feature: add helper for stub plugin into tests

lib/treasury/spec_helpers.rb

@@ -0,0 +1,62 @@
+module Treasury
+  module CoreDenormalizationFake
+    ROOT_REDIS_KEY = 'denormalization'.freeze
+
+    module Processors
+      module Company
+        class Base
+        end
+      end
+
+      module User
+        class Base
+          def interesting_event?
+            true
+          end
+        end
+      end
+    end
+
+    module Fields
+      module User
+        class Base
+        end
+
+        class Companies
+        end
+      end
+
+      module Company
+        class Base
+        end
+
+        class Translator
+        end
+      end
+
+      class Base
+      end
+    end
+  end
+
+  # Treasury::SpecHelpers provides method for stub plugin denormalization classes
+  # with fake class.
+  #
+  # Example:
+  # spec_helper.rb
+  #
+  # require 'treasury/spec_helpers'
+  #
+  # Treasury::SpecHelpers.stub_core_denormalization
+  #
+  # RSpec.configure do |config|
+  #   ...
+  # end
+  module SpecHelpers
+    def stub_core_denormalization
+      Object.const_set('CoreDenormalization', CoreDenormalizationFake)
+    end
+
+    module_function :stub_core_denormalization
+  end
+end