fragmentComponentTest.js

// @flow

import * as React from 'react';
import { mount } from 'enzyme';
import { QueryRenderer, graphql } from '@adeira/relay';
import { createMockEnvironment, MockPayloadGenerator } from 'relay-test-utils';

describe('Component', () => {
  it('Shows something', () => {
    const environment = createMockEnvironment();
    const TestComponent = () => (
      <QueryRenderer
        environment={environment}
        query={graphql`
          query TestQuery @relay_test_operation {
            someQuery {
              ...YourFragment
            }
          }
        `}
        variables={{}}
        onResponse={() => {
          /* Render your fragment container */
        }}
      />
    );
    const wrapper = mount(<TestComponent />);
    environment.mock.resolveMostRecentOperation(operation =>
      MockPayloadGenerator.generate(operation),
    );
    wrapper.update();

    // Test your stuff
  });
});