feat(has_j_send_result): expose result?

lib/convenient_service/service/plugins/has_j_send_result.rb

@@ -6,3 +6,42 @@
 require_relative "has_j_send_result/commands"
 require_relative "has_j_send_result/entities"
 require_relative "has_j_send_result/exceptions"
+
+module ConvenientService
+  module Service
+    module Plugins
+      module HasJSendResult
+        class << self
+          ##
+          # Checks whether an object is a result instance.
+          #
+          # @api public
+          #
+          # @param result [Object] Can be any type.
+          # @return [Boolean]
+          #
+          # @example Simple usage.
+          #   class Service
+          #     include ConvenientService::Standard::Config
+          #
+          #     def result
+          #       success
+          #     end
+          #   end
+          #
+          #   result = Service.result
+          #
+          #   ConvenientService::Plugins::Service::HasJSendResult.result?(result)
+          #   # => true
+          #
+          #   ConvenientService::Plugins::Service::HasJSendResult.result?(42)
+          #   # => false
+          #
+          def result?(result)
+            Commands::IsResult[result: result]
+          end
+        end
+      end
+    end
+  end
+end

spec/lib/convenient_service/service/plugins/has_j_send_result_spec.rb

@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+require "spec_helper"
+
+require "convenient_service"
+
+# rubocop:disable RSpec/NestedGroups, RSpec/MultipleMemoizedHelpers
+RSpec.describe ConvenientService::Service::Plugins::HasJSendResult do
+  include ConvenientService::RSpec::Matchers::DelegateTo
+
+  example_group "class methods" do
+    describe ".result?" do
+      let(:service) do
+        Class.new do
+          include ConvenientService::Service::Configs::Minimal
+        end
+      end
+
+      let(:result) { service.success }
+
+      specify do
+        expect { described_class.result?(result) }
+          .to delegate_to(ConvenientService::Service::Plugins::HasJSendResult::Commands::IsResult, :call)
+          .with_arguments(result: result)
+          .and_return_its_value
+      end
+    end
+  end
+end
+# rubocop:enable RSpec/NestedGroups, RSpec/MultipleMemoizedHelpers