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.agents/skills/design-system/scripts/tests/test_validate_tokens.py

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+"""Regression tests for validate-tokens.cjs.
+
+The validator used to skip any line containing ``var(--`` outright, so a
+hardcoded value sharing a line with a token reference (extremely common in
+real CSS, and universal in minified CSS where everything is one line) went
+undetected. These tests drive the CLI via ``node`` and assert it flags such
+cases. They are pytest-based so the repository's existing pytest CI runs them.
+"""
+
+import shutil
+import subprocess
+from pathlib import Path
+
+import pytest
+
+SCRIPT = Path(__file__).resolve().parent.parent / "validate-tokens.cjs"
+
+
+def _run(tmp_path: Path, css: str) -> subprocess.CompletedProcess:
+    node = shutil.which("node")
+    if not node:
+        pytest.skip("node not available")
+    (tmp_path / "sample.css").write_text(css)
+    return subprocess.run(
+        [node, str(SCRIPT), "--dir", str(tmp_path)],
+        capture_output=True,
+        text=True,
+    )
+
+
+def test_flags_hardcoded_hex_sharing_line_with_token(tmp_path):
+    """A hardcoded hex on the same line as a var() token is still a violation."""
+    result = _run(
+        tmp_path,
+        ".btn { background: #FF6B6B; color: var(--color-primary); }\n",
+    )
+    assert "#FF6B6B" in result.stdout, result.stdout
+    assert result.returncode == 1
+
+
+def test_token_only_line_reports_no_violation(tmp_path):
+    """A line that references only tokens produces no false positives."""
+    result = _run(
+        tmp_path,
+        ".btn { background: var(--color-bg); color: var(--color-primary); }\n",
+    )
+    assert "No token violations" in result.stdout, result.stdout
+    assert result.returncode == 0