Fix test which prevents connection reset on failing and remove hardco…

…ded connection

[#4689 state:committed]

Signed-off-by: Jeremy Kemper <jeremy@bitsweat.net>

activerecord/test/cases/adapter_test.rb

@@ -65,15 +65,14 @@ def test_show_nonexistent_variable_returns_nil
     end
 
     def test_not_specifying_database_name_for_cross_database_selects
-      assert_nothing_raised do
-        ActiveRecord::Base.establish_connection({
-          :adapter  => 'mysql',
-          :username => 'rails'
-        })
-        ActiveRecord::Base.connection.execute "SELECT activerecord_unittest.pirates.*, activerecord_unittest2.courses.* FROM activerecord_unittest.pirates, activerecord_unittest2.courses"
+      begin
+        assert_nothing_raised do
+          ActiveRecord::Base.establish_connection(ActiveRecord::Base.configurations['arunit'].except(:database))
+          ActiveRecord::Base.connection.execute "SELECT activerecord_unittest.pirates.*, activerecord_unittest2.courses.* FROM activerecord_unittest.pirates, activerecord_unittest2.courses"
+        end
+      ensure
+        ActiveRecord::Base.establish_connection 'arunit'
       end
-
-      ActiveRecord::Base.establish_connection 'arunit'
     end
   end