diff --git a/tests/test_pr_review_autofix_context.py b/tests/test_pr_review_autofix_context.py
new file mode 100644
index 000000000..611790eee
--- /dev/null
+++ b/tests/test_pr_review_autofix_context.py
@@ -0,0 +1,27 @@
+"""Tests for pr_review_autofix_context.py."""
+
+import pytest
+import sys
+import os
+
+sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "scripts", "ci")))
+import pr_review_autofix_context
+from pr_review_autofix_context import repo_parts
+
+def test_repo_parts_valid():
+    """Test repo_parts with valid OWNER/NAME formats."""
+    assert repo_parts("owner/name") == ("owner", "name")
+    assert repo_parts("octocat/Hello-World") == ("octocat", "Hello-World")
+
+def test_repo_parts_invalid():
+    """Test repo_parts with invalid formats that should raise ValueError."""
+    invalid_cases = [
+        "ownername",  # missing slash
+        "/name",      # missing owner
+        "owner/",     # missing name
+        "",           # empty string
+        "/",          # just slash
+    ]
+    for case in invalid_cases:
+        with pytest.raises(ValueError, match="repo must be OWNER/NAME, got"):
+            repo_parts(case)