Squashed 'third_party/git/' content from commit cb71568594

git-subtree-dir: third_party/git
git-subtree-split: cb715685942260375e1eb8153b0768a376e4ece7

1 files changed, 41 insertions, 0 deletions

diff --git a/t/lib-read-tree.sh b/t/lib-read-tree.sh
new file mode 100644
index 000000000000..b95f4856061d
--- /dev/null
+++ b/t/lib-read-tree.sh
@@ -0,0 +1,41 @@
+# Helper functions to check if read-tree would succeed/fail as expected with
+# and without the dry-run option. They also test that the dry-run does not
+# write the index and that together with -u it doesn't touch the work tree.
+#
+read_tree_must_succeed () {
+	git ls-files -s >pre-dry-run &&
+	git read-tree -n "$@" &&
+	git ls-files -s >post-dry-run &&
+	test_cmp pre-dry-run post-dry-run &&
+	git read-tree "$@"
+}
+
+read_tree_must_fail () {
+	git ls-files -s >pre-dry-run &&
+	test_must_fail git read-tree -n "$@" &&
+	git ls-files -s >post-dry-run &&
+	test_cmp pre-dry-run post-dry-run &&
+	test_must_fail git read-tree "$@"
+}
+
+read_tree_u_must_succeed () {
+	git ls-files -s >pre-dry-run &&
+	git diff-files -p >pre-dry-run-wt &&
+	git read-tree -n "$@" &&
+	git ls-files -s >post-dry-run &&
+	git diff-files -p >post-dry-run-wt &&
+	test_cmp pre-dry-run post-dry-run &&
+	test_cmp pre-dry-run-wt post-dry-run-wt &&
+	git read-tree "$@"
+}
+
+read_tree_u_must_fail () {
+	git ls-files -s >pre-dry-run &&
+	git diff-files -p >pre-dry-run-wt &&
+	test_must_fail git read-tree -n "$@" &&
+	git ls-files -s >post-dry-run &&
+	git diff-files -p >post-dry-run-wt &&
+	test_cmp pre-dry-run post-dry-run &&
+	test_cmp pre-dry-run-wt post-dry-run-wt &&
+	test_must_fail git read-tree "$@"
+}