Experimental `_pytest.ensemble` API: nested configs + in-memory collection (PoC) - #14809

Draft

RonnyPfannschmidt wants to merge 26 commits into

pytest-dev:mainfrom

RonnyPfannschmidt:scenario-api-poc

Commits on Sep 15, 2026

config: split Config.parse into phase methods
RonnyPfannschmidt
committed
5948fe5
config: let get_config() take an explicit invocation dir
RonnyPfannschmidt
committed
3be5342
python: make Class.from_parent honor a passed obj
RonnyPfannschmidt
committed
9fdc952
debugging: trace via pytest_runtest_call instead of pytest_pyfunc_call
RonnyPfannschmidt
committed
102325a
ensemble: build a hermetic nested Config from declarative data
RonnyPfannschmidt
committed
a981dbb
ensemble: collect and run in-memory sources, record typed results
RonnyPfannschmidt
committed
ac2cbea
testing: convert pytester-based tests to _pytest.ensemble
RonnyPfannschmidt
committed
3653e85
bench: compare pytester and ensemble run costs
RonnyPfannschmidt
committed
41d71ea
ensemble: apply addopts and ini overrides when building a config
RonnyPfannschmidt
committed
29607a5
config, debugging: render without a terminal reporter
RonnyPfannschmidt
committed
7ca9c89
setuponly, setupplan: normalize options at configure time
RonnyPfannschmidt
committed
cdd7187
ensemble: do not let a config take ownership of a spec's ini values
RonnyPfannschmidt
committed
dda40d9
ensemble: stop swallowing collection failures
RonnyPfannschmidt
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a21ca3f
ensemble: make Ensemble.collect() idempotent
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71ab133
ensemble: give an ensemble its own output sink
RonnyPfannschmidt
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7683f84
ensemble: load the assertion plugin by default
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a85675b
ensemble: honour shouldfail/shouldstop between items
RonnyPfannschmidt
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8152a0c
ensemble: build the record after session teardown
RonnyPfannschmidt
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9ae99cc
ensemble: document the capture boundary honestly
RonnyPfannschmidt
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f773629
ensemble: keep configure-time warnings inside the ensemble
RonnyPfannschmidt
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6bf3923
terminal: let a private output stream count as captured
RonnyPfannschmidt
committed
d67e381
ensemble: run the items through pytest_runtestloop
RonnyPfannschmidt
committed
89821ec
ensemble: let a real module keep its own path
RonnyPfannschmidt
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dfaf969
ensemble: do not leave bytecode beside an imported script
RonnyPfannschmidt
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6001e26
fixtures: let a plugin declare that it has no fixtures
RonnyPfannschmidt
committed
c99f28d
ensemble: do not mask errors raised while building a config
RonnyPfannschmidt
committed
e6b9a2f

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Experimental `_pytest.ensemble` API: nested configs + in-memory collection (PoC) - #14809

Experimental `_pytest.ensemble` API: nested configs + in-memory collection (PoC)#14809
RonnyPfannschmidt wants to merge 26 commits into
pytest-dev:mainfrom
RonnyPfannschmidt:scenario-api-poc

Commits on Sep 15, 2026

config: split Config.parse into phase methods

config: let get_config() take an explicit invocation dir

python: make Class.from_parent honor a passed obj

debugging: trace via pytest_runtest_call instead of pytest_pyfunc_call

ensemble: build a hermetic nested Config from declarative data

ensemble: collect and run in-memory sources, record typed results

testing: convert pytester-based tests to _pytest.ensemble

bench: compare pytester and ensemble run costs

ensemble: apply addopts and ini overrides when building a config

config, debugging: render without a terminal reporter

setuponly, setupplan: normalize options at configure time

ensemble: do not let a config take ownership of a spec's ini values

ensemble: stop swallowing collection failures

ensemble: make Ensemble.collect() idempotent

ensemble: give an ensemble its own output sink

ensemble: load the assertion plugin by default

ensemble: honour shouldfail/shouldstop between items

ensemble: build the record after session teardown

ensemble: document the capture boundary honestly

ensemble: keep configure-time warnings inside the ensemble

terminal: let a private output stream count as captured

ensemble: run the items through pytest_runtestloop

ensemble: let a real module keep its own path

ensemble: do not leave bytecode beside an imported script

fixtures: let a plugin declare that it has no fixtures

ensemble: do not mask errors raised while building a config