These exercises lean on Test-Driven Development (TDD), but they're not an exact match. For a more thorough introduction and explanation of TDD (using Minitest in Ruby), see the "Intro to TDD" over at JumpstartLab.
In these exercises, you will be provided a set of tests (instead of having to write your own). Your job is to read the tests, discern what they're asking you to do, then write the code that makes each test pass, one by one. The process should break down like this:
- Run the test suite. It's written using the Minitest framework, and can be
run with
$ ruby hello_world_test.rb. - Read the error. Think about the error. Then make the smallest change possible to the code to fix the error (and just that one error).
- Run the tests again. You may get a new error. If you do, rinse and repeat. Think. Make the smallest change to fix that error. Run the tests again.
- When the first test passes, enable the next test in the suite by removing the
skipin the test code. - Wash, Rinse, Repeat: Delete one
skipat a time, and make each test pass before you move to the next one.
Remember: the goal is to write code that is expressive and readable.
All the tests for these exercises are written using the Minitest gem. This gem is provided in by default in newer distributions of ruby, but you can install it manually using $ gem install minitest if it doesn't appear in the output of $ gem list.
If you would like color output, you can require 'minitest/pride' in the test file. I may have done this in some of the test files already. ^_^
Failing tests (errors) look something like:
# Running:
ESSS
Finished in 0.001539s, 2599.0903 runs/s, 0.0000 assertions/s.
1) Error:
HelloWorldTest#test_no_name:
NameError: uninitialized constant HelloWorldTest::HelloWorld
hello-world/hello_world_test.rb:5:in `test_no_name'
The letters ESSS show that there are four tests altogether,
that one of them has an error (E), and that three of them are skipped (S). The goal is to have four passing tests. Passing tests are shown as dots (.).
The tests are run in a random order, which will result in the letters to display in random order as well.
An error (E) means that Ruby cannot execute the code because of things like missing
files, syntax errors, or referring to things that don't exist.
A test failure (F) is when the program/code runs fine, but the test receives an outcome different from what it was told to expect.
Much of the content of this repo comes from the amazing Exercism project. I've adapted and modified language and exercises found there for the Ada classroom. All content in this repository is relased under the GNU Affero General Public License. Copyright © 2016, Ada Developers Academy.