@Test
  public void assertThatReadinessProbeWorks() throws Exception {
    try (final Response resp = client.newCall(buildGetRequest("/readiness")).execute()) {
      assertThat(resp.code()).isEqualTo(200);
    }
  }
Tests that empty batch requests are treated as invalid requests as per
http://www.jsonrpc.org/specification#batch.
ethereum/api/src/test/java/org/hyperledger/besu/ethereum/api/jsonrpc/JsonRpcHttpServiceTest.java