message: Add minimal transformExchange test
diff: @@ -28,6 +28,18 @@ describe('Client', () => {
  expect(client.url).toMatch('test');
  });
  + it('should apply transformExchange to the exchange', () => {
  + const client = new Client({
  + transformExchange: x => {
  + (x as any).test = true;
  + return x;
  + },
  + url: 'test',
  + });
  +
  + expect((client.exchange as any).test).toBe(true);
  + });
  +
  it('should set fetchOptions', () => {
  const client = new Client({
  fetchOptions: {
  