fix(alert): allow interpolations with dismiss-on-timeout

Fixes #4665
Closes #4666

Author: Foxandxss

src/alert/alert.js

@@ -1,12 +1,15 @@
 angular.module('ui.bootstrap.alert', [])
 
-.controller('UibAlertController', ['$scope', '$attrs', '$timeout', function($scope, $attrs, $timeout) {
+.controller('UibAlertController', ['$scope', '$attrs', '$interpolate', '$timeout', function($scope, $attrs, $interpolate, $timeout) {
   $scope.closeable = !!$attrs.close;
 
-  if (angular.isDefined($attrs.dismissOnTimeout)) {
+  var dismissOnTimeout = angular.isDefined($attrs.dismissOnTimeout) ?
+    $interpolate($attrs.dismissOnTimeout)($scope.$parent) : null;
+
+  if (dismissOnTimeout) {
     $timeout(function() {
       $scope.close();
-    }, parseInt($attrs.dismissOnTimeout, 10));
+    }, parseInt(dismissOnTimeout, 10));
   }
 }])
 

src/alert/test/alert.spec.js

@@ -136,6 +136,19 @@ describe('uib-alert', function() {
     $timeout.flush();
     expect(scope.removeAlert).toHaveBeenCalled();
   });
+
+  it('should not close immediately with a dynamic dismiss-on-timeout', function() {
+    scope.removeAlert = jasmine.createSpy();
+    scope.dismissTime = 500;
+    $compile('<uib-alert close="removeAlert()" dismiss-on-timeout="{{dismissTime}}">Default alert!</uib-alert>')(scope);
+    scope.$digest();
+
+    $timeout.flush(100);
+    expect(scope.removeAlert).not.toHaveBeenCalled();
+
+    $timeout.flush(500);
+    expect(scope.removeAlert).toHaveBeenCalled();
+  });
 });
 
 /* Deprecation tests below */