Test Java Sends Without the Network

StubTransport transport = new StubTransport().enqueueResponse(
        202,
        "{\"id\":\"msg_1\",\"type\":\"order.created\",\"customerId\":\"customer-123\","
                + "\"timestamp\":\"1970-01-01T00:00:00.000Z\"}");
ClientOptions options = ClientOptions.builder()
        .apiKey("test-key")
        .transport(transport)
        .maxAttempts(1)
        .build();
Order order = Order.builder().id("order-123").build();
try (RepostClient repost = RepostClient.create(options)) {
    SendResult result = repost.webhooks().order().created("customer-123", order);
    assertTrue("msg_1".equals(result.getId()));
}
String sent = new String(transport.getRequests().get(0).getBodyBytes(), StandardCharsets.UTF_8);
assertTrue(sent.contains("\"id\":\"order-123\""));