Function waitFor

packages/deno/test/deno-http.test.ts:47–53

(predicate)

      return null;
    },
    waitFor(predicate) {
      const already = transactions.find(predicate);
      if (already) return Promise.resolve(already);
      return new Promise<TransactionEvent>(resolve => {
        waiters.push({ predicate, resolve });
      });
    },
  };
}