fix `rake test_sqlite3_mem`.
While running Sqlite3 memory tests I encountered the following error: ``` Finished in 69.416366s, 58.0267 runs/s, 162.3681 assertions/s. 1) Error: ActiveRecord::Migration::ChangeSchemaTest#test_add_column_with_timestamp_type: NoMethodError: undefined method `type' for nil:NilClass /Users/senny/Projects/rails/activerecord/test/cases/migration/change_schema_test.rb:244:in `test_add_column_with_timestamp_type' 4028 runs, 11271 assertions, 0 failures, 1 errors, 1 skips ``` This was because the table `testings` was used in multiple test-cases. This resulted in a wrongly cached schema on `ActiveRecord::Base.schema_chae`. /cc @zuhao
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