app.js

var app = angular.module('app',[]);

app.config(function($http){
  /* a request we're wanting to stub */
  $http.get('/example').then(function(){
    // handle example
  });
});

app_test.js

describe('app', function (){
  var app = angular.module('app-mock', ['ngMock','app']);

  app.config(function($httpBackend){
    $httpBackend.when('GET', '/example').respond(200, {});
  });
  
  beforeEach(module('app-mock'));

  it('does something', function(){
    expect(true).toBeTruthy();
  })
});