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docs(dummies): clarify constraint satisfaction and collection deduplication #203

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13 changes: 8 additions & 5 deletions Dummies/README.nuget.md
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Expand Up @@ -34,8 +34,9 @@ matter — and that is the point.
`After`/`Before`/`Between`, quantities with `Positive`/`Between`/`NonZero`,
identities with `NonEmpty`/`DifferentFrom` — and deliberately no clock-relative
constraints: a reproducible test pins its reference instants explicitly.
- **Values built to satisfy the constraints** — never generate-then-filter, no retry
loops.
- **Values built to satisfy the constraints** — a scalar is constructed directly,
never generated-then-filtered. Only a *distinct* collection ever redraws, and only
to skip a duplicate: a **bounded** deduplicating draw, never an unbounded retry loop.
- **Conflicting constraints fail fast** with a clear, actionable
`ConflictingAnyConstraintException` at the moment the conflicting constraint is
declared — for example `Any.String().WithLength(3).StartingWith("ORD-")`.
Expand All @@ -44,10 +45,12 @@ matter — and that is the point.
constructor lambdas — from two up to eight constrained parts.
- **Collections over any element generator**: `Any.ListOf(item)`, `ArrayOf`,
`SequenceOf`, `SetOf` and `DictionaryOf`, constrained with
`WithCount`/`NonEmpty`/`Distinct`/`Containing`. A distinct collection asked for more
`WithCount`/`NonEmpty`/`Distinct`/`Containing`. Ask a distinct collection for more
distinct elements than its effective domain — the element generator plus any values
pinned outside it with `Containing` — can produce fails fast, just like any other
conflict; `Any.PairOf`/`TripleOf` pair generators into value tuples.
pinned outside it with `Containing` — can supply, and it fails fast, just like any
other conflict, wherever that domain is countable; where it is not, the same
shortfall instead surfaces at generation as an `AnyGenerationException` naming the
seed to replay. `Any.PairOf`/`TripleOf` pair generators into value tuples.
- **Optional values**: `.OrNull()` turns any generator into one that is `null` about
half the time and otherwise a constrained value — the dummy for an optional field,
for value types (`int?`, `Guid?`, ...) and reference types alike.
Expand Down