react-native-devtools-frontend/scripts/devtools_build.test.mjs

// Copyright 2025 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Run these tests with:
//
//   npx mocha scripts/devtools_build.test.mjs

import {assert} from 'chai';

import {FeatureSet} from './devtools_build.mjs';

describe('FeatureSet', () => {
  it('yields an empty set of arguments by default', () => {
    const featureSet = new FeatureSet();

    assert.isEmpty([...featureSet]);
  });

  it('can enable features', () => {
    const featureSet = new FeatureSet();

    featureSet.enable('DevToolsFreestyler');
    featureSet.enable('DevToolsWellKnown');

    assert.deepEqual([...featureSet], [
      '--enable-features=DevToolsFreestyler,DevToolsWellKnown',
    ]);
  });

  it('can enable features with parameters', () => {
    const featureSet = new FeatureSet();

    featureSet.enable('DevToolsFreestyler', {patching: true});
    featureSet.enable('DevToolsFreestyler', {user_tier: 'TESTERS', multimodal: true});
    featureSet.enable('DevToolsAiAssistancePerformanceAgent', {insights_enabled: true});

    assert.deepEqual([...featureSet], [
      '--enable-features=DevToolsAiAssistancePerformanceAgent:insights_enabled/true,DevToolsFreestyler:multimodal/true/patching/true/user_tier/TESTERS',
    ]);
  });

  it('can disable features', () => {
    const featureSet = new FeatureSet();

    featureSet.disable('MediaRouter');
    featureSet.disable('DevToolsAiGeneratedTimelineLabels');

    assert.deepEqual([...featureSet], [
      '--disable-features=DevToolsAiGeneratedTimelineLabels,MediaRouter',
    ]);
  });

  it('can disable and enable unrelated features', () => {
    const featureSet = new FeatureSet();

    featureSet.disable('MediaRouter');
    featureSet.enable('DevToolsAutomaticFileSystems');

    assert.deepEqual([...featureSet], [
      '--disable-features=MediaRouter',
      '--enable-features=DevToolsAutomaticFileSystems',
    ]);
  });

  it('can disable previously enabled features', () => {
    const featureSet = new FeatureSet();

    featureSet.enable('DevToolsFreestyler', {patching: true});
    featureSet.enable('DevToolsWellKnown');
    featureSet.disable('DevToolsFreestyler');

    assert.deepEqual([...featureSet], [
      '--disable-features=DevToolsFreestyler',
      '--enable-features=DevToolsWellKnown',
    ]);
  });

  it('can merge feature sets', () => {
    const fs1 = new FeatureSet();
    fs1.enable('DevToolsFreestyler', {patching: true});
    fs1.enable('DevToolsWellKnown');
    fs1.disable('MediaRouter');
    const fs2 = new FeatureSet();
    fs2.disable('DevToolsWellKnown');
    fs2.enable('DevToolsFreestyler', {multimodal: true});

    fs1.merge(fs2);

    assert.deepEqual([...fs1], [
      '--disable-features=DevToolsWellKnown,MediaRouter',
      '--enable-features=DevToolsFreestyler:multimodal/true/patching/true',
    ]);
    assert.deepEqual([...fs2], [
      '--disable-features=DevToolsWellKnown',
      '--enable-features=DevToolsFreestyler:multimodal/true',
    ]);
  });

  it('can parse --enable-features/--disable-features declarations', () => {
    assert.deepEqual(FeatureSet.parse('MediaRouter'), [
      {feature: 'MediaRouter', parameters: {}},
    ]);
    assert.deepEqual(FeatureSet.parse('DevToolsFreestyler:multimodal/true/patching/true'), [
      {feature: 'DevToolsFreestyler', parameters: {multimodal: 'true', patching: 'true'}},
    ]);
    assert.deepEqual(FeatureSet.parse('DevToolsFreestyler:multimodal/true,DevToolsWellKnown'), [
      {feature: 'DevToolsFreestyler', parameters: {multimodal: 'true'}},
      {feature: 'DevToolsWellKnown', parameters: {}},
    ]);
  });
});