chore: add temporary confirmation test for compliance_suite payload serialization

Author: diegomarquezp

java-showcase/gapic-showcase/src/test/java/com/google/showcase/v1beta1/it/ITHttpAnnotation.java

@@ -42,6 +42,7 @@
 import java.util.stream.Stream;
 import org.junit.jupiter.api.AfterAll;
 import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.Arguments;
 import org.junit.jupiter.params.provider.MethodSource;
@@ -115,6 +116,19 @@ static void destroyClients() throws InterruptedException {
         TestClientInitializer.AWAIT_TERMINATION_SECONDS, TimeUnit.SECONDS);
   }
 
+  @Test
+  void verifyByteSizeOfExtremePayload() {
+    RepeatRequest request = complianceSuite.getGroup(0).getRequests(3);
+    assertThat(request.getName()).isEqualTo("Extreme values");
+    int fStringCount = request.getInfo().getFString().length();
+    assertThat(fStringCount).isEqualTo(69);
+    System.out.println(request.getInfo().getFString());
+    int fStringBytes = request.getInfo().getFStringBytes().size();
+    assertThat(fStringBytes).isEqualTo(77);
+    int requestBytes = request.getSerializedSize();
+    assertThat(requestBytes).isEqualTo(222);
+  }
+
   // Verify that the input's info is the same as the response's info
   // This ensures that the entire group's behavior over HttpJson
   // works as intended