Every service is unit tested with Prisma, OrganizationsService, and
StellarService mocked out — no real database or Soroban RPC call
happens in npm test. StellarService is mocked at the module level
(jest.mock('../stellar/stellar.service', ...)) rather than imported
for real, because @stellar/stellar-sdk ships transitive ESM-only
dependencies that need a wider transformIgnorePatterns to parse.
Run the suite:
npm testFor a true end-to-end check against a real Postgres and Soroban RPC,
see test/app.e2e-spec.ts (not run in CI yet — no database service is
provisioned there).