Add test for map field reflection

test-crates/protobuf-codegen-protoc-test/src/common/v2/test_reflect_map.rs

@@ -0,0 +1,31 @@
+use protobuf::reflect::ReflectValueBox;
+use protobuf::MessageFull;
+
+use super::test_reflect_map_pb::TestMap;
+
+#[test]
+fn test_map() {
+    let mut message = TestMap::new();
+    message
+        .map_string_string
+        .insert("foo".to_owned(), "bar".to_owned());
+    message.map_int32_bool.insert(1, true);
+
+    let map_string_string = TestMap::descriptor()
+        .field_by_name("map_string_string")
+        .unwrap();
+    let map_int32_bool = TestMap::descriptor()
+        .field_by_name("map_int32_bool")
+        .unwrap();
+
+    let mut reflect_message = TestMap::descriptor().new_instance();
+    map_string_string.mut_map(&mut *reflect_message).insert(
+        ReflectValueBox::String("foo".to_owned()),
+        ReflectValueBox::String("bar".to_owned()),
+    );
+    map_int32_bool
+        .mut_map(&mut *reflect_message)
+        .insert(ReflectValueBox::I32(1), ReflectValueBox::Bool(true));
+
+    assert!(TestMap::descriptor().eq(&message, &*reflect_message));
+}

test-crates/protobuf-codegen-protoc-test/src/common/v2/test_reflect_map_pb.proto

@@ -0,0 +1,9 @@
+syntax = "proto2";
+
+import "rustproto.proto";
+option (rustproto.generate_accessors_all) = true;
+
+message TestMap {
+    map<string, string> map_string_string = 1;
+    map<int32, bool> map_int32_bool = 2;
+}