I dir1 -I dir2 -I dir5=dir3

tests/functional2/lang/search-path/test_search_path.py

@@ -0,0 +1,37 @@
+from collections.abc import Callable
+from pathlib import Path
+
+from functional2.lang.test_lang import test_eval as nix_eval
+from functional2.testlib.fixtures.file_helper import with_files, CopyTree, CopyFile, AssetSymlink
+from functional2.testlib.fixtures.nix import Nix
+from functional2.testlib.fixtures.snapshot import Snapshot
+
+
+@with_files(
+    {
+        "dir1": CopyTree("dir1"),
+        "dir2": CopyTree("dir2"),
+        "dir3": CopyTree("dir3"),
+        "dir4": CopyTree("dir4"),
+        "lib.nix": CopyFile("../lib.nix"),
+        "in.nix": CopyFile("in.nix"),
+        "out.exp": AssetSymlink("eval-okay.out.exp"),
+    }
+)
+def test_search_path(files: Path, nix: Nix, snapshot: Callable[[str], Snapshot]):
+    nix.env.set_env("NIX_PATH", "dir3:dir4")
+    nix_eval(
+        files,
+        nix,
+        [
+            "--extra-deprecated-features",
+            "shadow-internal-symbols",
+            "-I",
+            "dir1",
+            "-I",
+            "dir2",
+            "-I",
+            "dir5=dir3",
+        ],
+        snapshot,
+    )