How to Test SVG — Unit Tests, Visual Regression, and Accessibility
Test SVG components and graphics — Jest unit tests, visual regression with Percy or Chromatic, and accessibility testing with axe-core for SVG best practices.
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Unit Testing SVG Components with Jest
Test SVG React components with Jest and React Testing Library. Verify that SVG components render the correct attributes, respond to props, and render accessibility attributes (aria-label, role). Use `screen.getByRole('img')` to find SVG elements by their implicit ARIA role.
- `render(<Icon color='red' />)` and assert `expect(svg).toHaveAttribute('fill', 'red')`
- Accessibility: `expect(svg).toHaveAttribute('aria-label', 'Close icon')`
- Snapshot: `expect(container.firstChild).toMatchSnapshot()` for structure regression
Visual Regression Testing for SVG
Visual regression tools (Percy, Chromatic, Playwright visual) capture SVG screenshots and compare against a baseline. SVG visual regression catches rendering changes invisible to unit tests — anti-aliasing differences, color shifts, and layout changes in complex SVG illustrations.
- Percy: `percySnapshot(page, 'SVG Illustration')` in Playwright/Cypress tests
- Chromatic: Storybook integration auto-captures SVG component story screenshots
- Playwright: `expect(page).toHaveScreenshot('icon.png')` for local visual testing
Frequently Asked Questions
How do I test SVG accessibility with automated tools?
Run axe-core on pages with SVG: `const results = await axe.run(document)`. Common SVG accessibility violations: missing `role='img'` on non-decorative SVG, missing `aria-label` or `<title>` for screen readers, and decorative SVG without `aria-hidden='true'`. axe-core detects and reports these.
How do I mock SVG imports in Jest?
In Jest config (jest.config.js): `moduleNameMapper: { '\.svg$': '<rootDir>/__mocks__/fileMock.js' }`. The mock file exports a component: `module.exports = () => '<svg data-testid="icon" />'`. This prevents Jest from trying to parse SVG XML and lets tests focus on component behavior.
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