test multi-source validation

and include missing fields

Author: AlbertDeFusco

tests/test_multi_source.py

@@ -0,0 +1,87 @@
+"""
+Integration tests with multiple sources
+"""
+
+from typing import Tuple, Type, Union
+
+from pydantic import BaseModel, ValidationError
+import pytest
+
+from pydantic_settings import (
+    BaseSettings,
+    JsonConfigSettingsSource,
+    PydanticBaseSettingsSource,
+    SettingsConfigDict,
+)
+
+def test_line_errors_from_source(monkeypatch, tmp_path):
+    monkeypatch.setenv("SETTINGS_NESTED__NESTED_FIELD", "a")
+    p = tmp_path / 'settings.json'
+    p.write_text(
+        """
+    {"foobar": 0, "null_field": null}
+    """
+    )
+
+    class Nested(BaseModel):
+        nested_field: int
+
+    class Settings(BaseSettings):
+        model_config = SettingsConfigDict(
+            json_file=p,
+            env_prefix="SETTINGS_",
+            env_nested_delimiter="__",
+            validate_each_source=True
+        )
+        foobar: str
+        nested: Nested
+        null_field: Union[str, None]
+        extra: bool
+
+        @classmethod
+        def settings_customise_sources(
+            cls,
+            settings_cls: Type[BaseSettings],
+            init_settings: PydanticBaseSettingsSource,
+            env_settings: PydanticBaseSettingsSource,
+            dotenv_settings: PydanticBaseSettingsSource,
+            file_secret_settings: PydanticBaseSettingsSource,
+        ) -> Tuple[PydanticBaseSettingsSource, ...]:
+            return (
+                JsonConfigSettingsSource(settings_cls),
+                env_settings,
+                init_settings
+            )
+
+    with pytest.raises(ValidationError) as exc_info:
+        _ = Settings(null_field=0)
+
+    assert exc_info.value.errors(include_url=False) == [
+        {
+            'ctx': {'source': 'JsonConfigSettingsSource'},
+            'input': 0,
+            'loc': ('foobar',),
+            'msg': 'Input should be a valid string',
+            'type': 'string_type',
+        },
+        {
+            'ctx': {'source': 'EnvSettingsSource'},
+            'input': 'a',
+            'loc': ('nested', 'nested_field'),
+            'msg': 'Input should be a valid integer, unable to parse string as an integer',
+            'type': 'int_parsing'
+        },
+        {
+            'ctx': {'source': 'InitSettingsSource'},
+            'input': 0,
+            'loc': ('null_field',),
+            'msg': 'Input should be a valid string',
+            'type': 'string_type'
+        },
+        {
+            'input': {'foobar': 0, 'nested': {'nested_field': 'a'}, 'null_field': None},
+            'loc': ('extra',),
+            'msg': 'Field required',
+            'type': 'missing'
+        }
+    ]