Refactor adapters to implement support for array serialization

test/adapter/json_api/collection_test.rb

@@ -0,0 +1,28 @@
+require 'test_helper'
+
+module ActiveModel
+  class Serializer
+    class Adapter
+      class JsonApi
+        class Collection < Minitest::Test
+          def setup
+            @first_post = Post.new(id: 1, title: 'Hello!!', body: 'Hello, world!!')
+            @second_post = Post.new(id: 2, title: 'New Post', body: 'Body')
+            @first_post.comments = []
+            @second_post.comments = []
+
+            @serializer = ArraySerializer.new([@first_post, @second_post])
+            @adapter = ActiveModel::Serializer::Adapter::JsonApi.new(@serializer)
+          end
+
+          def test_include_multiple_posts
+            assert_equal([
+                           {title: "Hello!!", body: "Hello, world!!", id: 1, links: {comments: []}},
+                           {title: "New Post", body: "Body", id: 2, links: {comments: []}}
+                         ], @adapter.serializable_hash[:posts])
+          end
+        end
+      end
+    end
+  end
+end