feat: add MCP+Agno integration docs and report chart tests

tests/unit/test_report_chart.py

@@ -0,0 +1,74 @@
+import io
+
+import pytest
+
+from agentic_security.report_chart import (
+    _generate_identifiers,
+    generate_identifiers,
+    plot_security_report,
+)
+
+
+class TestGenerateIdentifiers:
+    def test_single_row(self):
+        data = type("DF", (), {"__len__": lambda s: 1})()
+        result = _generate_identifiers(data)
+        assert result == ["A1"]
+
+    def test_multiple_rows(self):
+        data = type("DF", (), {"__len__": lambda s: 5})()
+        result = _generate_identifiers(data)
+        assert result == ["A1", "A2", "A3", "A4", "A5"]
+
+    def test_alphabet_wraparound(self):
+        data = type("DF", (), {"__len__": lambda s: 27})()
+        result = _generate_identifiers(data)
+        assert result[0] == "A1"
+        assert result[25] == "Z1"
+        assert result[26] == "A2"
+
+    def test_empty_dataframe(self):
+        data = type("DF", (), {"__len__": lambda s: 0})()
+        result = _generate_identifiers(data)
+        assert result == []
+
+    def test_public_generate_identifiers(self):
+        import pandas as pd
+
+        df = pd.DataFrame({"a": [1, 2, 3]})
+        result = generate_identifiers(df)
+        assert result == ["A1", "A2", "A3"]
+
+
+class TestPlotSecurityReport:
+    def test_returns_bytesio(self):
+        table_data = [
+            {"module": "test", "failureRate": 10.0, "tokens": 100},
+        ]
+        result = plot_security_report(table_data)
+        assert isinstance(result, io.BytesIO)
+
+    def test_multiple_modules(self):
+        table_data = [
+            {"module": "mod_a", "failureRate": 5.0, "tokens": 50},
+            {"module": "mod_b", "failureRate": 15.0, "tokens": 200},
+            {"module": "mod_c", "failureRate": 25.0, "tokens": 500},
+        ]
+        result = plot_security_report(table_data)
+        assert result.getvalue() != b""
+
+    def test_handles_empty_data(self):
+        result = plot_security_report([])
+        assert isinstance(result, io.BytesIO)
+
+    def test_handles_missing_keys(self):
+        table_data = [{"module": "test"}]
+        result = plot_security_report(table_data)
+        assert isinstance(result, io.BytesIO)
+
+    def test_handles_none_values(self):
+        table_data = [
+            {"module": "test", "failureRate": None, "tokens": None},
+        ]
+        result = plot_security_report(table_data)
+        assert isinstance(result, io.BytesIO)