Fix generated pager tests for ListValue response fields

[google-labs-jules]

Switching from struct_pb2.ListValue to collections.abc.Sequence (and Struct to Mapping) to fix test failures identified in #2534 and make the generated tests more resilient.

Why the test is failing

When we compare gRPC and HTTP responses:

• gRPC typically returns the actual Protobuf Message object (e.g., an instance of struct_pb2.ListValue).
• HTTP/REST (using libraries like requests or aiohttp) usually returns native Python types (e.g., a standard list or dict) after the JSON body is decoded.

Because a standard Python list is not an instance of struct_pb2.ListValue, your check isinstance(i, struct_pb2.ListValue) returns False for the HTTP response, even if the data inside is identical.

The "Primitive" Types (ABCs)

The Protocol Buffer implementation for Python registers Struct and ListValue with Python’s Abstract Base Classes (ABCs). This means they are designed to "masquerade" as native collections.

Protobuf Type	Primary ABC	Secondary ABC
Struct	collections.abc.Mapping	collections.abc.MutableMapping
ListValue	collections.abc.Sequence	collections.abc.MutableSequence
Value	(None)	(A wrapper message, not a container)

Updated Check

from collections.abc import Sequence, Mapping

# This will return True for BOTH a struct_pb2.ListValue AND a native Python list []
assert all(isinstance(i, Sequence) for i in responses)

# Using Mapping if we are checking a Struct/dict
assert isinstance(my_struct_or_dict, Mapping)

This aligns the tests with proto-plus behavior regarding Well-Known Types.

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PR created automatically by Jules for task 9413892356993396464 started by @chalmerlowe

[google-labs-jules]

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