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== SetupIf you don't have the environment set make sure to read http://edgeguides.rubyonrails.org/contributing_to_ruby_on_rails.html#testing-active-record.== Running the TestsYou can run a particular test file from the command line, e.g. $ ruby -Itest test/cases/base_test.rbTo run a specific test: $ ruby -Itest test/cases/base_test.rb -n test_something_worksYou can run with a database other than the default you set in test/config.yml, using the ARCONNenvironment variable: $ ARCONN=postgresql ruby -Itest test/cases/base_test.rbYou can run all the tests for a given database via rake: $ rake test_mysqlThe 'rake test' task will run all the tests for mysql, mysql2, sqlite3 and postgresql.== Custom Config fileBy default, the config file is expected to be at the path test/config.yml. You can specify acustom location with the ARCONFIG environment variable.