Please suggest me md-autocomplete unit testcase location?

I am writing unit testcase in angularjs for chipRemove in md-autocomplete.

please tell me location of md-autocomplete in git so that i will use it as a reference.

Further please observe the code snippet and post your suggetions

//code from controller file

$scope.chipRemove = function(chip, index) {

    var autoChild = MyService.getAutoCompleteElement().firstElementChild;

    //MyService.getAutoCompleteElement().firstElementChild is  returning something like <md-autocomplete-wrap></md-autocomplete-wrap>

    var el = angular.element(autoChild);

    el.scope().$mdAutocompleteCtrl.scope.searchText = "";
    //some logic goes here`

}

I am facing error in unit test case file where I am writing unit test case for chipRemove function as below.

[INFO] TypeError: el.scope(...) is undefined