Pin the website publication toolchain

tests/test_release_catalog_publication.py

@@ -22,13 +22,64 @@ from govoplan_release.publisher import (  # noqa: E402
     publication_mutation_trust_issues,
     publish_catalog_candidate,
     remote_publication_identity,
+    run_checked,
     verify_committed_publication,
     verify_remote_branch_head,
     verify_remote_publication,
+    _trusted_npm_command,
 )
 
 
 class ReleaseCatalogPublicationTests(unittest.TestCase):
+    def test_build_command_uses_its_pinned_node_directory(self) -> None:
+        completed = subprocess.CompletedProcess(
+            ["/trusted/node/bin/npm"],
+            0,
+            stdout=b"",
+            stderr=b"",
+        )
+        with patch(
+            "govoplan_release.publisher.subprocess.run",
+            return_value=completed,
+        ) as runner:
+            run_checked(
+                ["/trusted/node/bin/npm", "run", "build"],
+                cwd=Path("/trusted/website"),
+            )
+
+        environment = runner.call_args.kwargs["env"]
+        self.assertEqual(
+            "/trusted/node/bin:/usr/bin:/bin",
+            environment["PATH"],
+        )
+
+    def test_npm_command_requires_trusted_npm_and_sibling_node(self) -> None:
+        with (
+            patch(
+                "govoplan_release.publisher.shutil.which",
+                return_value="/trusted/node/bin/npm",
+            ),
+            patch(
+                "govoplan_release.publisher._trusted_runtime_executable_issue",
+                side_effect=(None, None),
+            ) as trust_check,
+        ):
+            self.assertEqual(
+                "/trusted/node/bin/npm",
+                _trusted_npm_command("npm"),
+            )
+
+        self.assertEqual(Path("/trusted/node/bin/npm"), trust_check.call_args_list[0].args[0])
+        self.assertEqual(Path("/trusted/node/bin/node"), trust_check.call_args_list[1].args[0])
+
+    def test_npm_command_rejects_caller_relative_path(self) -> None:
+        with (
+            patch("govoplan_release.publisher.shutil.which") as which,
+            self.assertRaisesRegex(RuntimeError, "absolute path or the bare name"),
+        ):
+            _trusted_npm_command("./npm")
+        which.assert_not_called()
+
     def test_committed_publication_must_match_validated_blobs_exactly(self) -> None:
         with tempfile.TemporaryDirectory() as tmp:
             web_root = Path(tmp) / "website"