@Test
  public void testFindCustomerByEmail() {
    Customer c1 = new Customer();
    String email = "*****@*****.**";
    c1.setEmail(email);
    doReturn(c1).when(customerDaoMock).findByEmail(email);

    Customer customer = service.findCustomerByEmail(email);
    verify(customerDaoMock).findByEmail(email);
    verifyNoMoreInteractions(customerDaoMock);
    Assert.assertEquals(email, customer.getEmail());
  }