Set up GitHub actions CI (#2403)

* Set up GitHub actions CI
* Remove simplecov entirely for now
* Fix deprecations
* Relax dev deps
* Address Rails 6.0 blocking hosts
* Rails 6.1 content type changed to application/json; charset=utf-8
* Test a few more rubies and rails
* Stop testing grape. We should drop grape support

```
/home/runner/work/active_model_serializers/active_model_serializers/vendor/bundle/ruby/2.6.0/gems/grape-0.19.0/lib/grape/error_formatter.rb:16: warning: in `formatters': the last argument was passed as a single Hash
/home/runner/work/active_model_serializers/active_model_serializers/vendor/bundle/ruby/2.6.0/gems/grape-0.19.0/lib/grape/error_formatter.rb:21: warning: although a splat keyword arguments here
Run options: --seed 23470

..........................................................................................................................................................................................................................................................................................................................................................................................................................................E

ActiveModelSerializers::GrapeTest#test_render_helper_passes_through_options_correctly:
NoMethodError: undefined method `[]' for nil:NilClass

bin/rails test /home/runner/work/active_model_serializers/active_model_serializers/test/grape_test.rb:126

W, [2020-12-29T02:27:48.991413 #2790]  WARN -- : You are setting a key that conflicts with a built-in method Hashie::Mash#size defined in Hash. This can cause unexpected behavior when accessing the key as a property. You can still access the key via the #[] method.
W, [2020-12-29T02:27:48.991505 #2790]  WARN -- : You are setting a key that conflicts with a built-in method Hashie::Mash#size defined in Hash. This can cause unexpected behavior when accessing the key as a property. You can still access the key via the #[] method.
W, [2020-12-29T02:27:48.991581 #2790]  WARN -- : You are setting a key that conflicts with a built-in method Hashie::Mash#size defined in Hash. This can cause unexpected behavior when accessing the key as a property. You can still access the key via the #[] method.
W, [2020-12-29T02:27:48.991625 #2790]  WARN -- : You are setting a key that conflicts with a built-in method Hashie::Mash#size defined in Hash. This can cause unexpected behavior when accessing the key as a property. You can still access the key via the #[] method.
E

Error:
ActiveModelSerializers::GrapeTest#test_implicit_formatter_handles_collections:
NoMethodError: undefined method `[]' for nil:NilClass

bin/rails test /home/runner/work/active_model_serializers/active_model_serializers/test/grape_test.rb:185

...............................................................................................................................................

Finished in 2.052241s, 280.6688 runs/s, 473.6285 assertions/s.
576 runs, 972 assertions, 0 failures, 7 errors, 0 skips
rake aborted!
Command failed with status (1): [ruby -w -I"lib:lib:test" -r./test/test_helper.rb  -w -I"/home/runner/work/active_model_serializers/active_model_serializers/vendor/bundle/ruby/2.6.0/gems/rake-12.3.3/lib" "/home/runner/work/active_model_serializers/active_model_serializers/vendor/bundle/ruby/2.6.0/gems/rake-12.3.3/lib/rake/rake_test_loader.rb" "test/action_controller/adapter_selector_test.rb" "test/action_controller/explicit_serializer_test.rb" "test/action_controller/json/include_test.rb" "test/action_controller/json_api/deserialization_test.rb" "test/action_controller/json_api/errors_test.rb" "test/action_controller/json_api/fields_test.rb" "test/action_controller/json_api/linked_test.rb" "test/action_controller/json_api/pagination_test.rb" "test/action_controller/json_api/transform_test.rb" "test/action_controller/lookup_proc_test.rb" "test/action_controller/namespace_lookup_test.rb" "test/action_controller/serialization_scope_name_test.rb" "test/action_controller/serialization_test.rb" "test/active_model_serializers/adapter_for_test.rb" "test/active_model_serializers/json_pointer_test.rb" "test/active_model_serializers/logging_test.rb" "test/active_model_serializers/model_test.rb" "test/active_model_serializers/test/schema_test.rb" "test/active_model_serializers/test/serializer_test.rb" "test/active_record_test.rb" "test/adapter/attributes_test.rb" "test/adapter/deprecation_test.rb" "test/adapter/json/belongs_to_test.rb" "test/adapter/json/collection_test.rb" "test/adapter/json/fields_test.rb" "test/adapter/json/has_many_test.rb" "test/adapter/json/transform_test.rb" "test/adapter/json_api/belongs_to_test.rb" "test/adapter/json_api/collection_test.rb" "test/adapter/json_api/errors_test.rb" "test/adapter/json_api/fields_test.rb" "test/adapter/json_api/has_many_explicit_serializer_test.rb" "test/adapter/json_api/has_many_test.rb" "test/adapter/json_api/has_one_test.rb" "test/adapter/json_api/include_data_if_sideloaded_test.rb" "test/adapter/json_api/json_api_test.rb" "test/adapter/json_api/linked_test.rb" "test/adapter/json_api/links_test.rb" "test/adapter/json_api/pagination_links_test.rb" "test/adapter/json_api/parse_test.rb" "test/adapter/json_api/relationship_test.rb" "test/adapter/json_api/resource_meta_test.rb" "test/adapter/json_api/toplevel_jsonapi_test.rb" "test/adapter/json_api/transform_test.rb" "test/adapter/json_api/type_test.rb" "test/adapter/json_test.rb" "test/adapter/null_test.rb" "test/adapter/polymorphic_test.rb" "test/adapter_test.rb" "test/array_serializer_test.rb" "test/cache_test.rb" "test/collection_serializer_test.rb" "test/generators/scaffold_controller_generator_test.rb" "test/generators/serializer_generator_test.rb" "test/grape_test.rb" "test/lint_test.rb" "test/logger_test.rb" "test/poro_test.rb" "test/serializable_resource_test.rb" "test/serializers/association_macros_test.rb" "test/serializers/associations_test.rb" "test/serializers/attribute_test.rb" "test/serializers/attributes_test.rb" "test/serializers/configuration_test.rb" "test/serializers/fieldset_test.rb" "test/serializers/meta_test.rb" "test/serializers/options_test.rb" "test/serializers/read_attribute_for_serialization_test.rb" "test/serializers/reflection_test.rb" "test/serializers/root_test.rb" "test/serializers/serialization_test.rb" "test/serializers/serializer_for_test.rb" "test/serializers/serializer_for_with_namespace_test.rb" ]
/home/runner/work/active_model_serializers/active_model_serializers/vendor/bundle/ruby/2.6.0/gems/rake-12.3.3/exe/rake:27:in `<top (required)>'
/opt/hostedtoolcache/Ruby/2.6.6/x64/bin/bundle:23:in `load'
/opt/hostedtoolcache/Ruby/2.6.6/x64/bin/bundle:23:in `<main>'
Tasks: TOP => default => test
(See full trace by running task with --trace)
Error: Process completed with exit code 1.
```

