title: What does the underscores in _servicename_ mean in AngularJS tests?
body: <p>In the following example test, the original provider name is APIEndpointProvider, but for injection and service instantiation the convention seems to be it has to be injected with underscores wrapping it. Why is that?</p>
  
  <pre><code>'use strict';
  
  describe('Provider: APIEndpointProvider', function () {
  
    beforeEach(module('myApp.providers'));
  
    var APIEndpointProvider;
    beforeEach(inject(function(_APIEndpointProvider_) {
      APIEndpointProvider = _APIEndpointProvider_;
    }));
  
    it('should do something', function () {
      expect(!!APIEndpointProvider).toBe(true);
    });
  
  });
  </code></pre>
  
  <p>What is the convention I'm missing a better explanation to?</p>