fix order dependent test related to migration

If the order in which tests are executed is changed then test fails.
This commit ensures that all migrations are run before ensuring that
there are no pending migration.

activerecord/test/cases/migration_test.rb

@@ -846,6 +846,10 @@ def test_copying_migrations_to_empty_directory
   end
 
   def test_check_pending_with_stdlib_logger
+    migrations_path = MIGRATIONS_ROOT + "/valid"
+    ActiveRecord::Migrator.migrations_paths = migrations_path
+    ActiveRecord::Migrator.up migrations_path
+
     old, ActiveRecord::Base.logger = ActiveRecord::Base.logger, ::Logger.new($stdout)
     quietly do
       assert_nothing_raised { ActiveRecord::Migration::CheckPending.new(Proc.new {}).call({}) }