only run tests with sqlite

activerecord/Rakefile

@@ -25,9 +25,7 @@ task :default => :test
 
 desc 'Run mysql, mysql2, sqlite, and postgresql tests'
 task :test do
-  tasks = defined?(JRUBY_VERSION) ?
-    %w(test_jdbcmysql test_jdbcsqlite3 test_jdbcpostgresql) :
-    %w(test_mysql test_mysql2 test_sqlite3 test_postgresql)
+  tasks = %w(test_sqlite3)
   run_without_aborting(*tasks)
 end