core/tests/rules/cross-tenant-transfer.test.js

import { Arbiter } from '../../src/core/Arbiter.js';
import { describe, it, beforeEach } from 'node:test';
import assert from 'node:assert/strict';

describe('Cross-Tenant Transfer — accountIsPlatform root bridge', () => {
  let arbiter;

  beforeEach(() => {
    arbiter = new Arbiter({ embeddingDimensions: 256 });

    ['account:tenant_a:main', 'account:tenant_a:savings',
     'account:tenant_b:main', 'account:root:platform'].forEach((a) => arbiter.addNode(a, 'account'));

    arbiter.addNode('session:s_test', 'session');
    arbiter.addNode('user:admin', 'admin');
    arbiter.addNode('user:admin_b', 'admin');
  });

  function addRelation(src, rel, dst, p = 1.0) {
    arbiter.addRelation(src, rel, dst, { possibility: p });
  }

  function checkRelation(actor, rel, object) {
    const cfg = { type: 'direct', relation: rel };
    if (!arbiter._relationConfigs) arbiter._relationConfigs = {};
    arbiter._relationConfigs = arbiter._relationConfigs || {};
    arbiter.setRelationConfig(rel, cfg);
    return arbiter.authChecker.check(actor, rel, object);
  }

  it('controls relations grant admin access to accounts', () => {
    addRelation('user:admin', 'controls', 'account:tenant_a:main');
    addRelation('user:admin', 'controls', 'account:tenant_b:main');
    addRelation('user:admin', 'controls', 'account:root:platform');

    const r1 = checkRelation('user:admin', 'controls', 'account:tenant_a:main');
    const r2 = checkRelation('user:admin', 'controls', 'account:tenant_b:main');
    const rp = checkRelation('user:admin', 'controls', 'account:root:platform');

    assert.ok(r1.possibility > 0.5, `tenant_a controls=${r1.possibility}`);
    assert.ok(r2.possibility > 0.5, `tenant_b controls=${r2.possibility}`);
    assert.ok(rp.possibility > 0.5, `root controls=${rp.possibility}`);
  });

  it('sameTenantAccount exists for same-tenant pair, absent for cross-tenant', () => {
    addRelation('account:tenant_a:main', 'sameTenantAccount', 'account:tenant_a:savings');

    const same = checkRelation('account:tenant_a:main', 'sameTenantAccount', 'account:tenant_a:savings');
    const cross = checkRelation('account:tenant_a:main', 'sameTenantAccount', 'account:tenant_b:main');

    assert.ok(same.possibility > 0.5, `same-tenant possibility=${same.possibility}`);
    assert.ok(cross.possibility < 0.5, `cross-tenant possibility=${cross.possibility}`);
  });

  it('accountIsPlatform only applies to root platform account (code 9999)', () => {
    addRelation('session:s_test', 'accountIsPlatform', 'account:root:platform');

    const isPlatform = checkRelation('session:s_test', 'accountIsPlatform', 'account:root:platform');
    const notPlatform = checkRelation('session:s_test', 'accountIsPlatform', 'account:tenant_a:main');

    assert.ok(isPlatform.possibility > 0.5, 'root IS platform');
    assert.ok(notPlatform.possibility < 0.5, 'regular account is NOT platform');
  });

  it('within-tenant transfer path: controls + sameTenantAccount', () => {
    addRelation('user:admin', 'controls', 'account:tenant_a:main');
    addRelation('user:admin', 'controls', 'account:tenant_a:savings');
    addRelation('account:tenant_a:main', 'sameTenantAccount', 'account:tenant_a:savings');
    addRelation('session:s_test', 'authenticated_as', 'user:admin');

    const hasControls = checkRelation('user:admin', 'controls', 'account:tenant_a:main');
    const sameTenant = checkRelation('account:tenant_a:main', 'sameTenantAccount', 'account:tenant_a:savings');

    assert.ok(hasControls.possibility > 0.5);
    assert.ok(sameTenant.possibility > 0.5);
  });

  it('cross-tenant transfer path: controls + platform bridge (accountIsPlatform)', () => {
    addRelation('user:admin', 'controls', 'account:tenant_a:main');
    addRelation('user:admin', 'controls', 'account:root:platform');
    addRelation('session:s_test', 'accountIsPlatform', 'account:root:platform');
    addRelation('session:s_test', 'authenticated_as', 'user:admin');

    const fromTenantA = checkRelation('user:admin', 'controls', 'account:tenant_a:main');
    const toRoot = checkRelation('user:admin', 'controls', 'account:root:platform');
    const isPlatform = checkRelation('session:s_test', 'accountIsPlatform', 'account:root:platform');

    assert.ok(fromTenantA.possibility > 0.5, 'tenant A debitable');
    assert.ok(toRoot.possibility > 0.5, 'root creditable');
    assert.ok(isPlatform.possibility > 0.5, 'root is platform bridge');
  });

  it('accountIsSettled blocks transfers (NEVER gate on debit)', () => {
    addRelation('user:admin', 'controls', 'account:tenant_a:main');
    addRelation('account:tenant_a:main', 'accountIsSettled', 'account:tenant_a:main');

    const isSettled = checkRelation('account:tenant_a:main', 'accountIsSettled', 'account:tenant_a:main');
    assert.ok(isSettled.possibility > 0.5, 'account should be flagged as settled');
  });
});