.github/workflows/ci.yml

@@ -0,0 +1,69 @@
+---
+
+name: CI
+
+on:
+  - "push"
+
+jobs:
+  test:
+    name: "Testing"
+    runs-on: ubuntu-18.04
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          # Recent Rubies and Rails
+          - ruby-version: '2.6'
+            rails-version: '6.1'
+          - ruby-version: '2.6'
+            rails-version: '6.0'
+          - ruby-version: '2.7'
+            rails-version: '6.0'
+          - ruby-version: '2.6'
+            rails-version: '5.2'
+          # Old Rubies and Rails
+          - ruby-version: '2.5'
+            rails-version: '5.1'
+            bundler: '1'
+          - ruby-version: '2.4'
+            rails-version: '5.0'
+            bundler: '1'
+          - ruby-version: '2.4'
+            rails-version: '4.2'
+            bundler: '1'
+          # Failing with a stack trace in active support
+          # - ruby-version: '2.4'
+          #   rails-version: '4.1'
+          #   bundler: '1'
+
+    continue-on-error: "${{ endsWith(matrix.ruby-version, 'head') }}"
+
+    env:
+      CI: "1"
+
+    steps:
+      - name:                     "Checkout Code"
+        uses:                     "actions/checkout@v2"
+        timeout-minutes:          5
+        with:
+          fetch-depth:            0
+
+      - name: Install required libs
+        run: |
+          sudo apt-get -yqq install libsqlite3-dev
+
+      - name: "Build Ruby"
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version:   "${{ matrix.ruby-version }}"
+          bundler:        "${{ matrix.bundler || 2 }}"
+          bundler-cache:  true
+        env:
+          RAILS_VERSION: ${{ matrix.rails-version }}
+
+      - name: "Run tests"
+        run: |
+          bundle exec rake
+        env:
+          RAILS_VERSION: ${{ matrix.rails-version }}

