test: add a test for npm lock generation

tests/test_npm_lock_generate.py

@@ -0,0 +1,47 @@
+import subprocess
+
+import conftest
+
+from nix_update import main
+
+
+def test_update(helpers: conftest.Helpers) -> None:
+    with helpers.testpkgs(init_git=True) as path:
+        main(
+            [
+                "--file",
+                str(path),
+                "--commit",
+                "npm-lock-generate",
+                "--version",
+                "v2.6.0",
+                "--generate-lockfile",
+            ]
+        )
+        npm_deps_name = subprocess.run(
+            [
+                "nix",
+                "eval",
+                "--raw",
+                "--extra-experimental-features",
+                "nix-command",
+                "-f",
+                path,
+                "npm-lock-generate.npmDeps.name",
+            ],
+            check=True,
+            text=True,
+            stdout=subprocess.PIPE,
+        ).stdout.strip()
+        diff = subprocess.run(
+            ["git", "-C", path, "show"],
+            text=True,
+            stdout=subprocess.PIPE,
+            check=True,
+        ).stdout.strip()
+        print(diff)
+        assert "2.6.0" in npm_deps_name
+        assert (
+            "https://github.com/olrtg/emmet-language-server/compare/v2.5.0...v2.6.0"
+            in diff
+        )

tests/testpkgs/default.nix

@@ -27,6 +27,7 @@
   savanna = pkgs.python3.pkgs.callPackage ./savanna.nix { };
   npm = pkgs.callPackage ./npm.nix { };
   npm-package = pkgs.callPackage ./npm-package.nix { };
+  npm-lock-generate = pkgs.callPackage ./npm-lock-generate { };
   pnpm = pkgs.callPackage ./pnpm.nix { };
   maven = pkgs.callPackage ./maven.nix { };
   mix = pkgs.callPackage ./mix.nix { };

tests/testpkgs/npm-lock-generate/default.nix

@@ -0,0 +1,23 @@
+{
+  buildNpmPackage,
+  fetchFromGitHub,
+}:
+
+buildNpmPackage rec {
+  pname = "emmet-language-server";
+  version = "2.5.0";
+
+  src = fetchFromGitHub {
+    owner = "olrtg";
+    repo = "emmet-language-server";
+    rev = "v${version}";
+    hash = "sha256-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=";
+  };
+
+  npmDepsHash = "sha256-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=";
+
+  postPatch = ''
+    cp ${./package-lock.json} ./package-lock.json
+  '';
+
+}