[PATCH] Add a test for subtree rebase that loses commits

[David Greene <greened@obbligato.org>]

From: "David A. Greene" <greened@obbligato.org>

This test merges an external tree in as a subtree, makes some commits
on top of it and splits it back out.  In the process the added commits
are lost.  This is marked to expect failure so that we don't forget to
fix it.

Signed-off-by: David A. Greene <greened@obbligato.org>
---
 t/t3427-rebase-subtree.sh | 68 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100755 t/t3427-rebase-subtree.sh

diff --git a/t/t3427-rebase-subtree.sh b/t/t3427-rebase-subtree.sh
new file mode 100755
index 0000000..7eb28ab
--- /dev/null
+++ b/t/t3427-rebase-subtree.sh
@@ -0,0 +1,68 @@
+#!/bin/sh
+
+test_description='git rebase tests for -Xsubtree
+
+This test runs git rebase and tests the subtree strategy.
+'
+. ./test-lib.sh
+
+addfile() {
+    name=$1
+    echo $(basename ${name}) > ${name}
+    ${git} add ${name}
+    ${git} commit -m "Add $(basename ${name})"
+}
+
+check_equal()
+{
+	test_debug 'echo'
+	test_debug "echo \"check a:\" \"{$1}\""
+	test_debug "echo \"      b:\" \"{$2}\""
+	if [ "$1" = "$2" ]; then
+		return 0
+	else
+		return 1
+	fi
+}
+
+last_commit_message()
+{
+	git log --pretty=format:%s -1
+}
+
+test_expect_success 'setup' '
+	test_commit README &&
+	mkdir files &&
+	cd files &&
+	git init &&
+	test_commit master1 &&
+	test_commit master2 &&
+	test_commit master3 &&
+	cd .. &&
+	test_debug "echo Add project master to master" &&
+	git fetch files master &&
+	git branch files-master FETCH_HEAD &&
+	test_debug "echo Add subtree master to master via subtree" &&
+	git read-tree --prefix=files_subtree files-master &&
+	git checkout -- files_subtree &&
+	tree=$(git write-tree) &&
+	head=$(git rev-parse HEAD) &&
+	rev=$(git rev-parse --verify files-master^0) &&
+	commit=$(git commit-tree -p ${head} -p ${rev} -m "Add subproject master" ${tree}) &&
+	git reset ${commit} &&
+	cd files_subtree &&
+	test_commit master4 &&
+	cd .. &&
+	test_commit files_subtree/master5
+'
+
+# Does not preserve master4 and master5.
+test_expect_failure 'Rebase default' '
+	git checkout -b rebase-default master &&
+	git filter-branch --prune-empty -f --subdirectory-filter files_subtree &&
+	git commit -m "Empty commit" --allow-empty &&
+	git rebase -Xsubtree=files_subtree  --preserve-merges --onto files-master master &&
+	check_equal "$(last_commit_message)" "files_subtree/master5"
+'
+
+test_done
-- 
2.6.1