diff --git a/tests/test_pr_review_merge_scheduler.py b/tests/test_pr_review_merge_scheduler.py
index d72be85..a9564ed 100644
--- a/tests/test_pr_review_merge_scheduler.py
+++ b/tests/test_pr_review_merge_scheduler.py
@@ -52,3 +52,87 @@ def test_error_path(capsys, monkeypatch):
     captured = capsys.readouterr()
     assert "Command failed" in captured.err
     assert "fake error message" in captured.err
+
+
+def test_has_current_head_approval_true_from_review_state():
+    pr = {
+        "headRefOid": "commit123",
+        "reviewDecision": "REVIEW_REQUIRED",
+        "reviews": {
+            "nodes": [
+                {
+                    "state": "APPROVED",
+                    "author": {"login": "opencode-agent"},
+                    "commit": {"oid": "commit123"},
+                }
+            ]
+        }
+    }
+    assert pr_review_merge_scheduler.has_current_head_approval(pr) is True
+
+
+def test_has_current_head_approval_true_from_review_decision():
+    pr = {
+        "headRefOid": "commit123",
+        "reviewDecision": "APPROVED",
+        "reviews": {
+            "nodes": []
+        }
+    }
+    assert pr_review_merge_scheduler.has_current_head_approval(pr) is True
+
+
+def test_has_current_head_approval_false():
+    pr = {
+        "headRefOid": "commit123",
+        "reviewDecision": "REVIEW_REQUIRED",
+        "reviews": {
+            "nodes": [
+                {
+                    "state": "CHANGES_REQUESTED",
+                    "author": {"login": "opencode-agent"},
+                    "commit": {"oid": "commit123"},
+                }
+            ]
+        }
+    }
+    assert pr_review_merge_scheduler.has_current_head_approval(pr) is False
+
+
+def test_has_current_head_approval_wrong_commit():
+    pr = {
+        "headRefOid": "commit123",
+        "reviewDecision": "REVIEW_REQUIRED",
+        "reviews": {
+            "nodes": [
+                {
+                    "state": "APPROVED",
+                    "author": {"login": "opencode-agent"},
+                    "commit": {"oid": "oldcommit456"},
+                }
+            ]
+        }
+    }
+    assert pr_review_merge_scheduler.has_current_head_approval(pr) is False
+
+
+def test_has_current_head_approval_wrong_author():
+    pr = {
+        "headRefOid": "commit123",
+        "reviewDecision": "REVIEW_REQUIRED",
+        "reviews": {
+            "nodes": [
+                {
+                    "state": "APPROVED",
+                    "author": {"login": "some-other-user"},
+                    "commit": {"oid": "commit123"},
+                }
+            ]
+        }
+    }
+    assert pr_review_merge_scheduler.has_current_head_approval(pr) is False
+
+
+def test_has_current_head_approval_missing_keys():
+    pr = {}
+    assert pr_review_merge_scheduler.has_current_head_approval(pr) is False