refactor: remove unused NPM_TO_COPY variable from build.py

Signed-off-by: d9pouces <github@19pouces.net>

tests/test_cli.py

@@ -33,7 +33,27 @@ def test_validate_valid_config(tmp_path) -> None:
 def test_validate_without_config_fails() -> None:
     result = runner.invoke(cli.app, ["validate"])
     assert result.exit_code != 0
-    assert "either --config or --config-env" in result.output
+    assert "either --config, --config-env" in result.output
+
+
+def _mock_urlopen(content: bytes) -> MagicMock:
+    response = MagicMock()
+    response.read.return_value = content
+    response.__enter__.return_value = response
+    response.__exit__.return_value = False
+    return MagicMock(return_value=response)
+
+
+def test_validate_from_config_url(monkeypatch) -> None:
+    monkeypatch.setattr(
+        "id_configurator.config.urllib.request.urlopen",
+        _mock_urlopen(json.dumps(MINIMAL_CONFIG).encode("utf-8")),
+    )
+    result = runner.invoke(
+        cli.app, ["validate", "--config-url", "https://example.invalid/config.json"]
+    )
+    assert result.exit_code == 0
+    assert "is valid" in result.stdout
 
 
 def test_list_modules() -> None: