mobx computed behaviour test case

case.js

import { whyRun, observable, computed } from 'mobx';

class Store {
  @observable value = false;

  @computed get notValue() {
    whyRun();
    return !this.value;
  }
}

it('computes once only', () => {
  const store = new Store();
  console.log(store.notValue);
  console.log(store.notValue);
  console.log(store.notValue);
})

result.log

% jest app/bundles/admin-mojo/components/Groups/Details/__tests__/case.jsx
 PASS  app/bundles/admin-mojo/components/Groups/Details/__tests__/case.jsx
  ✓ computes once only (7ms)

Test Suites: 1 passed, 1 total
Tests:       1 passed, 1 total
Snapshots:   0 total
Time:        1.828s, estimated 2s
Ran all test suites matching "app/bundles/admin-mojo/components/Groups/Details/__tests__/case.jsx".
  console.log node_modules/mobx/lib/mobx.js:3369
    whyRun() can only be used if a derivation is active, or by passing an computed value / reaction explicitly. If you invoked whyRun from inside a computation; the computation is currently suspended but re-evaluating because somebody requested its value.

  console.log app/bundles/admin-mojo/components/Groups/Details/__tests__/case.jsx:14
    true

  console.log node_modules/mobx/lib/mobx.js:3369
    whyRun() can only be used if a derivation is active, or by passing an computed value / reaction explicitly. If you invoked whyRun from inside a computation; the computation is currently suspended but re-evaluating because somebody requested its value.

  console.log app/bundles/admin-mojo/components/Groups/Details/__tests__/case.jsx:15
    true

  console.log node_modules/mobx/lib/mobx.js:3369
    whyRun() can only be used if a derivation is active, or by passing an computed value / reaction explicitly. If you invoked whyRun from inside a computation; the computation is currently suspended but re-evaluating because somebody requested its value.

  console.log app/bundles/admin-mojo/components/Groups/Details/__tests__/case.jsx:16
    true