mirror of
https://github.com/hwchase17/langchain
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79 lines
2.3 KiB
Python
79 lines
2.3 KiB
Python
"""Test PydanticOutputParser"""
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from enum import Enum
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from typing import Optional
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from pydantic import BaseModel, Field
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from langchain.output_parsers.pydantic import PydanticOutputParser
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from langchain.schema import OutputParserException
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class Actions(Enum):
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SEARCH = "Search"
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CREATE = "Create"
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UPDATE = "Update"
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DELETE = "Delete"
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class TestModel(BaseModel):
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action: Actions = Field(description="Action to be performed")
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action_input: str = Field(description="Input to be used in the action")
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additional_fields: Optional[str] = Field(
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description="Additional fields", default=None
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)
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for_new_lines: str = Field(description="To be used to test newlines")
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# Prevent pytest from trying to run tests on TestModel
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TestModel.__test__ = False # type: ignore[attr-defined]
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DEF_RESULT = """{
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"action": "Update",
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"action_input": "The PydanticOutputParser class is powerful",
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"additional_fields": null,
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"for_new_lines": "not_escape_newline:\n escape_newline: \\n"
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}"""
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# action 'update' with a lowercase 'u' to test schema validation failure.
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DEF_RESULT_FAIL = """{
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"action": "update",
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"action_input": "The PydanticOutputParser class is powerful",
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"additional_fields": null
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}"""
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DEF_EXPECTED_RESULT = TestModel(
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action=Actions.UPDATE,
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action_input="The PydanticOutputParser class is powerful",
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additional_fields=None,
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for_new_lines="not_escape_newline:\n escape_newline: \n",
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)
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def test_pydantic_output_parser() -> None:
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"""Test PydanticOutputParser."""
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pydantic_parser: PydanticOutputParser[TestModel] = PydanticOutputParser(
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pydantic_object=TestModel
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)
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result = pydantic_parser.parse(DEF_RESULT)
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print("parse_result:", result)
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assert DEF_EXPECTED_RESULT == result
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def test_pydantic_output_parser_fail() -> None:
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"""Test PydanticOutputParser where completion result fails schema validation."""
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pydantic_parser: PydanticOutputParser[TestModel] = PydanticOutputParser(
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pydantic_object=TestModel
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)
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try:
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pydantic_parser.parse(DEF_RESULT_FAIL)
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except OutputParserException as e:
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print("parse_result:", e)
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assert "Failed to parse TestModel from completion" in str(e)
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else:
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assert False, "Expected OutputParserException"
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