flagsmith-nodejs/tests/sdk/offline-handlers.test.ts

Flagsmith lets you manage features flags and remote config across web, mobile and server side applications. Deliver true Continuous Integration. Get builds out faster. Control who has access to new features.

import * as fs from 'fs';
import { LocalFileHandler } from '../../sdk/offline_handlers.js';
import { EnvironmentModel } from '../../flagsmith-engine/index.js';

import * as offlineEnvironment from './data/offline-environment.json';

vi.mock('fs');

const offlineEnvironmentString = JSON.stringify(offlineEnvironment);

test('local file handler', () => {
    const environmentDocumentFilePath = '/some/path/environment.json';

    // Mock the fs.readFileSync function to return environmentJson

    const readFileSyncMock = vi.spyOn(fs, 'readFileSync');
    readFileSyncMock.mockImplementation(() => offlineEnvironmentString);

    // Given
    const localFileHandler = new LocalFileHandler(environmentDocumentFilePath);

    // When
    const environmentModel = localFileHandler.getEnvironment();

    // Then
    expect(environmentModel).toBeInstanceOf(EnvironmentModel);
    expect(environmentModel.apiKey).toBe('B62qaMZNwfiqT76p38ggrQ');
    expect(readFileSyncMock).toHaveBeenCalledWith(environmentDocumentFilePath, 'utf8');

    // Restore the original implementation of fs.readFileSync
    readFileSyncMock.mockRestore();
});