Fix flappy tests

Paginator changes in other tests result in flappy tests. Explicitly
 setting to the one we need.

Author: lgebhardt

test/fixtures/active_record.rb

@@ -1465,6 +1465,8 @@ class BookResource < JSONAPI::Resource
       attribute "title"
       attributes :isbn, :banned
 
+      paginator :offset
+
       has_many "authors"
 
       has_many "book_comments", relation_name: -> (options = {}) {
@@ -1523,6 +1525,8 @@ class BookCommentResource < JSONAPI::Resource
       has_one :book
       has_one :author, class_name: 'Person'
 
+      paginator :offset
+
       filters :book
       filter :approved, apply: ->(records, value, options) {
         context = options[:context]

test/integration/requests/request_test.rb

@@ -609,6 +609,7 @@ def test_query_count_related_resources
     # * Fetch specified book record
     # * Fetch book comment records associated with specified book
     # * Select count of book comment records for pagination
+    Api::V2::BookCommentResource.paginator :offset
     assert_query_count 3 do
       get '/api/v2/books/1/book_comments?page[limit]=20'
     end
@@ -621,6 +622,8 @@ def test_query_count_related_resources_with_includes
     # * Fetch book comment records associated with specified book
     # * Fetch all author records the book comments to be returned
     # * Select count of book comment records for pagination
+    Api::V2::BookCommentResource.paginator :offset
+
     assert_query_count 4 do
       get '/api/v2/books/1/book_comments?page[limit]=20&include=author'
     end