diff --git a/tests/test_graphar.py b/tests/test_graphar.py
index 908dd78..f2ef066 100644
--- a/tests/test_graphar.py
+++ b/tests/test_graphar.py
@@ -1,18 +1,57 @@
-import yaml
 from icebug_format.graphar import YamlGraphInfo
 
-def test_yaml_parser_fallback_loads_empty_graph(tmp_path):
-    """Test that our fallback YAML parser can read a basic graph configuration."""
-    yaml_content = {
-        "vertices": [],
-        "edges": []
-    }
-    yaml_file = tmp_path / "test.graph.yml"
+def test_yaml_parser_fallback_loads_simple_graph(tmp_path):
+    # 1. Write the exact validated Vertex YAML
+    vertex_file = tmp_path / "person.vertex.yml"
+    vertex_file.write_text("""type: person
+version: gar/v1
+chunk_size: 100
+prefix: vertex/person/
+property_groups:
+  - prefix: id/
+    file_type: parquet
+    properties:
+      - name: id
+        data_type: int64
+        is_primary: true
+""")
 
-    with open(yaml_file, "w") as f:
-        yaml.dump(yaml_content, f)
+    # 2. Write the exact validated Edge YAML
+    edge_file = tmp_path / "person_knows_person.edge.yml"
+    edge_file.write_text("""src_type: person
+edge_type: knows
+dst_type: person
+version: gar/v1
+chunk_size: 1024
+prefix: edge/person_knows_person/
+directed: true
+adj_lists:
+  - ordered: false
+    aligned_by: src
+    prefix: unordered_by_src/
+    file_type: parquet
+""")
 
-    graph_info = YamlGraphInfo.load(str(yaml_file))
+    # 3. Write the exact validated Graph YAML
+    graph_file = tmp_path / "test.graph.yml"
+    graph_file.write_text("""name: simple_graph
+version: gar/v1
+vertices:
+  - person.vertex.yml
+edges:
+  - person_knows_person.edge.yml
+""")
 
-    assert graph_info.vertex_info_num() == 0
-    assert graph_info.edge_info_num() == 0
\ No newline at end of file
+    graph_info = YamlGraphInfo.load(str(graph_file))
+
+    assert graph_info.vertex_info_num() == 1
+    v_info = graph_info.get_vertex_info_by_index(0)
+    assert v_info.get_type() == "person"
+    assert v_info.get_prefix() == "vertex/person/"
+
+    assert graph_info.edge_info_num() == 1
+    e_info = graph_info.get_edge_info_by_index(0)
+    assert e_info.get_edge_type() == "knows"
+    assert e_info.get_src_type() == "person"
+    assert e_info.get_dst_type() == "person"
+    assert e_info.get_prefix() == "edge/person_knows_person/"
\ No newline at end of file