Avoid built-in old test-unit

In Ruby <= 2.1, `test-unit` was shipped with Ruby itself (unbundling was done for 2.2 -- see <https://bugs.ruby-lang.org/issues/9711>). The `test-unit` version shipped with 2.1 breaks some of the tests. To fix this, I've added the minimum needed version explicitly to the `gemspec`, as well as added a `gems.rb` for allowing the use of `bundler` to run the tests and ensure the correct `test-unit` is used.
ruby · Feb 9, 2021 · 098295f · 098295f
1 parent 1773502
commit 098295f
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diff --git a/gems.rb b/gems.rb
@@ -0,0 +1,3 @@
+source 'https://rubygems.org'
+
+gemspec
diff --git a/ruby2_keywords.gemspec b/ruby2_keywords.gemspec
@@ -19,4 +19,6 @@ Gem::Specification.new do |s|
   s.files = [
     "lib/ruby2_keywords.rb",
   ]
+  s.add_development_dependency 'test-unit', '>= 2.2'
+  s.add_development_dependency 'rake'
 end