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H2 UK fixture: expose composition-changing person mass through the SPI support channel #846

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Merged
MaxGhenis merged 1 commit into from
Sep 2, 2026
Merged

H2 UK fixture: expose composition-changing person mass through the SPI support channel #846

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1 change: 1 addition & 0 deletions changelog.d/h2-fixture-spi-composition.changed.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Make the hermetic UK H2 spine fixture expose SPI support-channel person-mass changes caused by household composition.
31 changes: 31 additions & 0 deletions packages/microcosm-build/tests/test_uk_graph.py
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Original file line number Diff line number Diff line change
Expand Up @@ -401,6 +401,37 @@ def test_spi_support_channel_declares_its_mass_change_and_cgt_clones_conserve()
assert graph.node("cgt_band_donors").mass == "free"


@pytest.mark.requires_uk
def test_spi_support_fixture_changes_person_mass_and_conserves_household_mass() -> None:
"""Keep H2 sensitive to support-channel composition changes."""

from pathlib import Path

from microcosm.build.uk_runtime.frs_spine import uk_frs_spine_seed_frame
from microcosm.build.uk_runtime.graph_kernels import fixture_stage_plan_inputs

root = Path(__file__).resolve().parents[3]
fixture = root / "packages/microcosm-graph/tests/fixtures/parity/uk_spine"
_, implementations = fixture_stage_plan_inputs(fixture / "sources")
before = implementations["frs_spine"](uk_frs_spine_seed_frame())
after = implementations["spi_support_channel"](before)

before_person_mass = before.stratum_mass()
after_person_mass = after.stratum_mass()
assert before_person_mass.index.equals(after_person_mass.index)
assert not np.isclose(
float(after_person_mass.sum()),
float(before_person_mass.sum()),
rtol=1e-9,
atol=0.0,
)

before_household_mass = before.weights_for("household").total
assert after.weights_for("household").total == before_household_mass
assert after.mass_log[-1].old_total == before_household_mass
assert after.mass_log[-1].new_total == before_household_mass


@pytest.mark.requires_uk
def test_driver_projects_a_stage_record_for_every_graph_stage_on_the_fixture(
tmp_path,
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96 changes: 48 additions & 48 deletions packages/microcosm-graph/tests/fixtures/parity/uk_spine/sources/benunit.csv
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Expand Up @@ -2,135 +2,135 @@ benunit_id,frs_benunit_capital,is_married,dependent_children
101,1.0_1000000000000000e+02,True,0
201,1.0_2000000000000000e+02,True,0
301,1.0_3000000000000000e+02,True,0
401,1.0_4000000000000000e+02,True,1
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11901,2.1_9000000000000000e+02,True,0
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10 changes: 5 additions & 5 deletions packages/microcosm-graph/tests/fixtures/parity/uk_spine/sources/fixture.json
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Expand Up @@ -531,8 +531,8 @@
"locator": "child.tab",
"role": "frs_table",
"runtime_sha256_required": true,
"sha256": "1c9648ffd2f13e080970a813fd26ee983011781d71e0cc762b06254b1d3bc4e5",
"size_bytes": 1915,
"sha256": "30f9fcabb0c54673e14c368e46627010b0b239c4305b2c4e4c46803d089c6fac",
"size_bytes": 1601,
"table": "child",
"vintage": "synthetic-h2"
}
Expand Down Expand Up @@ -973,7 +973,7 @@
"locator": "benunit.tab",
"role": "frs_table",
"runtime_sha256_required": true,
"sha256": "65b1abf29a565ccd15bf743a99cf8043475789b2c32c8dce42cf0d91b454657e",
"sha256": "2a1dacb6dcdb3c498fc9297f566e1367b7ae5191da5970b0300e3e873ce48f86",
"size_bytes": 2094,
"table": "benunit",
"vintage": "synthetic-h2"
Expand All @@ -984,8 +984,8 @@
"locator": "child.tab",
"role": "frs_table",
"runtime_sha256_required": true,
"sha256": "1c9648ffd2f13e080970a813fd26ee983011781d71e0cc762b06254b1d3bc4e5",
"size_bytes": 1915,
"sha256": "30f9fcabb0c54673e14c368e46627010b0b239c4305b2c4e4c46803d089c6fac",
"size_bytes": 1601,
"table": "child",
"vintage": "synthetic-h2"
},
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