.simplecov

@@ -1,110 +0,0 @@
-# https://github.com/colszowka/simplecov#using-simplecov-for-centralized-config
-# see https://github.com/colszowka/simplecov/blob/master/lib/simplecov/defaults.rb
-# vim: set ft=ruby
-
-## DEFINE VARIABLES
-@minimum_coverage = ENV.fetch('COVERAGE_MINIMUM') {
-  case (defined?(RUBY_ENGINE) && RUBY_ENGINE) || "ruby"
-  when 'jruby', 'rbx'
-    96.0
-  else
-    98.1
-  end
-}.to_f.round(2)
-# rubocop:disable Style/DoubleNegation
-ENV['FULL_BUILD'] ||= ENV['CI']
-@running_ci       = !!(ENV['FULL_BUILD'] =~ /\Atrue\z/i)
-@generate_report  = @running_ci || !!(ENV['COVERAGE'] =~ /\Atrue\z/i)
-@output = STDOUT
-# rubocop:enable Style/DoubleNegation
-
-## CONFIGURE SIMPLECOV
-
-SimpleCov.profiles.define 'app' do
-  coverage_dir 'coverage'
-  load_profile 'test_frameworks'
-
-  add_group 'Libraries', 'lib'
-
-  add_group 'Long files' do |src_file|
-    src_file.lines.count > 100
-  end
-  class MaxLinesFilter < SimpleCov::Filter
-    def matches?(source_file)
-      source_file.lines.count < filter_argument
-    end
-  end
-  add_group 'Short files', MaxLinesFilter.new(5)
-
-  # Exclude these paths from analysis
-  add_filter '/config/'
-  add_filter '/db/'
-  add_filter 'tasks'
-  add_filter '/.bundle/'
-end
-
-## START TRACKING COVERAGE (before activating SimpleCov)
-require 'coverage'
-Coverage.start
-
-## ADD SOME CUSTOM REPORTING AT EXIT
-SimpleCov.at_exit do
-  next if $! and not ($!.kind_of? SystemExit and $!.success?)
-
-  header = "#{'*' * 20} SimpleCov Results #{'*' * 20}"
-  results = SimpleCov.result.format!.join("\n")
-  exit_message = <<-EOF
-
-#{header}
-{{RESULTS}}
-{{FAILURE_MESSAGE}}
-
-#{'*' * header.size}
-  EOF
-  percent = Float(SimpleCov.result.covered_percent)
-  if percent < @minimum_coverage
-    failure_message = <<-EOF
-Spec coverage was not high enough: #{percent.round(2)}% is < #{@minimum_coverage}%
-    EOF
-    exit_message.sub!('{{RESULTS}}', results).sub!('{{FAILURE_MESSAGE}}', failure_message)
-    @output.puts exit_message
-    abort(failure_message) if @generate_report
-  elsif @running_ci
-    exit_message.sub!('{{RESULTS}}', results).sub!('{{FAILURE_MESSAGE}}', <<-EOF)
-Nice job! Spec coverage (#{percent.round(2)}%) is still at or above #{@minimum_coverage}%
-    EOF
-    @output.puts exit_message
-  end
-end
-
-## CAPTURE CONFIG IN CLOSURE 'AppCoverage.start'
-## to defer running until test/test_helper.rb is loaded.
-# rubocop:disable Style/MultilineBlockChain
-AppCoverage = Class.new do
-  def initialize(&block)
-    @block = block
-  end
-
-  def start
-    @block.call
-  end
-end.new do
-  SimpleCov.start 'app'
-  if @generate_report
-    if @running_ci
-      require 'codeclimate-test-reporter'
-      @output.puts '[COVERAGE] Running with SimpleCov Simple Formatter and CodeClimate Test Reporter'
-      formatters = [
-        SimpleCov::Formatter::SimpleFormatter,
-        CodeClimate::TestReporter::Formatter
-      ]
-    else
-      @output.puts '[COVERAGE] Running with SimpleCov HTML Formatter'
-      formatters = [SimpleCov::Formatter::HTMLFormatter]
-    end
-  else
-    formatters = []
-  end
-  SimpleCov.formatters = formatters
-end
-# rubocop:enable Style/MultilineBlockChain

