diff --git a/tests/test_pr_review_autofix_context_check_summary.py b/tests/test_pr_review_autofix_context_check_summary.py
new file mode 100644
index 000000000..7e3a7759f
--- /dev/null
+++ b/tests/test_pr_review_autofix_context_check_summary.py
@@ -0,0 +1,99 @@
+"""Tests for the check_summary function in pr_review_autofix_context.py."""
+
+from typing import Any
+
+from scripts.ci.pr_review_autofix_context import check_summary
+
+
+def test_check_summary_none_or_empty() -> None:
+    """Test check_summary with None or an empty list."""
+    assert check_summary(None) == []
+    assert check_summary([]) == []
+
+
+def test_check_summary_checkrun_full() -> None:
+    """Test check_summary with a complete CheckRun node."""
+    data: list[dict[str, Any]] = [{
+        "__typename": "CheckRun",
+        "name": "lint",
+        "workflowName": "CI",
+        "status": "COMPLETED",
+        "conclusion": "SUCCESS",
+    }]
+    assert check_summary(data) == ["- CI/lint: COMPLETED SUCCESS"]
+
+
+def test_check_summary_checkrun_no_workflow() -> None:
+    """Test check_summary when a CheckRun node lacks a workflow name."""
+    data: list[dict[str, Any]] = [{
+        "__typename": "CheckRun",
+        "name": "lint",
+        "status": "COMPLETED",
+        "conclusion": "FAILURE",
+    }]
+    assert check_summary(data) == ["- lint: COMPLETED FAILURE"]
+
+
+def test_check_summary_checkrun_no_name() -> None:
+    """Test check_summary when a CheckRun node lacks a name."""
+    data: list[dict[str, Any]] = [{
+        "__typename": "CheckRun",
+        "workflowName": "CI",
+        "status": "IN_PROGRESS",
+    }]
+    # if name is missing, it falls back to "check"
+    assert check_summary(data) == ["- CI/check: IN_PROGRESS"]
+
+
+def test_check_summary_checkrun_no_name_no_workflow() -> None:
+    """Test check_summary when a CheckRun node lacks both name and workflow."""
+    data: list[dict[str, Any]] = [{
+        "__typename": "CheckRun",
+    }]
+    assert check_summary(data) == ["- check:"]
+
+
+def test_check_summary_status_context() -> None:
+    """Test check_summary with a StatusContext node."""
+    data: list[dict[str, Any]] = [{
+        "__typename": "StatusContext",
+        "context": "security",
+        "state": "SUCCESS",
+    }]
+    assert check_summary(data) == ["- security: SUCCESS"]
+
+
+def test_check_summary_unknown_typename() -> None:
+    """Test check_summary handles nodes with unknown or missing typenames gracefully."""
+    data: list[dict[str, Any]] = [{
+        "__typename": "Unknown",
+        "name": "lint",
+    }, {
+        "name": "missing_typename",
+    }]
+    assert check_summary(data) == []
+
+
+def test_check_summary_multiple() -> None:
+    """Test check_summary with multiple mixed nodes."""
+    data: list[dict[str, Any]] = [
+        {
+            "__typename": "CheckRun",
+            "name": "test",
+            "workflowName": "Tests",
+            "status": "COMPLETED",
+            "conclusion": "FAILURE",
+        },
+        {
+            "__typename": "StatusContext",
+            "context": "code-quality",
+            "state": "PENDING",
+        },
+        {
+            "__typename": "Unknown",
+        },
+    ]
+    assert check_summary(data) == [
+        "- Tests/test: COMPLETED FAILURE",
+        "- code-quality: PENDING",
+    ]