add str & stringfield tests

tests/product/generated/test_generated_v1.py

@@ -7,6 +7,7 @@
 from mindee.parsing.generated.generated_list import GeneratedListField
 from mindee.parsing.generated.generated_object import GeneratedObjectField
 from mindee.parsing.standard.position import PositionField
+from mindee.parsing.standard.text import StringField
 from mindee.product.generated.generated_v1 import GeneratedV1
 from mindee.product.generated.generated_v1_document import GeneratedV1Document
 from mindee.product.generated.generated_v1_page import GeneratedV1Page
@@ -156,6 +157,14 @@ def test_invoice_v4_complete_doc(invoice_v4_complete_doc) -> None:
         invoice_v4_complete_doc.inference.prediction.fields["locale"],
         GeneratedObjectField,
     )
+    assert isinstance(
+        invoice_v4_complete_doc.inference.prediction.fields["locale"].currency,
+        str,
+    )
+    assert isinstance(
+        invoice_v4_complete_doc.inference.prediction.fields["document_type"],
+        StringField,
+    )
     assert isinstance(
         invoice_v4_complete_doc.inference.prediction.fields[
             "supplier_company_registrations"