README.md

@@ -13,7 +13,6 @@
     <td>
       <a href="https://codeclimate.com/github/rails-api/active_model_serializers"><img src="https://codeclimate.com/github/rails-api/active_model_serializers/badges/gpa.svg" alt="Code Quality"></a>
       <a href="https://codebeat.co/projects/github-com-rails-api-active_model_serializers"><img src="https://codebeat.co/badges/a9ab35fa-8b5a-4680-9d4e-a81f9a55ebcd" alt="codebeat" ></a>
-      <a href="https://codeclimate.com/github/rails-api/active_model_serializers/coverage"><img src="https://codeclimate.com/github/rails-api/active_model_serializers/badges/coverage.svg" alt="Test Coverage"></a>
     </td>
   </tr>
   <tr>

Rakefile

@@ -5,10 +5,6 @@ begin
 rescue LoadError
   puts 'You must `gem install bundler` and `bundle install` to run rake tasks'
 end
-begin
-  require 'simplecov'
-rescue LoadError # rubocop:disable Lint/HandleExceptions
-end
 import('lib/tasks/rubocop.rake')
 
 Bundler::GemHelper.install_tasks
@@ -56,13 +52,20 @@ namespace :test do
     # https://github.com/rails/rails/blob/3d590add45/railties/lib/rails/generators/app_base.rb#L345-L363
     _bundle_command = Gem.bin_path('bundler', 'bundle')
     require 'bundler'
-    Bundler.with_clean_env do
+    with_clean_env = proc do
       isolated_test_files.all? do |test_file|
         command = "-w -I#{dir}/lib -I#{dir}/test #{Shellwords.shellescape(test_file)}"
         full_command = %("#{Gem.ruby}" #{command})
         system(full_command)
       end or fail 'Failures' # rubocop:disable Style/AndOr
     end
+    bundler_method =
+      if Bundler.method_defined?(:with_unbundled_env)
+        :with_unbundled_env
+      else
+        :with_clean_env
+      end
+    Bundler.public_send(bundler_method, &with_clean_env)
   end
 end
 

active_model_serializers.gemspec

@@ -55,9 +55,8 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'will_paginate', '~> 3.0', '>= 3.0.7'
 
   spec.add_development_dependency 'bundler'
-  spec.add_development_dependency 'simplecov', '>= 0.11'
   spec.add_development_dependency 'timecop', '~> 0.7'
-  spec.add_development_dependency 'grape', ['>= 0.13', '< 0.19.1']
+  spec.add_development_dependency 'grape', '>= 0.13'
   spec.add_development_dependency 'json_schema'
-  spec.add_development_dependency 'rake', ['>= 10.0', '< 13.0']
+  spec.add_development_dependency 'rake', '>= 10.0'
 end

docs/STYLE.md

@@ -18,8 +18,6 @@
 
 - [Improve code quality](https://codeclimate.com/github/rails-api/active_model_serializers/code?sort=smell_count&sort_direction=desc).
 
-- [Improve amount of code exercised by tests](https://codeclimate.com/github/rails-api/active_model_serializers/coverage?sort=covered_percent&sort_direction=asc).
-
 - [Fix RuboCop (Style) TODOS](https://github.com/rails-api/active_model_serializers/blob/master/.rubocop_todo.yml).
   - Delete and offsense, run `rake rubocop` (or possibly `rake rubocop:auto_correct`),
     and [submit a PR](CONTRIBUTING.md#submitting-a-pull-request-pr).

test/action_controller/explicit_serializer_test.rb

@@ -71,13 +71,13 @@ module ActionController
       def test_render_using_explicit_serializer
         get :render_using_explicit_serializer
 
