#!/bin/sh

test_description='test @{-N} syntax'

. ./test-lib.sh


make_commit () {
        echo "$1" > "$1" &&
        git add "$1" &&
        git commit -m "$1"
}


test_expect_success 'setup' '

        make_commit 1 &&
        git branch side &&
        make_commit 2 &&
        make_commit 3 &&
        git checkout side &&
        make_commit 4 &&
        git merge master &&
        git checkout master

'

# 1 -- 2 -- 3 master
#  \         \
#   \         \
#    --- 4 --- 5 side
#
# and 'side' should be the last branch

git log --graph --all --pretty=oneline --decorate

test_rev_equivalent () {

        git rev-parse "$1" > expect &&
        git rev-parse "$2" > output &&
        test_cmp expect output

}

test_expect_success '@{-1} works' '
        test_rev_equivalent side @{-1}
'

test_expect_success '@{-1}~2 works' '
        test_rev_equivalent side~2 @{-1}~2
'

test_expect_success '@{-1}^2 works' '
        test_rev_equivalent side^2 @{-1}^2
'

test_expect_failure '@{-1}@{1} works' '
        test_rev_equivalent side@{1} @{-1}@{1}
'

test_expect_success '@{-2} works' '
        test_rev_equivalent master @{-2}
'

test_expect_success '@{-3} fails' '
        test_must_fail git rev-parse @{-3}
'

test_done