Lets say we define a module 'A' with dependencies 'B' and 'C':

angular.module('A', ['B', 'C']).service('ServiceA', function(ServiceB) {
  var val= ServiceB.getVal();
  // do whatever A does
});

Now when I'm unit testing ServiceA in Jasmine, I want to mock out ServiceB.
I can do it such:

beforeEach(function() {
  angular.module('B', []).service('ServiceB', function() {
    this.getVal= function() {
      return 1; // My mock value
    };
   });
);

// do my tests on ServiceA

This works fine, my mocked ServiceB gets injected into ServiceA. The 
problem is that it happens globally, not just in this unit test. So every 
subsequent unit test gets this mocked version of ServiceB, even the unit 
test that is intended to test ServiceB.

Is there anyway to save the value of ServiceB before I mock it and then 
restore it in a afterEach after the unit test is finished?

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