Fix sinon.stub deprecation warnings

Calls to `sinon.stub(obj, 'meth', fn)` are deprecated and therefore
replaced by `sinon.stub(obj, 'meth).callsFake(fn)` as instructed by
the deprecation warning.

This makes the js unit testing output readable again.

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

1 files changed, 1 insertions, 1 deletions

diff --git a/core/js/tests/specs/jquery.avatarSpec.js b/core/js/tests/specs/jquery.avatarSpec.js
index 9bb10c41be7..dab78500d0b 100644
--- a/core/js/tests/specs/jquery.avatarSpec.js
+++ b/core/js/tests/specs/jquery.avatarSpec.js
@@ -186,7 +186,7 @@ describe('jquery.avatar tests', function() {
 		});
 
 		it('with ie8 fix', function() {
-			sinon.stub(Math, 'random', function() {
+			sinon.stub(Math, 'random').callsFake(function() {
 				return 0.5;
 			});