From c4525063b04596175d25177583ce1655791cbc0f Mon Sep 17 00:00:00 2001
From: Neil <nyamatongwe@gmail.com>
Date: Thu, 16 Mar 2017 10:16:39 +1100
Subject: Fix use-after-free in fold tags when top line folded then new top
 line inserted. In SparseVector, string inserted at start then NULL inserted
 at start.

---
 test/unit/testSparseVector.cxx | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'test/unit/testSparseVector.cxx')

diff --git a/test/unit/testSparseVector.cxx b/test/unit/testSparseVector.cxx
index 11960163e..e0db7d094 100644
--- a/test/unit/testSparseVector.cxx
+++ b/test/unit/testSparseVector.cxx
@@ -89,6 +89,18 @@ TEST_CASE("SparseVector") {
 		st.Check();
 	}
 
+	SECTION("InsertStringAtStartThenInsertSpaceAtStart") {
+		REQUIRE(1 == st.Elements());
+		st.InsertSpace(0, 5);
+		st.SetValueAt(0, "3");
+		REQUIRE(1 == st.Elements());
+		REQUIRE("3----" == Representation(st));
+		st.InsertSpace(0, 1);
+		REQUIRE(2 == st.Elements());
+		REQUIRE("-3----" == Representation(st));
+		st.Check();
+	}
+
 	SECTION("InsertAndDeleteAtEnd") {
 		REQUIRE(1 == st.Elements());
 		st.InsertSpace(0, 5);
-- 
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