-        assert_equal 'application/json', @response.content_type
+        assert_match(%r{\Aapplication/json}, @response.content_type)
         assert_equal '{"name":"Name 1"}', @response.body
       end
 
       def test_render_array_using_explicit_serializer
         get :render_array_using_explicit_serializer
-        assert_equal 'application/json', @response.content_type
+        assert_match(%r{\Aapplication/json}, @response.content_type)
 
         expected = [
           { 'name' => 'Name 1' },
@@ -89,7 +89,7 @@ module ActionController
 
       def test_render_array_using_implicit_serializer
         get :render_array_using_implicit_serializer
-        assert_equal 'application/json', @response.content_type
+        assert_match(%r{\Aapplication/json}, @response.content_type)
 
         expected = [
           { 'name' => 'Name 1' },

test/action_controller/serialization_test.rb

@@ -155,7 +155,7 @@ module ActionController
           description: 'Description 1'
         }
 
-        assert_equal 'application/json', @response.content_type
+        assert_match(%r{\Aapplication/json}, @response.content_type)
         assert_equal expected.to_json, @response.body
       end
 
@@ -174,7 +174,7 @@ module ActionController
           }
         }
 
-        assert_equal 'application/json', @response.content_type
+        assert_match(%r{\Aapplication/json}, @response.content_type)
         assert_equal expected.to_json, @response.body
       end
 
@@ -183,7 +183,7 @@ module ActionController
           get :render_array_using_custom_root
         end
         expected = { custom_root: [{ name: 'Name 1', description: 'Description 1' }] }
-        assert_equal 'application/json', @response.content_type
+        assert_match(%r{\Aapplication/json}, @response.content_type)
         assert_equal expected.to_json, @response.body
       end
 
@@ -193,7 +193,7 @@ module ActionController
         end
 
         expected = { custom_root: [] }
-        assert_equal 'application/json', @response.content_type
+        assert_match(%r{\Aapplication/json}, @response.content_type)
         assert_equal expected.to_json, @response.body
       end
 
@@ -203,14 +203,14 @@ module ActionController
         end
 
         expected = { custom_root: { name: 'Name 1', description: 'Description 1' } }
-        assert_equal 'application/json', @response.content_type
+        assert_match(%r{\Aapplication/json}, @response.content_type)
         assert_equal expected.to_json, @response.body
       end
 
       def test_render_json_object_without_serializer
         get :render_json_object_without_serializer
 
-        assert_equal 'application/json', @response.content_type
+        assert_match(%r{\Aapplication/json}, @response.content_type)
         expected_body = { error: 'Result is Invalid' }
         assert_equal expected_body.to_json, @response.body
       end
@@ -218,14 +218,14 @@ module ActionController
       def test_render_json_array_object_without_serializer
         get :render_json_array_object_without_serializer
 
-        assert_equal 'application/json', @response.content_type
+        assert_match(%r{\Aapplication/json}, @response.content_type)
         expected_body = [{ error: 'Result is Invalid' }]
         assert_equal expected_body.to_json, @response.body
       end
 
       def test_render_array_using_implicit_serializer
         get :render_array_using_implicit_serializer
-        assert_equal 'application/json', @response.content_type
+        assert_match(%r{\Aapplication/json}, @response.content_type)
 
         expected = [
           {
@@ -261,7 +261,7 @@ module ActionController
           }
         }
 
-        assert_equal 'application/json', @response.content_type
+        assert_match(%r{\Aapplication/json}, @response.content_type)
         assert_equal expected.to_json, @response.body
       end
 
@@ -284,7 +284,7 @@ module ActionController
           }
         }
 
-        assert_equal 'application/json', @response.content_type
+        assert_match(%r{\Aapplication/json}, @response.content_type)
         assert_equal expected.to_json, @response.body
       end
 
@@ -313,7 +313,7 @@ module ActionController
         Timecop.freeze(Time.zone.now) do
           get :render_object_with_cache_enabled
 
-          assert_equal 'application/json', @response.content_type
+          assert_match(%r{\Aapplication/json}, @response.content_type)
           assert_equal expected.to_json, @response.body
 
           get :render_changed_object_with_cache_enabled
@@ -349,7 +349,7 @@ module ActionController
           }
         }
 
