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test(stryker-js): draw only valid mutants in the planMutantTests generators #293

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Merged
ryanleecode merged 7 commits into from
Oct 12, 2026
Merged

test(stryker-js): draw only valid mutants in the planMutantTests generators #293

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9a4db28
test(stryker-js): draw only valid mutants in the planMutantTests gene…
systemfsoftware-maker Oct 10, 2026
034b3af
Merge remote-tracking branch 'origin/main' into stream-d/fix-plan-mut…
systemfsoftware-maker Oct 10, 2026
95a3d79
Merge remote-tracking branch 'origin/main' into stream-d/fix-plan-mut…
systemfsoftware-maker Oct 10, 2026
327af89
Merge branch 'main' into stream-d/fix-plan-mutant-tests-subsumption
ryanleecode Oct 10, 2026
795cfb3
Merge remote-tracking branch 'origin/main' into stream-d/fix-plan-mut…
systemfsoftware-maker Oct 11, 2026
1bb6f47
Merge branch 'main' into stream-d/fix-plan-mutant-tests-subsumption
ryanleecode Oct 12, 2026
915911f
Merge branch 'main' into stream-d/fix-plan-mutant-tests-subsumption
ryanleecode Oct 12, 2026
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5 changes: 5 additions & 0 deletions .changeset/plan-mutant-tests-lawful-mutants.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
"@systemfsoftware/stryker-js": none
---

Property-test generators for planMutantTests now draw only valid mutants.
35 changes: 27 additions & 8 deletions packages/stryker-js/src/__tests__/plan-mutant-tests.workflow.property.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -76,6 +76,14 @@ const isNoCoverageFilter = (filter: readonly string[] | undefined): boolean =>
const isNoCoverageRunPlan = (decision: PlannedEarlyResultMutant | PlannedRunMutant): boolean =>
S.is(PlannedRunMutant)(decision) && isNoCoverageFilter(decision.runOptions.testFilter)

const lawfulSubsumptionOf = (
mutant: Mutant.Mutant,
status: Mutant.MutantStatus | undefined,
): Mutant.Subsumption | undefined =>
Option.getOrUndefined(
Option.filter(Option.fromUndefinedOr(mutant.subsumption), Mutant.subsumptionMatchesStatus(status)),
)

const coverageCommandArb = Arbitrary.all([
Arbitrary.schema(Mutant.Mutant),
Arbitrary.schema(S.Literals(['off', 'all', 'perTest'])),
Expand All @@ -95,12 +103,7 @@ const coverageCommandArb = Arbitrary.all([
id: mutantId,
status: closed ? 'Ignored' : undefined,
statusReason: undefined,
subsumption: Option.getOrUndefined(
Option.filter(
Option.fromUndefinedOr(baseMutant.subsumption),
(subsumption) => Mutant.subsumptionMatchesStatus(subsumption, closed ? 'Ignored' : undefined),
),
),
subsumption: lawfulSubsumptionOf(baseMutant, closed ? 'Ignored' : undefined),
}),
],
timeOverheadMS: 1,
Expand Down Expand Up @@ -141,7 +144,15 @@ const orderedCommandArb = Arbitrary.all([
const killer = hasKiller && tests.length > 0 ? tests[killerPick % tests.length] : undefined
return MutantTestPlanCommand.make({
_tag: 'MutantTestPlanCommand',
mutants: [Mutant.Mutant.make({ ...baseMutant, id: mutantId, status: undefined, statusReason: undefined })],
mutants: [
Mutant.Mutant.make({
...baseMutant,
id: mutantId,
status: undefined,
statusReason: undefined,
subsumption: lawfulSubsumptionOf(baseMutant, undefined),
}),
],
timeOverheadMS: 1,
timeSpentAllTests: 1,
hitsByMutantId: { [mutantId]: 1 },
Expand All @@ -166,7 +177,15 @@ const staticKillerCommandArb = Arbitrary.all([
const killers = known.filter((_, index) => killerFlags[index] === true)
return MutantTestPlanCommand.make({
_tag: 'MutantTestPlanCommand',
mutants: [Mutant.Mutant.make({ ...baseMutant, id: mutantId, status: undefined, statusReason: undefined })],
mutants: [
Mutant.Mutant.make({
...baseMutant,
id: mutantId,
status: undefined,
statusReason: undefined,
subsumption: lawfulSubsumptionOf(baseMutant, undefined),
}),
],
timeOverheadMS: 1,
timeSpentAllTests: 1,
hitsByMutantId: { [mutantId]: 1 },
Expand Down
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