feat(presentation_group_keys): Fix validation of presentation group keys duplicated values

app/services/charges/validators/base_service.rb

@@ -59,6 +59,7 @@ def validate_presentation_group_keys
         raw_keys = properties["presentation_group_keys"]
         return if raw_keys.blank?
 
+        values = []
         valid_presentation_group_keys = raw_keys.is_a?(Array) && raw_keys.all? do |key|
           next false unless key.is_a?(Hash)
 
@@ -80,6 +81,8 @@ def validate_presentation_group_keys
             end
           end
 
+          values << key[:value] if value_valid
+
           keys_valid && value_key_present && value_valid && options_key_valid
         end
 
@@ -93,6 +96,10 @@ def validate_presentation_group_keys
         if raw_keys.size > 2
           add_error(field: "presentation_group_keys", error_code: "too_many_keys")
         end
+
+        if values.size != values.uniq.size
+          add_error(field: "presentation_group_keys", error_code: "value_is_duplicated")
+        end
       end
     end
   end

spec/support/shared_examples/charges/presentation_group_keys_validation.rb

@@ -30,6 +30,17 @@
     end
   end
 
+  context "when presentation_group_keys has duplicated values" do
+    let(:presentation_group_keys) { [{"value" => "country"}, {"value" => "country"}] }
+
+    it "is invalid" do
+      expect(validation_service).not_to be_valid
+      expect(validation_service.result.error).to be_a(BaseService::ValidationFailure)
+      expect(validation_service.result.error.messages.keys).to include(:presentation_group_keys)
+      expect(validation_service.result.error.messages[:presentation_group_keys]).to include("value_is_duplicated")
+    end
+  end
+
   context "when presentation_group_keys has options" do
     let(:presentation_group_keys) do
       [