@Test
  public void shouldReceiveMessages() {
    String body = "A message";
    when(sqsClient.receiveMessage(any(ReceiveMessageRequest.class)).getMessages())
        .thenReturn(Arrays.asList(new Message().withBody(body)));

    List<String> messages = provider.receive();
    assertThat(messages.size(), is(1));
    assertThat(messages, hasItem(body));
  }