add undo unit_test and fix Buffer

1 files changed, 9 insertions, 0 deletions

diff --git a/src/unit_tests.cc b/src/unit_tests.cc
index 0793eedc..5e91de03 100644
--- a/src/unit_tests.cc
+++ b/src/unit_tests.cc
@@ -38,6 +38,15 @@ void test_buffer()
     begin = buffer.end() - 1;
     buffer.insert(buffer.end(), "kanaky\n");
     assert(buffer.string(begin+1, buffer.end()) == "kanaky\n");
+
+    buffer.end_undo_group();
+
+    buffer.begin_undo_group();
+    buffer.erase(begin+1, buffer.end());
+    buffer.insert(buffer.end(), "mutch\n");
+    buffer.end_undo_group();
+    buffer.undo();
+    assert(buffer.string(buffer.end() - 7, buffer.end()) == "kanaky\n");
 }
 
 void test_editor()