-        assert_equal 'application/json', @response.content_type
+        assert_match(%r{\Aapplication/json}, @response.content_type)
         actual   = @response.body
         expected = expected.to_json
         if ENV['APPVEYOR'] && actual != expected
@@ -364,7 +364,7 @@ module ActionController
         get :render_fragment_changed_object_with_only_cache_enabled
         response = JSON.parse(@response.body)
 
-        assert_equal 'application/json', @response.content_type
+        assert_match(%r{\Aapplication/json}, @response.content_type)
         assert_equal 'ZOMG A ROLE', response['name']
         assert_equal 'HUEHUEBRBR', response['description']
       end
@@ -374,7 +374,7 @@ module ActionController
         get :render_fragment_changed_object_with_except_cache_enabled
         response = JSON.parse(@response.body)
 
-        assert_equal 'application/json', @response.content_type
+        assert_match(%r{\Aapplication/json}, @response.content_type)
         assert_equal 5, response['rating']
         assert_equal 'lol', response['content']
       end
@@ -395,7 +395,7 @@ module ActionController
             }
           }
 
-          assert_equal 'application/json', @response.content_type
+          assert_match(%r{\Aapplication/json}, @response.content_type)
           assert_equal expected_return, response
         end
       end
@@ -426,7 +426,7 @@ module ActionController
 
         get :update_and_render_object_with_cache_enabled
 
-        assert_equal 'application/json', @response.content_type
+        assert_match(%r{\Aapplication/json}, @response.content_type)
         actual   = @response.body
         expected = expected.to_json
         if ENV['APPVEYOR'] && actual != expected

