test/protos/mixins.proto

syntax = "proto2";

import "dart_options.proto";

option (dart_options.imported_mixins) = {
  mixins: [{
    name: "Mixin1"
    import_from: "package:protoc_plugin/testing/mixins.dart"
  },
  {
   name: "Mixin2"
   import_from: "package:protoc_plugin/testing/mixins.dart"
  },
  {
    name: "Mixin3"
    import_from: "package:protoc_plugin/testing/mixins.dart"
    parent: "Mixin1"
  }];
};

option (dart_options.default_mixin) = "Mixin1";

message NoMixinPB {
  option (dart_options.mixin) = "";
}

message Mixin1PB {
  optional string interface_string = 1;
}

message Mixin2PB {
  option (dart_options.mixin) = "Mixin2";

  optional string overridden_has_method = 3;
}

message Mixin3PB {
  option (dart_options.mixin) = "Mixin3";

  optional string interface_string = 1;
}