🧪 Add unit tests for split_repo function

tests/test_pr_review_merge_scheduler.py

@@ -0,0 +1,24 @@
+import sys
+from pathlib import Path
+import pytest
+
+sys.path.insert(0, str(Path(__file__).parent.parent / "scripts" / "ci"))
+import pr_review_merge_scheduler
+
+def test_split_repo_success():
+    assert pr_review_merge_scheduler.split_repo("owner/repo") == ("owner", "repo")
+
+def test_split_repo_success_multiple_slashes():
+    assert pr_review_merge_scheduler.split_repo("owner/repo/extra") == ("owner", "repo/extra")
+
+def test_split_repo_invalid():
+    with pytest.raises(ValueError, match="repo must be owner/name, got 'invalid'"):
+        pr_review_merge_scheduler.split_repo("invalid")
+
+def test_split_repo_empty_owner():
+    with pytest.raises(ValueError, match="repo must be owner/name, got '/repo'"):
+        pr_review_merge_scheduler.split_repo("/repo")
+
+def test_split_repo_empty_repo():
+    with pytest.raises(ValueError, match="repo must be owner/name, got 'owner/'"):
+        pr_review_merge_scheduler.split_repo("owner/")