foreign/node/src/wire/vsr/session.test.ts

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import assert from 'node:assert/strict';
import { describe, it } from 'node:test';
import { ConsensusSession } from './session.js';

describe('ConsensusSession', () => {
  it('starts unbound with a nonzero client ID', () => {
    const session = new ConsensusSession();
    assert.notEqual(session.clientId, 0n);
    assert.equal(session.session, null);
    assert.equal(session.currentRequestId(), 1n);
  });

  it('binds once to a positive server session', () => {
    const session = new ConsensusSession(7n);
    session.beginRegister();
    assert.throws(() => session.bind(0n), /must be > 0/);
    session.bind(42n);
    assert.equal(session.session, 42n);
    assert.throws(() => session.bind(43n), /already bound/);
  });

  it('advances metadata IDs monotonically', () => {
    const session = new ConsensusSession(7n);
    session.beginRegister();
    session.bind(42n);
    assert.equal(session.nextRequestId(), 1n);
    assert.equal(session.nextRequestId(), 2n);
    assert.equal(session.currentRequestId(), 3n);
  });

  it('rejects request IDs before binding and after exhaustion', () => {
    const session = new ConsensusSession(7n);
    assert.throws(
      () => session.nextRequestId(),
      /before bind/
    );
    session.bind(42n);
    (
      session as unknown as { requestCounter: bigint }
    ).requestCounter = 0xFFFF_FFFF_FFFF_FFFFn;
    assert.throws(
      () => session.nextRequestId(),
      /counter exhausted/
    );
  });

  it('rearms registration with a fresh client ID', () => {
    const session = new ConsensusSession(7n);
    session.beginRegister();
    session.bind(42n);
    session.beginRegister();
    assert.equal(session.session, null);
    assert.equal(session.currentRequestId(), 1n);
    assert.notEqual(session.clientId, 7n);
  });
});