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inject
function
Allows injecting dependencies in beforeEach() and it().
inject(tokens: any[], fn: Function): () => any
    Parameters
tokens | 
        any[] | 
        |
fn | 
        Function | 
        
Returns
() => any
Description
Example:
beforeEach(inject([Dependency, AClass], (dep, object) => {
  // some code that uses `dep` and `object`
  // ...
}));
it('...', inject([AClass], (object) => {
  object.doSomething();
  expect(...);
})
   Notes:
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Licensed under the Creative Commons Attribution License 4.0.
 https://v7.angular.io/api/core/testing/inject