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The Unicode checks in wallet_basic.py toggle ensure_ascii on the RPC coverage wrapper. Previously, this assignment did not update the wrapped AuthServiceProxy.
Additionally, method proxies created by AuthServiceProxy.__getattr__() and wallet URI proxies created by AuthServiceProxy.__truediv__() did not preserve the setting. As a result, both iterations of the test serialized Unicode using the default ensure_ascii=True behavior.
Forward ensure_ascii through AuthServiceProxyWrapper and preserve it when creating method and wallet URI proxies.
Add a framework unit test that captures the actual HTTP request body and checks escaped JSON and direct UTF-8 serialization for both BMP and supplementary-plane characters.
Tested by:
python3 test/functional/feature_framework_unit_tests.py
pipx run --spec 'ruff==0.16.0' ruff check \
test/functional/test_framework/authproxy.py \
test/functional/test_framework/coverage.py \
test/functional/feature_framework_unit_tests.py