test/grape_test.rb

@@ -1,198 +0,0 @@
-# frozen_string_literal: true
-
-require 'test_helper'
-TestHelper.silence_warnings do
-  require 'grape'
-end
-require 'grape/active_model_serializers'
-require 'kaminari'
-require 'kaminari/hooks'
-::Kaminari::Hooks.init
-
-module ActiveModelSerializers
-  class GrapeTest < ActiveSupport::TestCase
-    include Rack::Test::Methods
-    module Models
-      def self.model1
-        ARModels::Post.new(id: 1, title: 'Dummy Title', body: 'Lorem Ipsum')
-      end
-
-      def self.model2
-        ARModels::Post.new(id: 2, title: 'Second Dummy Title', body: 'Second Lorem Ipsum')
-      end
-
-      def self.all
-        @all ||=
-          begin
-            model1.save!
-            model2.save!
-            ARModels::Post.all
-          end
-      end
-
-      def self.reset_all
-        ARModels::Post.delete_all
-        @all = nil
-      end
-
-      def self.collection_per
-        2
-      end
-
-      def self.collection
-        @collection ||=
-          begin
-            Kaminari.paginate_array(
-              [
-                Profile.new(id: 1, name: 'Name 1', description: 'Description 1', comments: 'Comments 1'),
-                Profile.new(id: 2, name: 'Name 2', description: 'Description 2', comments: 'Comments 2'),
-                Profile.new(id: 3, name: 'Name 3', description: 'Description 3', comments: 'Comments 3'),
-                Profile.new(id: 4, name: 'Name 4', description: 'Description 4', comments: 'Comments 4'),
-                Profile.new(id: 5, name: 'Name 5', description: 'Description 5', comments: 'Comments 5')
-              ]
-            ).page(1).per(collection_per)
-          end
-      end
-    end
-
-    class GrapeTest < Grape::API
-      format :json
-      TestHelper.silence_warnings do
-        include Grape::ActiveModelSerializers
-      end
-
-      def self.resources(*)
-        TestHelper.silence_warnings do
-          super
-        end
-      end
-
-      resources :grape do
-        get '/render' do
-          render Models.model1
-        end
-
-        get '/render_with_json_api' do
-          post = Models.model1
-          render post, meta: { page: 1, total_pages: 2 }, adapter: :json_api
-        end
-
-        get '/render_array_with_json_api' do
-          posts = Models.all
-          render posts, adapter: :json_api
-        end
-
-        get '/render_collection_with_json_api' do
-          posts = Models.collection
-          render posts, adapter: :json_api
-        end
-
-        get '/render_with_implicit_formatter' do
-          Models.model1
-        end
-
-        get '/render_array_with_implicit_formatter' do
-          Models.all
-        end
-
-        get '/render_collection_with_implicit_formatter' do
-          Models.collection
-        end
-      end
-    end
-
-    def app
-      Grape::Middleware::Globals.new(GrapeTest.new)
-    end
-
-    extend Minitest::Assertions
-    def self.run_one_method(*)
-      _, stderr = capture_io do
-        super
-      end
-      fail Minitest::Assertion, stderr if stderr !~ /grape/
-    end
-
-    def test_formatter_returns_json
-      get '/grape/render'
-
-      post = Models.model1
-      serializable_resource = serializable(post)
-
-      assert last_response.ok?
-      assert_equal serializable_resource.to_json, last_response.body
-    end
-
-    def test_render_helper_passes_through_options_correctly
-      get '/grape/render_with_json_api'
-
-      post = Models.model1
-      serializable_resource = serializable(post, serializer: ARModels::PostSerializer, adapter: :json_api, meta: { page: 1, total_pages: 2 })
-
-      assert last_response.ok?
-      assert_equal serializable_resource.to_json, last_response.body
-    end
-
-    def test_formatter_handles_arrays
-      get '/grape/render_array_with_json_api'
-
-      posts = Models.all
-      serializable_resource = serializable(posts, adapter: :json_api)
-
-      assert last_response.ok?
-      assert_equal serializable_resource.to_json, last_response.body
-    ensure
-      Models.reset_all
-    end
-
-    def test_formatter_handles_collections
-      get '/grape/render_collection_with_json_api'
-      assert last_response.ok?
-
-      representation = JSON.parse(last_response.body)
-      assert representation.include?('data')
-      assert representation['data'].count == Models.collection_per
-      assert representation.include?('links')
-      assert representation['links'].count > 0
-    end
-
-    def test_implicit_formatter
-      post = Models.model1
-      serializable_resource = serializable(post, adapter: :json_api)
-
-      with_adapter :json_api do
-        get '/grape/render_with_implicit_formatter'
-      end
-
-      assert last_response.ok?
-      assert_equal serializable_resource.to_json, last_response.body
-    end
-
-    def test_implicit_formatter_handles_arrays
-      posts = Models.all
-      serializable_resource = serializable(posts, adapter: :json_api)
-
-      with_adapter :json_api do
-        get '/grape/render_array_with_implicit_formatter'
-      end
-
-      assert last_response.ok?
-      assert_equal serializable_resource.to_json, last_response.body
-    ensure
-      Models.reset_all
-    end
-
-    def test_implicit_formatter_handles_collections
-      with_adapter :json_api do
-        get '/grape/render_collection_with_implicit_formatter'
-      end
-
-      representation = JSON.parse(last_response.body)
-      assert last_response.ok?
-      assert representation.include?('data')
-      assert representation['data'].count == Models.collection_per
-      assert representation.include?('links')
-      assert representation['links'].count > 0
-    end
-  end
-end

test/support/isolated_unit.rb

@@ -68,6 +68,7 @@ module TestHelpers
         fake_logger = Logger.new(nil)
         config.logger = fake_logger
         Rails.application.routes.default_url_options = { host: 'example.com' }
+        config.hosts << 'www.example.com' if Rails.version >= '6.0'
       end
       def app.name; 'IsolatedRailsApp'; end # rubocop:disable Style/SingleLineMethods
       app.respond_to?(:secrets) && app.secrets.secret_key_base = '3b7cd727ee24e8444053437c36cc66c4'

test/support/rails_app.rb

@@ -14,6 +14,8 @@ module ActiveModelSerializers
       end
 
       config.filter_parameters += [:password]
+
+      config.hosts << 'www.example.com' if Rails.version >= '6.0'
     end
 
     app.routes.default_url_options = { host: 'example.com' }

test/test_helper.rb

@@ -4,13 +4,6 @@
 ENV['RAILS_ENV'] = 'test'
 require 'bundler/setup'
 
-begin
-  require 'simplecov'
-  AppCoverage.start
-rescue LoadError
-  STDERR.puts 'Running without SimpleCov'
-end
-
 require 'pry'
 require 'timecop'
 require 'rails'