Appraisals in closure_tree-6.6.0 vs Appraisals in closure_tree-7.0.0

@@ -1,17 +1,75 @@
 
 appraise 'activerecord-4.2' do
   gem 'activerecord', '~> 4.2.0'
+  platforms :ruby do
+    gem 'mysql2', "< 0.5"
+    gem 'pg', "~> 0.21"
+    gem 'sqlite3'
+  end
+
+  platforms :jruby do
+    gem 'activerecord-jdbcmysql-adapter'
+    gem 'activerecord-jdbcpostgresql-adapter'
+    gem 'activerecord-jdbcsqlite3-adapter'
+  end
 end
 
 appraise 'activerecord-5.0' do
   gem 'activerecord', '~> 5.0.0'
+  platforms :ruby do
+    gem 'mysql2'
+    gem 'pg'
+    gem 'sqlite3'
+  end
+
+  platforms :jruby do
+    gem 'activerecord-jdbcmysql-adapter'
+    gem 'activerecord-jdbcpostgresql-adapter'
+    gem 'activerecord-jdbcsqlite3-adapter'
+  end
 end
 
 appraise 'activerecord-5.1' do
   gem 'activerecord', '~> 5.1.0'
+  platforms :ruby do
+    gem 'mysql2'
+    gem 'pg'
+    gem 'sqlite3'
+  end
+
+  platforms :jruby do
+    gem 'activerecord-jdbcmysql-adapter'
+    gem 'activerecord-jdbcpostgresql-adapter'
+    gem 'activerecord-jdbcsqlite3-adapter'
+  end
 end
 
+appraise 'activerecord-5.2' do
+  gem 'activerecord', '~> 5.2.0'
+  platforms :ruby do
+    gem 'mysql2'
+    gem 'pg'
+    gem 'sqlite3'
+  end
+
+  platforms :jruby do
+    gem 'activerecord-jdbcmysql-adapter'
+    gem 'activerecord-jdbcpostgresql-adapter'
+    gem 'activerecord-jdbcsqlite3-adapter'
+  end
+end
+
 appraise 'activerecord-edge' do
   gem 'activerecord', github: 'rails/rails'
-  gem 'arel', github: 'rails/arel'
+  platforms :ruby do
+    gem 'mysql2'
+    gem 'pg'
+    gem 'sqlite3'
+  end
+
+  platforms :jruby do
+    gem 'activerecord-jdbcmysql-adapter'
+    gem 'activerecord-jdbcpostgresql-adapter'
+    gem 'activerecord-jdbcsqlite3-adapter'
+  end
 end