Testing Library vs Enzyme in 2026: React Testing Approaches

TL;DR

Testing Library has won. Enzyme is effectively deprecated for React 18. @testing-library/react (~15M weekly downloads) is the standard for React component testing. Enzyme (~3M downloads, mostly legacy projects) has no official React 18 adapter and development has stalled. If you're on React 18+, use Testing Library. The only reason to use Enzyme today is if you're maintaining a legacy codebase that can't migrate.

Key Takeaways

• @testing-library/react: ~15M weekly downloads — Enzyme: ~3M (npm, March 2026)
• Enzyme has no official React 18 adapter — community adapters exist but are unstable
• Testing Library tests user behavior — Enzyme tests implementation details
• Testing Library is framework-agnostic — works for Vue, Angular, Svelte, DOM
• The philosophy difference matters — Testing Library's approach produces better tests

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The Core Philosophy Difference

This isn't just API preference — it's a fundamental difference in testing philosophy.

Enzyme's approach: Test what the component does internally — its state, methods, props, child component instances.

Testing Library's approach: Test what the user sees and does — DOM output, user interactions, accessible elements.

// Enzyme — testing internal state (implementation details)
const wrapper = shallow(<Counter />);
expect(wrapper.state('count')).toBe(0);
wrapper.find('button').simulate('click');
expect(wrapper.state('count')).toBe(1);
// Problem: This breaks if you refactor to useReducer or external state

// Testing Library — testing user behavior
render(<Counter />);
expect(screen.getByText('Count: 0')).toBeInTheDocument();
userEvent.click(screen.getByRole('button', { name: /increment/i }));
expect(screen.getByText('Count: 1')).toBeInTheDocument();
// This still works if you change state management internally

The Testing Library test is more resilient to refactoring because it doesn't know or care about implementation details.

---

React 18 Compatibility

// Enzyme with React 18 — problematic
// The official @wojtekmaj/enzyme-adapter-react-18 community adapter exists
// but is not officially maintained by Enzyme team

// enzyme.config.js (unofficial adapter)
import Enzyme from 'enzyme';
import Adapter from '@wojtekmaj/enzyme-adapter-react-18';
Enzyme.configure({ adapter: new Adapter() });

// Many tests still break due to React 18 concurrent mode changes
// act() warnings are common and difficult to suppress

// Testing Library with React 18 — fully supported
import { render, screen } from '@testing-library/react';
import userEvent from '@testing-library/user-event';

// @testing-library/react v14+ handles React 18 concurrent features
// No configuration needed — it wraps renders in act() automatically

---

Component Testing Examples

// Enzyme — shallow rendering (tests component in isolation)
import { shallow, mount } from 'enzyme';

describe('UserCard', () => {
  it('renders user name', () => {
    const wrapper = shallow(<UserCard user={{ name: 'Alice', role: 'Admin' }} />);
    expect(wrapper.find('.user-name').text()).toBe('Alice');
    expect(wrapper.find('.role-badge').text()).toBe('Admin');
  });

  it('calls onEdit when edit button clicked', () => {
    const onEdit = jest.fn();
    const wrapper = mount(<UserCard user={{ name: 'Alice' }} onEdit={onEdit} />);
    wrapper.find('[data-testid="edit-button"]').simulate('click');
    expect(onEdit).toHaveBeenCalledWith({ name: 'Alice' });
  });
});

// Testing Library — user-centric testing
import { render, screen } from '@testing-library/react';
import userEvent from '@testing-library/user-event';

describe('UserCard', () => {
  it('renders user name and role', () => {
    render(<UserCard user={{ name: 'Alice', role: 'Admin' }} />);
    expect(screen.getByText('Alice')).toBeInTheDocument();
    expect(screen.getByText('Admin')).toBeInTheDocument();
  });

  it('calls onEdit when edit button clicked', async () => {
    const onEdit = jest.fn();
    render(<UserCard user={{ name: 'Alice' }} onEdit={onEdit} />);
    await userEvent.click(screen.getByRole('button', { name: /edit/i }));
    expect(onEdit).toHaveBeenCalledWith({ name: 'Alice' });
  });
});

---

Querying Elements

// Enzyme — CSS selector and component-based queries
wrapper.find('.submit-button');
wrapper.find('button');
wrapper.find(SubmitButton); // Find by component type
wrapper.find({ 'data-testid': 'submit' });
wrapper.find('input[type="email"]');

// Testing Library — accessibility-first queries
// Priority order (best to least accessible):
screen.getByRole('button', { name: /submit/i }); // BEST — by ARIA role
screen.getByLabelText('Email');                   // Form elements
screen.getByPlaceholderText('Enter email...');    // Inputs
screen.getByText('Submit');                       // By text content
screen.getByDisplayValue('existing@email.com');   // Current form values
screen.getByAltText('User avatar');               // Images
screen.getByTitle('Close dialog');                // Title attribute
screen.getByTestId('submit-button');              // LAST RESORT — data-testid

// Testing queries also catch accessibility issues
// If getByRole fails, your component might have an accessibility problem

The Testing Library query priority is intentional — it encourages writing accessible components.

---

Async Testing

// Enzyme — async testing is verbose
it('loads user data', done => {
  const wrapper = mount(<UserProfile userId="123" />);
  setImmediate(() => {
    wrapper.update();
    expect(wrapper.find('.user-name').text()).toBe('Alice');
    done();
  });
});

// Or with async/await + manual wrapper.update()
it('loads user data', async () => {
  const wrapper = mount(<UserProfile userId="123" />);
  await act(async () => {
    await Promise.resolve();
    wrapper.update();
  });
  expect(wrapper.find('.user-name').text()).toBe('Alice');
});

// Testing Library — async testing is ergonomic
it('loads user data', async () => {
  render(<UserProfile userId="123" />);
  // findBy* queries wait up to 1000ms for element to appear
  const name = await screen.findByText('Alice');
  expect(name).toBeInTheDocument();
});

// waitFor — wait for condition to be true
it('shows error on failed load', async () => {
  server.use(rest.get('/api/user/:id', (req, res, ctx) => res(ctx.status(500))));
  render(<UserProfile userId="123" />);
  await waitFor(() => {
    expect(screen.getByRole('alert')).toBeInTheDocument();
  });
});

---

Migration Path

For large Enzyme codebases, incremental migration is feasible:

// Step 1: Install Testing Library alongside Enzyme
// npm install --save-dev @testing-library/react @testing-library/user-event

// Step 2: Start writing new tests with Testing Library
// Old Enzyme tests still run

// Step 3: Migrate test by test during normal maintenance
// When a component changes, migrate its Enzyme test to Testing Library

// Step 4: Remove Enzyme when all tests migrated
// @testing-library/jest-dom provides the extra matchers:
import '@testing-library/jest-dom';
// Enables: toBeInTheDocument, toBeVisible, toHaveValue, etc.

The migration isn't urgent if your Enzyme tests pass, but React 18+ forces the issue for new features.

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When to Choose

Choose Testing Library when:

• Starting any new React project (always)
• Using React 18 (Enzyme's adapter is unofficial)
• You value tests that survive refactoring
• Your team cares about accessibility testing
• Using Vue, Angular, or Svelte (Testing Library has adapters for all)

Keep Enzyme when:

• Large legacy codebase on React 16/17 with thousands of Enzyme tests
• Migration cost isn't justified by business value right now
• Using shallow rendering to test component trees (Testing Library doesn't support shallow)

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Compare Testing Library and Enzyme package health on PkgPulse.