Rails 5 Test Prescriptions

Running Minitest

Rails provides some standard tasks for running all or part of the test suite.

The one to use most of the time, which is not the Rails default, is rails test (often bin/rails test, depending on how your bundle is set up); it grabs any files ending with _test.rb in the test directory or any of its subdirectories (except for system tests) and executes them through Minitest. For running a single file or directory, Minitest and Rails use the syntax rails test test/models/task_test.rb. For now let’s assume you’re using rails test. In Chapter 16, ​Running Tests Faster and Running Faster Tests​, I’ll cover better ways to focus test execution.

When you run racks test, the Rake task identifies any files matching the pattern test/**/*_test.rb ...