<button type="button" class="btn btn-primary" ng-click="$ctrl.showCode()">Test Code</button>
<button type="button" class="btn btn-primary" ng-click="$ctrl.clearCode()">Reset All</button>

{{$ctrl.codeShow}}

angular.
  module('phonecatApp').
  component('testCode', {
    templateUrl: 'Components/test-code/test-code.template.html',
    controller: [function TestCodeController() {
      var self = this;

  self.code = '';
  self.codeShow = '';

  self.showCode = function showCode()
  {
    self.codeShow = self.code;
  }

  self.clearCode = function clearCode()
  {
    self.codeShow = '';
    self.code = '';
  }

  }]
  });