Add feature test for branch mutation and close issue #154
Add feature test for branch mutation and close issue #154

firstval/github,befairyliu/github,davengeo/github,peter-murach/github,durai145/github,yaoxiaoyong/github,cocktail-io/github,MalachiTatum/github,samphilipd/github,piotrmurach/github,wicky-info/github,anabhilash619/github,joshsoftware/github