checkout: implement "-" abbreviation, add docs and tests

diff --git a/t/t6200-fmt-merge-msg.sh b/t/t6200-fmt-merge-msg.sh
index bc74349416d858834c43f6c648daa95c8b9f3a7a..8f5a06f7dd8383722022eb7a8abd0ff9bafa6f45 100755 (executable)
--- a/t/t6200-fmt-merge-msg.sh
+++ b/t/t6200-fmt-merge-msg.sh
@@ -83,13 +83,13 @@ test_expect_success 'merge-msg test #1' '
 '
 
 cat >expected <<EOF
-Merge branch 'left' of ../$test
+Merge branch 'left' of $TEST_DIRECTORY/$test
 EOF
 
 test_expect_success 'merge-msg test #2' '
 
        git checkout master &&
-       git fetch ../"$test" left &&
+       git fetch "$TEST_DIRECTORY/$test" left &&
 
        git fmt-merge-msg <.git/FETCH_HEAD >actual &&
        test_cmp expected actual