Function assert

test/fallback.ts:137–145

(condition: boolean, msg: string)

  let failed = 0;

  function assert(condition: boolean, msg: string) {
    if (condition) {
      console.log(`  ✓ ${msg}`);
      passed++;
    } else {
      console.error(`  ✗ FAIL: ${msg}`);
      failed++;
    }
  }

  // Start mock BlockRun API
  const mockApi = await startMockServer();