testing: migrate selfref-gc.sh

Change-Id: Ibead4030448fb9251be78b3c876c7f054154c83c

tests/functional/meson.build

@@ -95,7 +95,6 @@ functional_tests_scripts = [
   'eval-store.sh',
   'derivation-json.sh',
   'import-derivation.sh',
-  'selfref-gc.sh',
   'db-migration.sh',
   'bash-profile.sh',
   'store-ping.sh',

tests/functional/selfref-gc.sh

@@ -1,28 +0,0 @@
-source common.sh
-
-clearStore
-
-nix-build --no-out-link -E '
-  with import ./config.nix;
-
-  let d1 = mkDerivation {
-    name = "selfref-gc";
-    outputs = [ "out" ];
-    buildCommand = "
-      echo SELF_REF: $out > $out
-    ";
-  }; in
-
-  # the only change from d1 is d1 as an (unused) build input
-  # to get identical store path in CA.
-  mkDerivation {
-    name = "selfref-gc";
-    outputs = [ "out" ];
-    buildCommand = "
-      echo UNUSED: ${d1}
-      echo SELF_REF: $out > $out
-    ";
-  }
-'
-
-nix-collect-garbage

tests/functional2/store/test_gc.py

@@ -0,0 +1,37 @@
+from pathlib import Path
+from testlib.fixtures.file_helper import with_files
+from testlib.fixtures.nix import Nix
+from testlib.utils import get_global_asset
+
+
+@with_files({"config.nix": get_global_asset("config.nix")})
+def test_selfref_gc(nix: Nix):
+    expr = """
+        with import ./config.nix;
+
+        let d1 = mkDerivation {
+          name = "selfref-gc";
+          outputs = [ "out" ];
+          buildCommand = "
+            echo SELF_REF: $out > $out
+          ";
+        }; in
+
+        # the only change from d1 is d1 as an (unused) build input
+        # to get identical store path in CA.
+        mkDerivation {
+          name = "selfref-gc";
+          outputs = [ "out" ];
+          buildCommand = "
+            echo UNUSED: ${d1}
+            echo SELF_REF: $out > $out
+          ";
+        }
+    """
+
+    out = Path(nix.nix_build(["--no-out-link", "-E", expr]).run().ok().stdout_plain)
+    assert out.exists()
+
+    nix.nix([], nix_exe="nix-collect-garbage").run().ok()
+
+    assert list(nix.env.dirs.real_store_dir.glob("*selfref*")) == []