Make serializers serializable, step 1.

test/serializers/serialization_test.rb

@@ -0,0 +1,55 @@
+module ActiveModel
+  class Serializer
+    class SerializationTest < ActiveSupport::TestCase
+      class Blog < ActiveModelSerializers::Model
+        attr_accessor :id, :name, :authors
+      end
+      class Author < ActiveModelSerializers::Model
+        attr_accessor :id, :name
+      end
+      class BlogSerializer < ActiveModel::Serializer
+        attributes :id
+        attribute :name, key: :title
+
+        has_many :authors
+      end
+      class AuthorSerializer < ActiveModel::Serializer
+        attributes :id, :name
+      end
+
+      setup do
+        @authors = [Author.new(id: 1, name: 'Blog Author')]
+        @blog = Blog.new(id: 2, name: 'The Blog', authors: @authors)
+        @serializer_instance = BlogSerializer.new(@blog)
+        @serializable = ActiveModel::SerializableResource.new(@blog, serializer: BlogSerializer, adapter: :attributes)
+        @expected_hash = { id: 2, title: 'The Blog', authors: [{ id: 1, name: 'Blog Author' }] }
+        @expected_json = '{"id":2,"title":"The Blog","authors":[{"id":1,"name":"Blog Author"}]}'
+      end
+
+      test '#serializable_hash is the same as generated by the attributes adapter' do
+        assert_equal @serializable.serializable_hash, @serializer_instance.serializable_hash
+        assert_equal @expected_hash, @serializer_instance.serializable_hash
+      end
+
+      test '#as_json is the same as generated by the attributes adapter' do
+        assert_equal @serializable.as_json, @serializer_instance.as_json
+        assert_equal @expected_hash, @serializer_instance.as_json
+      end
+
+      test '#to_json is the same as generated by the attributes adapter' do
+        assert_equal @serializable.to_json, @serializer_instance.to_json
+        assert_equal @expected_json, @serializer_instance.to_json
+      end
+
+      test '#to_h is an alias for #serializable_hash' do
+        assert_equal @serializable.serializable_hash, @serializer_instance.to_h
+        assert_equal @expected_hash, @serializer_instance.to_h
+      end
+
+      test '#to_hash is an alias for #serializable_hash' do
+        assert_equal @serializable.serializable_hash, @serializer_instance.to_hash
+        assert_equal @expected_hash, @serializer_instance.to_hash
+      end
+    end
+  end
+end