Implement has_one's and serialize_ids

test/unit/active_model/serializer/has_one_test.rb

@@ -0,0 +1,35 @@
+require 'test_helper'
+require 'active_model/serializer'
+
+module ActiveModel
+  class Serializer
+    class HasOneTest < ActiveModel::TestCase
+      def setup
+        @model = ::Model.new({ :attr1 => 'value1', :attr2 => 'value2', :attr3 => 'value3' })
+        @model_serializer = AnotherSerializer.new(@model)
+      end
+
+      def test_associations_definition
+        associations = @model_serializer.class._associations
+
+        assert_equal 1, associations.length
+        assert_kind_of Association::HasOne, associations[0]
+        assert_equal 'model', associations[0].name
+      end
+
+      def test_associations_serialization_using_serializable_hash
+        @model_serializer.class._associations[0].embed = :ids
+        assert_equal({
+          'attr2' => 'value2', 'attr3' => 'value3', 'model_id' => @model.model.object_id
+        }, @model_serializer.serializable_hash)
+      end
+
+      def test_associations_serialization_using_as_json
+        @model_serializer.class._associations[0].embed = :ids
+        assert_equal({
+          'attr2' => 'value2', 'attr3' => 'value3', 'model_id' => @model.model.object_id
+        }, @model_serializer.as_json)
+      end
+    end
+  end
+end