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-rwxr-xr-xt/t2020-checkout-detach.sh154
1 files changed, 154 insertions, 0 deletions
diff --git a/t/t2020-checkout-detach.sh b/t/t2020-checkout-detach.sh
new file mode 100755
index 0000000000..068fba4c8e
--- /dev/null
+++ b/t/t2020-checkout-detach.sh
@@ -0,0 +1,154 @@
+#!/bin/sh
+
+test_description='checkout into detached HEAD state'
+. ./test-lib.sh
+
+check_detached () {
+ test_must_fail git symbolic-ref -q HEAD >/dev/null
+}
+
+check_not_detached () {
+ git symbolic-ref -q HEAD >/dev/null
+}
+
+ORPHAN_WARNING='you are leaving .* commit.*behind'
+PREV_HEAD_DESC='Previous HEAD position was'
+check_orphan_warning() {
+ test_i18ngrep "$ORPHAN_WARNING" "$1" &&
+ test_i18ngrep ! "$PREV_HEAD_DESC" "$1"
+}
+check_no_orphan_warning() {
+ test_i18ngrep ! "$ORPHAN_WARNING" "$1" &&
+ test_i18ngrep "$PREV_HEAD_DESC" "$1"
+}
+
+reset () {
+ git checkout master &&
+ check_not_detached
+}
+
+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
+'
+
+test_expect_success 'checkout branch does not detach' '
+ reset &&
+ git checkout branch &&
+ check_not_detached
+'
+
+test_expect_success 'checkout tag detaches' '
+ reset &&
+ git checkout tag &&
+ check_detached
+'
+
+test_expect_success 'checkout branch by full name detaches' '
+ reset &&
+ git checkout refs/heads/branch &&
+ check_detached
+'
+
+test_expect_success 'checkout non-ref detaches' '
+ reset &&
+ git checkout branch^ &&
+ check_detached
+'
+
+test_expect_success 'checkout ref^0 detaches' '
+ reset &&
+ git checkout branch^0 &&
+ check_detached
+'
+
+test_expect_success 'checkout --detach detaches' '
+ reset &&
+ git checkout --detach branch &&
+ check_detached
+'
+
+test_expect_success 'checkout --detach without branch name' '
+ reset &&
+ git checkout --detach &&
+ check_detached
+'
+
+test_expect_success 'checkout --detach errors out for non-commit' '
+ reset &&
+ test_must_fail git checkout --detach one^{tree} &&
+ check_not_detached
+'
+
+test_expect_success 'checkout --detach errors out for extra argument' '
+ reset &&
+ git checkout master &&
+ test_must_fail git checkout --detach tag one.t &&
+ check_not_detached
+'
+
+test_expect_success 'checkout --detached and -b are incompatible' '
+ reset &&
+ test_must_fail git checkout --detach -b newbranch tag &&
+ check_not_detached
+'
+
+test_expect_success 'checkout --detach moves HEAD' '
+ reset &&
+ git checkout one &&
+ git checkout --detach two &&
+ git diff --exit-code 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
+'
+
+test_expect_success 'checkout warns on orphan commits: output' '
+ check_orphan_warning stderr
+'
+
+test_expect_success 'checkout does not warn leaving ref tip' '
+ reset &&
+ git checkout --detach two &&
+ git checkout master 2>stderr
+'
+
+test_expect_success 'checkout does not warn leaving ref tip' '
+ 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
+'
+
+test_expect_success 'checkout does not warn leaving reachable commit' '
+ check_no_orphan_warning stderr
+'
+
+cat >expect <<'EOF'
+Your branch is behind 'master' by 1 commit, and can be fast-forwarded.
+EOF
+test_expect_success 'tracking count is accurate after orphan check' '
+ reset &&
+ git branch child master^ &&
+ git config branch.child.remote . &&
+ git config branch.child.merge refs/heads/master &&
+ git checkout child^ &&
+ git checkout child >stdout &&
+ test_cmp expect stdout
+'
+
+test_done