chore: establish project baseline

central/tests/test_ncm_payload.py

@@ -0,0 +1,17 @@
+import pytest
+
+from central.app.datasets.ncm import parse_ncm_payload
+
+
+def test_parser_accepts_verified_siscomex_payload_shape():
+    payload = b'{"Data_Ultima_Atualizacao_NCM":"Vigente em 17/09/2026","Ato":"Resolucao Gecex 926/2026","Nomenclaturas":[{"Codigo":"08043000","Descricao":"Abacaxis.","Data_Inicio":"01/04/2022","Data_Fim":"31/12/9999"}]}'
+
+    parsed = parse_ncm_payload(payload)
+
+    assert parsed.version == "Vigente em 17/09/2026"
+    assert parsed.entries[0].code == "08043000"
+
+
+def test_parser_rejects_unknown_payload_shape():
+    with pytest.raises(ValueError, match="Nomenclaturas"):
+        parse_ncm_payload(b'{"items": []}')