Drop support for Rails 4.0 and Ruby 2.0.0

test/active_model_serializers/test/serializer_test.rb

@@ -10,9 +10,8 @@ module ActiveModelSerializers
           render json: Profile.new(name: 'Name 1', description: 'Description 1', comments: 'Comments 1')
         end
 
-        # For Rails4.0
         def render_some_text
-          Rails.version > '4.1' ? render(plain: 'ok') : render(text: 'ok')
+          render(plain: 'ok')
         end
       end
 

test/array_serializer_test.rb

@@ -3,34 +3,19 @@ require_relative 'collection_serializer_test'
 
 module ActiveModel
   class Serializer
-    # Minitest.run_one_method isn't present in minitest 4
-    if $minitest_version > 4 # rubocop:disable Style/GlobalVars
-      class ArraySerializerTest < CollectionSerializerTest
-        extend Minitest::Assertions
-        def self.run_one_method(*)
-          _, stderr = capture_io do
-            super
-          end
-          if stderr !~ /NOTE: ActiveModel::Serializer::ArraySerializer.new is deprecated/
-            fail Minitest::Assertion, stderr
-          end
+    class ArraySerializerTest < CollectionSerializerTest
+      extend Minitest::Assertions
+      def self.run_one_method(*)
+        _, stderr = capture_io do
+          super
         end
-
-        def collection_serializer
-          ArraySerializer
+        if stderr !~ /NOTE: ActiveModel::Serializer::ArraySerializer.new is deprecated/
+          fail Minitest::Assertion, stderr
         end
       end
-    else
-      class ArraySerializerTest < ActiveSupport::TestCase
-        def test_json_key_with_root_warns_when_using_array_serializer
-          _, stderr = capture_io do
-            comment = Comment.new
-            post = Post.new
-            serializer = ArraySerializer.new([comment, post])
-            assert_equal 'comments', serializer.json_key
-          end
-          assert_match(/NOTE: ActiveModel::Serializer::ArraySerializer.new is deprecated/, stderr)
-        end
+
+      def collection_serializer
+        ArraySerializer
       end
     end
   end

test/test_helper.rb

@@ -20,27 +20,9 @@ require 'fileutils'
 FileUtils.mkdir_p(File.expand_path('../../tmp/cache', __FILE__))
 
 gem 'minitest'
-begin
-  require 'minitest'
-rescue LoadError
-  # Minitest 4
-  require 'minitest/autorun'
-  $minitest_version = 4
-  # https://github.com/seattlerb/minitest/blob/644a52fd0/lib/minitest/autorun.rb
-  # https://github.com/seattlerb/minitest/blob/644a52fd0/lib/minitest/unit.rb#L768-L787
-  # Ensure backward compatibility with Minitest 4
-  Minitest = MiniTest unless defined?(Minitest)
-  Minitest::Test = MiniTest::Unit::TestCase
-else
-  # Minitest 5
-  require 'minitest/autorun'
-  $minitest_version = 5
-  # https://github.com/seattlerb/minitest/blob/e21fdda9d/lib/minitest/autorun.rb
-  # https://github.com/seattlerb/minitest/blob/e21fdda9d/lib/minitest.rb#L45-L59
-  # Filter out Minitest backtrace while allowing backtrace from other libraries
-  # to be shown.
-  Minitest.backtrace_filter = Minitest::BacktraceFilter.new
-end
+require 'minitest'
+require 'minitest/autorun'
+Minitest.backtrace_filter = Minitest::BacktraceFilter.new
 
 require 'support/rails_app'