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add fuzz test for write-only stack using the invariant_storeRoundTrip…
…_sameAsCrdtModel invariant. for this, we use a generators of FixtureEntities. includes some tweaks to some existing generators. had to turn off unicode for strings as it is not preserved well by database roundtrips (b/182713034). PiperOrigin-RevId: 363578372
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43 changes: 43 additions & 0 deletions
43
javatests/arcs/android/storage/FixtureEntitiesOperationsGenerator.kt
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package arcs.android.storage | ||
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||
import arcs.core.crdt.CrdtSet | ||
import arcs.core.crdt.VersionMap | ||
import arcs.core.data.RawEntity | ||
import arcs.core.entity.testutil.FixtureEntities | ||
import arcs.core.testutil.FuzzingRandom | ||
import arcs.core.testutil.Generator | ||
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/** | ||
* Generates a sequence of [CrdtSet.Operation<RawEntity>], using the FixtureEntity schema. The ops | ||
* can be applied in sequence to a CrdtSet and should all be valid. | ||
*/ | ||
class FixtureEntitiesOperationsGenerator( | ||
val s: FuzzingRandom, | ||
val sizeGenerator: Generator<Int> | ||
) : Generator<List<CrdtSet.Operation<RawEntity>>> { | ||
override fun invoke(): List<CrdtSet.Operation<RawEntity>> { | ||
val ops = mutableListOf<CrdtSet.Operation<RawEntity>>() | ||
// Keep track of the entities in the set, to generate valid remove ops. | ||
val entities = mutableSetOf<RawEntity>() | ||
repeat(sizeGenerator()) { | ||
when (s.nextLessThan(3)) { | ||
0 -> { | ||
val e = FixtureEntities.randomRawEntity(s) | ||
entities.add(e) | ||
ops.add(CrdtSet.Operation.Add("", VersionMap(), e)) | ||
} | ||
1 -> { | ||
entities.randomOrNull()?.also { | ||
ops.add(CrdtSet.Operation.Remove("", VersionMap(), it.id)) | ||
entities.remove(it) | ||
} | ||
} | ||
else -> { | ||
ops.add(CrdtSet.Operation.Clear("", VersionMap())) | ||
entities.clear() | ||
} | ||
} | ||
} | ||
return ops | ||
} | ||
} |
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