Merge pull request #1793 from codidact/trichoplax/correctly-name-system-test-as-plural

Rename system test to follow convention of being plural

Author: Oaphi

test/system/post_system_test.rb test/system/posts_test.rbtest/system/post_system_test.rb renamed to test/system/posts_test.rb

@@ -1,8 +1,6 @@
 require 'application_system_test_case'
 
-# Renamed from PostTest to PostSystemTest to avoid clash with test/models/post_test.rb
-# when running rails test:all
-class PostSystemTest < ApplicationSystemTestCase
+class PostsTest < ApplicationSystemTestCase
   # -------------------------------------------------------
   # Create
   # -------------------------------------------------------