grep "set up to track" actual &&
git checkout heavytrack
'
+
+test_expect_success 'setup tracking with branch --set-upstream on existing branch' '
+ git branch from-master master &&
+ test_must_fail git config branch.from-master.merge > actual &&
+ git branch --set-upstream from-master master &&
+ git config branch.from-master.merge > actual &&
+ grep -q "^refs/heads/master$" actual
+'
+
+test_expect_success '--set-upstream does not change branch' '
+ git branch from-master2 master &&
+ test_must_fail git config branch.from-master2.merge > actual &&
+ git rev-list from-master2 &&
+ git update-ref refs/heads/from-master2 from-master2^ &&
+ git rev-parse from-master2 >expect2 &&
+ git branch --set-upstream from-master2 master &&
+ git config branch.from-master.merge > actual &&
+ git rev-parse from-master2 >actual2 &&
+ grep -q "^refs/heads/master$" actual &&
+ cmp expect2 actual2
+'
test_done