feat: add test case

Author: khj68

grpc/src/test/java/com/linecorp/armeria/internal/server/grpc/GrpcDocServicePluginTest.java

@@ -451,7 +451,11 @@ void httpEndpoint() {
                 FieldInfo.builder("message_id", TypeSignature.ofBase(JavaType.STRING.name()))
                          .location(FieldLocation.PATH).requirement(FieldRequirement.REQUIRED).build(),
                 FieldInfo.builder("text", TypeSignature.ofBase(JavaType.STRING.name()))
-                         .location(FieldLocation.BODY).requirement(FieldRequirement.REQUIRED).build()));
+                         .location(FieldLocation.BODY).requirement(FieldRequirement.REQUIRED).build(),
+                FieldInfo.builder("required_text", TypeSignature.ofBase(JavaType.STRING.name()))
+                        .location(FieldLocation.BODY).requirement(FieldRequirement.REQUIRED).build(),
+                FieldInfo.builder("optional_text", TypeSignature.ofBase(JavaType.STRING.name()))
+                        .location(FieldLocation.BODY).requirement(FieldRequirement.OPTIONAL).build()));
         assertThat(updateMessageV2.useParameterAsRoot()).isFalse();
     }
 

grpc/src/test/proto/testing/grpc/transcoding.proto

@@ -21,6 +21,7 @@ package armeria.grpc.testing;
 option java_package = "testing.grpc";
 
 import "google/api/annotations.proto";
+import "google/api/field_behavior.proto";
 import "google/protobuf/timestamp.proto";
 import "google/protobuf/duration.proto";
 import "google/protobuf/wrappers.proto";
@@ -292,6 +293,8 @@ message UpdateMessageRequestV1 {
 
 message Message {
   string text = 1; // The resource content.
+  google.protobuf.StringValue required_text = 2 [(google.api.field_behavior) = REQUIRED];
+  google.protobuf.StringValue optional_text = 3;
 }
 
 enum MessageType {