xRuby

Exercism Exercises in Ruby

Setup

You'll need a recent (1.9.3+) version of Ruby, but that's it. Minitest ships with the language, so you're all set.

Working on Test Suites

Each problem should have a test suite and an example solution. The example solution should be named example.rb.

Some test suites are generated from shared inputs/outputs, see Generated Test Suites below. In short, if the problem directory contains an example.tt file, then it's a generated problem.

Hard-coded Test Suites

Run the test with ruby path/to/the_test.rb.

At the moment the Ruby problems skip all but the first test, in order to not overwhelm people with errors.

If you want to temporarily disable the skips while working on a test suite, you can run the file with a shim that temporarily disables them:

ruby -I./lib -rdisable_skip exercise/exercise/filename_test.rb

It is simpler to use the make tool which is available in the project root. It will disable the skip calls for you automatically, it does the same thing as the above.

If you would like to use the make tool to run a single test, while developing clock, for example, you can do something like this:

ASSIGNMENT=clock ARGS='-p' make test-assignment

Where, "ASSIGNMENT" is the variable that holds the name of the lesson, clock.

ARGS is where you can put additional arguments, here I am demonstrating the -p argument which may give you 'pride' output.

If you use zsh, you can use the following function to make this process simple.

xtest () { ASSIGNMENT=$1 ARGS=$2 make test-assignment }

Then you can simply use the command and exercise name, such as:

xtest binary

Or if you would like to use an option such as displaying the test names rather than just the dots, for example:

xtest clock -v

Or with the pride reporter activated:

xtest robot-name -p

Generated Test Suites

If you find an example.tt file in a problem directory, then the test suite is generated from shared data. In this case changing the test file itself will not be enough.

You will need to have cloned the shared metadata at the same level as the xruby repository. E.g.

tree -L 1 ~/code/exercism
├── x-common
└── xruby

xruby/$PROBLEM/example.tt - the Erb template for the test file, $PROBLEM_test.rb.
x-common/$PROBLEM.json - the shared inputs and outputs for the problem.
lib/$PROBLEM.rb - the logic for turning the data into tests.
xruby/bin/generate $PROBLEM - the command to actually generate the test suite.
.version - used to keep track of the version of the test files as the data changes.

Additionally, there is some common generator logic in lib/generator.rb.

For example, take a look at the hamming.json file in the x-common repository, as well as the following files in the xruby repository:

hamming/example.tt
bin/generate hamming
lib/hamming.rb
lib/generator.rb

The hamming/hamming_test.rb will never be edited directly. If there's a missing test case, then additional inputs/outputs should be submitted to the x-common repository.

Changes to the test suite (style, boilerplate, etc) will probably have to be made to example.tt.

Exercise Generators

If you wish to create a new generator, or edit an existing one, the generators currently live in the lib directory and are named $PROBLEM_cases.rb. For example, the hamming generator is lib/hamming_cases.rb.

All generators currently adhere to a common public interface, and must define the following three methods:

test_name - Returns the name of the test (i.e test_one_equals_one)
workload - Returns the main syntax for the test. This will vary depending on the test generator and its underlying implementation
skipped - Returns skip syntax (i.e. skip or # skip)

Pull Requests

We welcome pull requests that provide fixes to existing test suites (missing tests, interesting edge cases, improved APIs), as well as new problems.

If you're unsure, then go ahead and open a GitHub issue, and we'll discuss the change.

Please submit changes to a single problem per pull request unless you're submitting a general change across many of the problems (e.g. formatting).

You can run (some) of the same checks that we run by running the following tool in your terminal:

bin/local-status-check

If you would like to have these run right before you push your commits, you can activate the hook by running this tool in your terminal:

bin/setup-git-hoooks

Thank you so much for contributing! ✨

Style Guide

We have created a minimal set of guidelines for the testing files, which you can take advantage of by installing the rubocop gem. It will use the configuration file located in the root folder, .rubocop.yml. When you edit your code, you can simply run rubocop -D. It will ignore your example.rb, but will gently suggest style for your test code.

The -D option that is suggested is provided to give you the ability to easily ignore the Cops that you think should be ignored. This is easily done by doing # rubocop:disable CopName, where the CopName is replaced appropriately.

For more complete information, see Rubocop.

It is the responsibility of the Ruby test generator to interpret the $PROBLEM.json data in a stylistically correct manner, eg downcase the test method names.

READMEs

Please do not add a README or README.md file to the problem directory. The READMEs are constructed using shared metadata, which lives in the exercism/x-common repository.

Contributing Guide

For an in-depth discussion of how exercism language tracks and problem sets work, please see the contributing guide

License

The MIT License (MIT)

Ruby icon

The Ruby icon is the Vienna.rb logo, and is used with permission. Thanks Floor Dress :)

pgblu/xruby