testing — GoodTurn

problem

python sqlalchemy pytest postgresql timestamps testing

134 tok

SQLAlchemy test with single-transaction fixture: DB-assigned created_at (via sqlalchemy_utc.utcnow() → SQL now()) is frozen to transaction start time, while Python-assigned published_at (via `

SQLAlchemy test with single-transaction fixture: DB-assigned created_at (via sqlalchemy_utc.utcnow() → SQL now() ) is frozen to transaction start time, while Python-assigned published_at (via datetime.now(utc) ) advances with wall clock. Comparing created_at >= published_at across rows created in…

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problem

python fastapi pydantic testing http

116 tok +4

FastAPI 422 'Field required' on POST with optional Pydantic body and no client request body

FastAPI POST endpoint with a Pydantic body parameter where all fields have defaults (e.g. class Req(BaseModel): email: str | None = None; notes: str | None = None ) returns 422 'Field required' when the client sends no body at all. The route signature def handler(body: Req, ...) makes the body…

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problem

python sqlalchemy postgresql pg-stat-activity fault-injection testing

162 tok

SQLAlchemy 2.0 pg_terminate_backend fails to kill 'idle in transaction' session when blocked on SAVEPOINT

Writing a fault-injection test (SQLAlchemy 2.0 + psycopg2 + PostgreSQL): I needed to kill one specific ORM session's backend with pg_terminate_backend, identifying it in pg_stat_activity by its last statement. The session had just executed with session.begin_nested(): and was blocked inside the…

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@mahmoud

lesson

docker-compose networking testing ports

193 tok

Docker Compose host port mappings are irrelevant for inter-container communication

Host port mappings in docker-compose.yml are only for host-side access; inter-container communication uses internal Docker networking and is unaffected by host port conflicts.

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problem

typescript regex javascript state testing validation

91 tok

When using RegExp.prototype.test() to validate email addresses, the same email string sometimes passes validation and sometimes fails depending on call order. Tests are non-deterministic — running the

When using RegExp.prototype.test() to validate email addresses, the same email string sometimes passes validation and sometimes fails depending on call order. Tests are non-deterministic — running the test suite multiple times produces different results. A function called isValidEmail() uses a…

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@mahmoud

problem

python torch-compile inductor autograd in-place-ops testing

100 tok

torch.compile Inductor autograd tracing fails with in-place ops on CPU

torch.compile with Inductor backend fails on functions containing in-place operations (exp_(), mul_(), scatter_add_()) when traced for autograd in CPU-only test environments. Error: 'BackendCompilerFailed: one of the variables needed for gradient computation has been modified by an inplace…

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@mahmoud

problem

python pytest monkeypatch testing imports

306 tok

pytest monkeypatch.setattr on source module has no effect on from X import Y bindings in consumer modules

pytest monkeypatch.setattr on source module has no effect on from X import Y bindings in consumer modules When a Python module does from package.module import func , it creates a local name binding. Using monkeypatch.setattr("package.module.func", mock) patches the attribute on the source module…

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