test: fix pyright strict-mode errors in tests/test_observable (batch 2)

[github-actions]

🤖 This is an automated PR from Repo Assist.

Continuing the incremental pyright strict-mode cleanup of tests/test_observable/. This is batch 2, following #778 (ruff cleanup) and #780 (pyright batch 1).

What changed

Fixed pyright strict-mode type errors in 30 files under tests/test_observable/ (targeting files with 1–7 errors each). All 260 tests across these files still pass.

Error patterns addressed

Pattern	Fix
_raise("string")	_raise(Exception("string")) — _raise is typed (Exception) -> None
def action(): as on_next callback	def action(_): — OnNext[T] requires one parameter
Notification union-attr access (.kind, .value, .exception)	# type: ignore[union-attr] — correct at runtime, not statically narrowable
subscribe(scheduler="not_set")	subscribe(scheduler=None) — Subscription[T] requires `SchedulerBase
lambda x: x as on_next	lambda x: None — OnNext[T] must return None
generate(0, ..., lambda x: x+1)	# type: ignore[arg-type] on iterate — Literal[0] inference mismatch
do_action callback returning int	Removed return statement
factory(ex: Exception) in on_error_resume_next	`factory(ex: Exception
return lambda: None in subscribe	return None
Unbound variables inside assertRaises	Hoisted assignments before the block

Files changed

test_amb, test_average, test_combinelatest, test_concat, test_debounce, test_defer, test_delay, test_doaction, test_elementat, test_empty, test_expand, test_filter, test_fromcallback, test_generate, test_interval, test_map, test_observeon, test_of, test_onerrorresumenext, test_reduce, test_repeat, test_retry, test_returnvalue, test_skipuntil, test_takeuntil, test_throw, test_timer, test_tofuture, test_toiterable, test_while_do

Next steps

There are ~940 more pyright errors remaining in tests/test_observable/ (in files with higher error counts). Future batches will continue working through them until the directory can be removed from the pyright exclude list in pyproject.toml.

Warning

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Note

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[coveralls]

coverage: 93.519% (+0.003%) from 93.516% — repo-assist/pyright-cleanup-test-observable-2026-04-26-3187c4c0696b18d4 into master