// Basic comparison
assertThat(actual).isEqualTo(expected);

// Ignore repeated field order
assertThat(actual).ignoringRepeatedFieldOrder().isEqualTo(expected);

// Exclude specific fields
assertThat(actual).ignoringFields("timestamp").isEqualTo(expected);

// Partial comparison (only expected fields)
assertThat(actual).comparingExpectedFieldsOnly().isEqualTo(expected);

// Field presence checks
assertThat(actual).hasField("name");
assertThat(actual).doesNotHaveField("deletedAt");

if (field.isRepeated()) {
  // Use getField() instead of hasField()
  actualValue = actual.getField(field);
  expectedValue = expected.getField(field);
  
  // Treat empty lists as null
  List<Object> actualList = (List<Object>) actualValue;
  if (actualList.isEmpty()) actualValue = null;
}

import static org.assertj.protobuf.api.Assertions.assertThat;

@Test
void should_compare_protobuf_messages() {
  // GIVEN
  UserProto expected = UserProto.newBuilder()
      .setName("John")
      .setAge(30)
      .build();
  
  UserProto actual = userService.getUser(userId);
  
  // WHEN/THEN
  assertThat(actual).isEqualTo(expected);
}

@Test
void should_ignore_timestamp_and_repeated_order() {
  // GIVEN
  OrderProto expected = OrderProto.newBuilder()
      .setOrderId("ORD-123")
      .addItems("ITEM-1")
      .addItems("ITEM-2")
      .build();
  
  OrderProto actual = orderService.getOrder("ORD-123");
  
  // WHEN/THEN
  assertThat(actual)
      .ignoringFields("createdAt", "updatedAt")
      .ignoringRepeatedFieldOrder()
      .isEqualTo(expected);
}