Programming Ruby 3.3

Organizing and Running Tests

The test cases we’ve seen so far are all runnable Ruby programs. If, for example, the test case for the Roman class was in a file called test_roman.rb, we could run the tests from the command line using this:

$ ruby test_roman.rb
Run options: --seed 29842
# Running:
..
Finished in 0.000407s, 4914.0040 runs/s, 17199.0141 assertions/s.
2 runs, 7 assertions, 0 failures, 0 errors, 0 skips

Minitest is clever enough to run the tests even though there’s no main program. It collects all the test case classes and runs each in turn.

If we want, we can ask it to run a particular set of test methods based on a naming pattern:

$ ruby test_roman.rb -n test_range
Run options: -n test_range --seed ...