pj faebfe379d test(folio): replace tautological properties with 4 domain invariants (#28)
* test(folio): replace tautological properties with 4 domain invariants

Drop properties that can't fail (e.g. List.size >= 0, balances are Long
integers) or that just check the extractor itself (account_count equals
accounts.length). Keep auth routing liveness, error-clear liveness, and
reachability goals.

Add four properties that target the real code paths:
- balanceMatchesTransactionDelta: a new ledger row shifts the balance
  by exactly its signed amount (credit +, debit -).
- totalEqualsSumOfAccounts: home total equals sum of per-account
  balances at every state, not only on home.
- balanceChangeRequiresActiveAccount: an account's balance can only
  change while that account is the active one in the navigator.
- duplicateAccountNamesRejected: account names are unique under the
  app's actual dedup rule (case-insensitive after trim).

* chore(folio): upgrade sdk-android to io.github.priyanshujain.sanderling:0.0.1-rc4

Group id moved from io.github.priyanshujain to
io.github.priyanshujain.sanderling in the rc4 publish.

* chore(folio): pin @sanderling/spec to 0.0.1-rc4
2026-04-21 17:53:55 +07:00

sanderling

Autonomous property-based testing for mobile apps. Specs in TypeScript. Core in Go. Drives the app under test through Maestro and an in-app SDK.

Alpha. Android emulator only. Full scope in the v0.1.0 roadmap.

Docs

After a sanderling test run, browse traces locally with sanderling inspect. It opens a web UI for stepping through actions, screenshots, snapshots, residual formulas, and exceptions.


sanderling

sanderling, a wading bird that probes the shoreline for bugs that lie beneath.

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