npm install --save-dev statsig-node       # Node
pip install statsig                        # Python

import statsig from 'statsig-node';

beforeAll(async () => {
  await statsig.initialize(process.env.STATSIG_SERVER_KEY!, {
    localMode: true,    // No network; all gates / configs return defaults
  });
});

afterAll(async () => {
  await statsig.shutdown();
});

test('user in treatment sees new UI', async () => {
  statsig.overrideGate('new_ui_gate', true, 'user-1');

  const enabled = await statsig.checkGate({ userID: 'user-1' }, 'new_ui_gate');
  expect(enabled).toBe(true);

  const disabledForOthers = await statsig.checkGate({ userID: 'user-2' }, 'new_ui_gate');
  expect(disabledForOthers).toBe(false);
});

test('user in arm B sees increased font size', async () => {
  statsig.overrideConfig('font_size_experiment', { font_size: 20 }, 'user-1');

  const exp = await statsig.getExperiment({ userID: 'user-1' }, 'font_size_experiment');
  expect(exp.value).toEqual({ font_size: 20 });
});

test('same user always gets same arm (determinism)', async () => {
  const arm1 = await statsig.getExperiment({ userID: 'user-1' }, 'exp-x');
  const arm2 = await statsig.getExperiment({ userID: 'user-1' }, 'exp-x');
  expect(arm1.value).toEqual(arm2.value);
});

test('different users may get different arms', async () => {
  const arms = await Promise.all(
    Array.from({ length: 100 }, (_, i) =>
      statsig.getExperiment({ userID: `user-${i}` }, 'exp-x').then(e => e.value)
    )
  );
  const uniqueArms = new Set(arms.map(a => JSON.stringify(a)));
  expect(uniqueArms.size).toBeGreaterThan(1);
});

test('exposure logged on evaluation', async () => {
  const events: any[] = [];
  // Statsig SDK exposes a hook for testing event logging
  statsig.flush();  // Force flush any pending events
  // Inspect via test mock of the event-uploader
});

npm test

jobs:
  statsig-tests:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v5
      - uses: actions/setup-node@v4
      - run: npm ci
      - run: npm test
        env:
          STATSIG_SERVER_KEY: ${{ secrets.STATSIG_TEST_KEY }}