Add integration tests

test/integration/unsetUpstream/setup.sh

@@ -0,0 +1,36 @@
+#!/bin/sh
+
+set -e
+
+set -e
+
+cd $1
+
+git init
+
+git config user.email "CI@example.com"
+git config user.name "CI"
+
+echo test1 > myfile1
+git add .
+git commit -am "myfile1"
+echo test2 > myfile2
+git add .
+git commit -am "myfile2"
+echo test3 > myfile3
+git add .
+git commit -am "myfile3"
+echo test4 > myfile4
+git add .
+git commit -am "myfile4"
+
+cd ..
+git clone --bare ./repo origin
+
+cd repo
+
+git reset --hard HEAD~2
+git remote add origin ../origin
+git fetch origin
+git branch --set-upstream-to=origin/master
+