Update Ruby to 3.0.2 (#48)

* Update gems & GH Actions to Ruby 3.0.2

See https://hub.docker.com/_/ruby?tab=tags&page=1&name=3.0
and https://github.com/ruby/setup-ruby/blob/v1.84.0/README.md

* Expand testing instructions

* Improve wording

* Repair failing tests after json update

Either json 2.6.1 or File.write seems to append an additional \n
at the end of the parsed results.json. Thus, both assertion
argument need to be treated the same now.

* Set Ruby version also in Gemfile

* Test Ruby3's probably popular syntax elements

See https://www.ruby-lang.org/en/news/2020/12/25/ruby-3-0-0-released/,
but excluding:

- "in is changed …" because that's behaviour
- "Find pattern …" because it's "experimental"
- "Hash#except …" because the test runner doesn't care
   from where the student's code loads this method.

* Bump setup-ruby to v1.85.0

* Bump mandate to 1.0.0

Author: katrinleinweber

.github/workflows/rubocop.yml

@@ -14,9 +14,9 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Set up Ruby
-        uses: ruby/setup-ruby@e27aee156d42e38ff8a4c2fc97b125c4087cbcc7
+        uses: ruby/setup-ruby@a2b2637a7c796d83d566fc82853156d4372b0f60
         with:
-          ruby-version: 2.6.6
+          ruby-version: 3.0.2
           bundler-cache: true
 
       - name: Install gems

.github/workflows/tests.yml

@@ -16,9 +16,9 @@ jobs:
 
       # Setup Ruby - this needs to match the version in the Gemfile
       - name: Set up Ruby
-        uses: ruby/setup-ruby@e27aee156d42e38ff8a4c2fc97b125c4087cbcc7
+        uses: ruby/setup-ruby@a2b2637a7c796d83d566fc82853156d4372b0f60
         with:
-          ruby-version: 2.6.6
+          ruby-version: 3.0.2
           bundler-cache: true
 
       # Setup code climate

.ruby-version

@@ -1 +1 @@
-ruby-2.6.6
+ruby-3.0.2

Dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:2.5-alpine
+FROM ruby:3.0.2-alpine
 
 RUN apk update && apk upgrade && \
     apk add --no-cache bash git openssh && \
@@ -10,7 +10,7 @@ RUN wget -P /usr/local/bin https://github.com/exercism/tooling-webserver/release
 WORKDIR /opt/test-runner
 
 COPY Gemfile Gemfile.lock ./
-RUN gem install bundler:2.1.4 && \
+RUN gem install bundler:2.2.29 && \
     bundle config set without 'development test' && \
     bundle install
 

Gemfile

@@ -5,9 +5,11 @@ git_source(:github) do |repo_name|
   "https://github.com/#{repo_name}.git"
 end
 
-gem 'mandate'
+ruby '3.0.2'
+
+gem "mandate", "~> 1.0.0"
 gem 'rake'
-gem 'json'
+gem 'json', '~> 2.6.1'
 gem 'minitest', '~> 5.11.3'
 
 gem 'parser'

Gemfile.lock

@@ -1,16 +1,16 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    ast (2.4.1)
+    ast (2.4.2)
     coderay (1.1.3)
     docile (1.3.2)
-    json (2.2.0)
-    mandate (0.3.0)
+    json (2.6.1)
+    mandate (1.0.0)
     method_source (1.0.0)
     minitest (5.11.3)
     mocha (1.11.2)
     parallel (1.19.2)
-    parser (2.7.1.4)
+    parser (3.0.2.0)
       ast (~> 2.4.1)
     pry (0.13.1)
       coderay (~> 1.1)
@@ -46,8 +46,8 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  json
-  mandate
+  json (~> 2.6.1)
+  mandate (~> 1.0.0)
   minitest (~> 5.11.3)
   mocha
   parser
@@ -59,5 +59,8 @@ DEPENDENCIES
   rubocop-performance
   simplecov (~> 0.17.0)
 
+RUBY VERSION
+   ruby 3.0.2p107
+
 BUNDLED WITH
-   2.1.4
+   2.2.29

README.md

@@ -17,10 +17,15 @@ For example:
 Before running the tests, first install the dependencies:
 
 ```bash
+bundle config set --local with 'test'
 bundle install
 ```
 
-Then, run the following command to run the tests:
+Then, in [test/test_helper.rb](test/test_helper.rb),
+comment the "Production command" `system(…)` out
+and uncomment either of the "Testing commands".
+
+Lastly, run the following command to run the tests:
 
 ```bash
 bundle exec rake test

test/fixtures/pass_ruby_3_syntax/input/ruby_3_syntax.rb

@@ -0,0 +1,10 @@
+# See section "Other Notable New Features"
+# in https://www.ruby-lang.org/en/news/2020/12/25/ruby-3-0-0-released/
+class Ruby3Syntax
+  def self.rightward_assign
+    'is fun' => exercism
+    return exercism
+  end
+
+  def self.endless_methods = 'are fun'
+end

test/fixtures/pass_ruby_3_syntax/input/ruby_3_syntax_test.rb

@@ -0,0 +1,14 @@
+require 'minitest/autorun'
+require_relative 'ruby_3_syntax'
+
+# minimal set of:
+# Common test data version: 1.6.0 42b9d45
+class Ruby3SyntaxTest < Minitest::Test
+  def test_rightward_assign
+    assert_equal Ruby3Syntax.rightward_assign, 'is fun'
+  end
+
+  def test_endless_method_def
+    assert_equal Ruby3Syntax.endless_methods, 'are fun'
+  end
+end

test/test_helper.rb

@@ -61,7 +61,7 @@ def run_test_runner(input_dir, output_dir)
     # exec("bin/run.sh two_fer #{input_dir} #{output_dir}")
     # system("bin/run.sh two_fer #{input_dir} #{output_dir}")
 
-    # Main command
+    # Production command
     system("bin/run.sh two_fer #{input_dir} #{output_dir}", out: "/dev/null", err: "/dev/null")
   end
 end