Fix bulk operations tests.
Fix bulk operations tests.

When use mock(v1.3.0), there is no `assert_called` for Mock object,
update three tests to make them pass.

product-definition-center/product-definition-center,pombredanne/product-definition-center,pombredanne/product-definition-center,maxamillion/product-definition-center,lao605/product-definition-center,tzhaoredhat/automation,maxamillion/product-definition-center,puiterwijk/product-definition-center,product-definition-center/product-definition-center,release-engineering/product-definition-center,xychu/product-definition-center,lao605/product-definition-center,puiterwijk/product-definition-center,release-engineering/product-definition-center,release-engineering/product-definition-center,xychu/product-definition-center,lao605/product-definition-center,lao605/product-definition-center,xychu/product-definition-center,maxamillion/product-definition-center,xychu/product-definition-center,pombredanne/product-definition-center,tzhaoredhat/automation,tzhaoredhat/automation,tzhaoredhat/automation,puiterwijk/product-definition-center,product-definition-center/product-definition-center,product-definition-center/product-definition-center,release-engineering/product-definition-center,pombredanne/product-definition-center