Include running mariadb on travis

- Specify we want to run on latest stable ruby for mariadb

- change in runs of builds

Make mariadb? method publicly available

.travis.yml

@@ -31,6 +31,11 @@ rvm:
 matrix:
   include:
     # Latest compiled version in http://rubies.travis-ci.org
+    - rvm: 2.3.0
+      env:
+        - "GEM=ar:mysql2"
+      addons:
+        mariadb: 10.0
     - rvm: jruby-9.0.5.0
       jdk: oraclejdk8
       env:

activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb

@@ -81,6 +81,10 @@ def version
         @version ||= Version.new(full_version.match(/^\d+\.\d+\.\d+/)[0])
       end
 
+      def mariadb? # :nodoc:
+        full_version =~ /mariadb/i
+      end
+
       # Returns true, since this connection adapter supports migrations.
       def supports_migrations?
         true
@@ -782,10 +786,6 @@ def subquery_for(key, select)
         subselect.from subsubselect.as('__active_record_temp')
       end
 
-      def mariadb?
-        full_version =~ /mariadb/i
-      end
-
       def supports_rename_index?
         mariadb? ? false : version >= '5.7.6'
       end

activerecord/test/cases/time_precision_test.rb

@@ -44,6 +44,7 @@ def test_invalid_time_precision_raises_error
   end
 
   def test_formatting_time_according_to_precision
+    skip("TIME column on MariaDB doesn't ignore the date part of the string when it coerces to time") if current_adapter?(:Mysql2Adapter) && ActiveRecord::Base.connection.mariadb?
     @connection.create_table(:foos, force: true) do |t|
       t.time :start,  precision: 0
       t.time :finish, precision: 4