title: Rspec: Could not find minitest-4.7.5 in any of the sources
body: <p>This is bizarre because I am relatively certain that minitest is an independent testing framework from <code>rspec</code>. </p>
  
  <p>In any case, what is happening is that when I run. </p>
  
  <p><code>rspec</code> at my rails root directory, I get this error: </p>
  
  <pre><code>Could not find minitest-4.7.5 in any of the sources
  </code></pre>
  
  <p>However in my <code>Gemfile</code> I have the following: </p>
  
  <pre><code>gem 'minitest', '~&gt; 4.7.5'
  </code></pre>
  
  <p>I have tried running <code>bundle update</code> and <code>bundle install</code> to no avail. Also I feel weird even adding the gem file as I only added it <em>after</em> I got the error but had no intention of using the gem to begin with. </p>
  
  <p>For reference here is my <code>spec_helper.rb</code> file. </p>
  
  <pre><code>require 'rubygems'
  ENV["RAILS_ENV"] ||= 'test'
  require File.expand_path("../../config/environment", __FILE__)
  </code></pre>