checkout: add basic tests for detached-orphan warning

Commit 8e2dc6ac added a warning when we leave a detached
HEAD whose commit is not reachable from any ref tip. Let's
add a few basic tests to make sure it works.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t2020-checkout-detach.sh b/t/t2020-checkout-detach.sh
index 00421453ba26327b929fa7b5133a3072fce2bb03..bfeb2a65129a7d573a311037c923ae92d6d97f22 100755 (executable)
--- a/t/t2020-checkout-detach.sh
+++ b/t/t2020-checkout-detach.sh
@@ -11,6 +11,14 @@ check_not_detached () {
        git symbolic-ref -q HEAD >/dev/null
 }
 
+ORPHAN_WARNING='you are leaving .* commit.*behind'
+check_orphan_warning() {
+       grep "$ORPHAN_WARNING" "$1"
+}
+check_no_orphan_warning() {
+       ! grep "$ORPHAN_WARNING" "$1"
+}
+
 reset () {
        git checkout master &&
        check_not_detached
@@ -19,6 +27,8 @@ reset () {
 test_expect_success 'setup' '
        test_commit one &&
        test_commit two &&
+       test_commit three && git tag -d three &&
+       test_commit four && git tag -d four &&
        git branch branch &&
        git tag tag
 '
@@ -92,4 +102,28 @@ test_expect_success 'checkout --detach moves HEAD' '
        git diff --exit-code two
 '
 
+test_expect_success 'checkout warns on orphan commits' '
+       reset &&
+       git checkout --detach two &&
+       echo content >orphan &&
+       git add orphan &&
+       git commit -a -m orphan &&
+       git checkout master 2>stderr &&
+       check_orphan_warning stderr
+'
+
+test_expect_success 'checkout does not warn leaving ref tip' '
+       reset &&
+       git checkout --detach two &&
+       git checkout master 2>stderr &&
+       check_no_orphan_warning stderr
+'
+
+test_expect_success 'checkout does not warn leaving reachable commit' '
+       reset &&
+       git checkout --detach HEAD^ &&
+       git checkout master 2>stderr &&
+       check_no_orphan_warning stderr
+'
+
 test_done