Get the described instance method name(as long as it follows the `describe '#method_name'` convention) in RSpec from within a shared spec, so it can call the method regardless of what it is. Useful when different methods share the same behavior (as an alternative to a block or paramter with the method name)

some_class_spec.rb

describe SomeClass do
  shared_examples_for 'a nice method' do
    let(:method) { example.metadata[:example_group][:example_group][:description].gsub /\#/,'' }

    it 'should do nice things' do
      ...
      # This will call subject.foo_method or subject.bar_method, according to context
      subject.send(method) 
      ...
    end
  end

  describe '#foo_method' do
    it_behaves_like 'a nice method'
    ...
  end
  
  describe '#bar_method' do
    it_behaves_like 'a nice method'
    ...
  end  
end