bug in git

git_merge_bug.sh

git init gitbug
cd gitbug/
mkdir test
echo "hi" > test/test.txt
git add .
git commit -am "initial revision"
git checkout -b branch1
git mv test/ test2
git commit -am "renamed test to test2"
git checkout master
echo "change on master" >> test/test.txt 
git commit -am "made a change on master"
git checkout branch1
echo "change on branch1" >> test2/test.txt 
git merge master
cat test2/test.txt