title: Why aren't RSpec matchers working?
body: <p>When I run this simple RSpec with any basic matcher, it doesn't work:</p>
  <p>File: <a href="https://gist.github.com/trinitronx/5580164" rel="nofollow noreferrer"><code>matcher_spec.rb</code></a></p>
  <pre><code>describe &quot;a simple RSpec matcher&quot; do
      true.should be_true
  end
  </code></pre>
  <p>The output for any matcher used looks like this:</p>
  <pre><code>/private/tmp/rspec_matcher_test/matcher_spec.rb:3:in `block in &lt;top (required)&gt;': undefined local variable or method `be_true' for #&lt;Class:0x007fdcd60ccb40&gt; (NameError)
      from /Users/jcuzella/.rvm/gems/ruby-1.9.3-p392/gems/rspec-core-2.13.1/lib/rspec/core/example_group.rb:242:in `module_eval'
      from /Users/jcuzella/.rvm/gems/ruby-1.9.3-p392/gems/rspec-core-2.13.1/lib/rspec/core/example_group.rb:242:in `subclass'
      from /Users/jcuzella/.rvm/gems/ruby-1.9.3-p392/gems/rspec-core-2.13.1/lib/rspec/core/example_group.rb:228:in `describe'
      from /Users/jcuzella/.rvm/gems/ruby-1.9.3-p392/gems/rspec-core-2.13.1/lib/rspec/core/dsl.rb:18:in `describe'
      from /private/tmp/rspec_matcher_test/matcher_spec.rb:2:in `&lt;top (required)&gt;'
      from /Users/jcuzella/.rvm/gems/ruby-1.9.3-p392/gems/rspec-core-2.13.1/lib/rspec/core/configuration.rb:819:in `load'
      from /Users/jcuzella/.rvm/gems/ruby-1.9.3-p392/gems/rspec-core-2.13.1/lib/rspec/core/configuration.rb:819:in `block in load_spec_files'
      from /Users/jcuzella/.rvm/gems/ruby-1.9.3-p392/gems/rspec-core-2.13.1/lib/rspec/core/configuration.rb:819:in `each'
      from /Users/jcuzella/.rvm/gems/ruby-1.9.3-p392/gems/rspec-core-2.13.1/lib/rspec/core/configuration.rb:819:in `load_spec_files'
      from /Users/jcuzella/.rvm/gems/ruby-1.9.3-p392/gems/rspec-core-2.13.1/lib/rspec/core/command_line.rb:22:in `run'
      from /Users/jcuzella/.rvm/gems/ruby-1.9.3-p392/gems/rspec-core-2.13.1/lib/rspec/core/runner.rb:80:in `run'
      from /Users/jcuzella/.rvm/gems/ruby-1.9.3-p392/gems/rspec-core-2.13.1/lib/rspec/core/runner.rb:17:in `block in autorun'
  </code></pre>
  <p><sub><em>(yes, I'm <a href="https://blog.stackoverflow.com/2011/07/its-ok-to-ask-and-answer-your-own-questions/">answering my own question</a>)</em></sub></p>