Add SmallString test trying to exercise the realloc() code path

by allocating a small size (will go through malloc) and then large size.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@244637 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/unittests/ADT/SmallStringTest.cpp b/unittests/ADT/SmallStringTest.cpp
index 9398e99c91193a8199dde8bb08d00dcebec3e908..995ef8e812781f9c76a701dd2bf49fe086e61011 100644 (file)
--- a/unittests/ADT/SmallStringTest.cpp
+++ b/unittests/ADT/SmallStringTest.cpp
@@ -159,6 +159,17 @@ TEST_F(SmallStringTest, Count) {
   EXPECT_EQ(0U, theString.count("zz"));
 }
 
+TEST_F(SmallStringTest, Realloc) {
+  theString = "abcd";
+  theString.reserve(100);
+  EXPECT_EQ("abcd", theString);
+  unsigned const N = 100000;
+  theString.reserve(N);
+  for (unsigned i = 0; i < N - 4; ++i)
+    theString.push_back('y');
+  EXPECT_EQ("abcdyyy", theString.slice(0, 7));
+}
+
 TEST(StringRefTest, Comparisons) {
   EXPECT_EQ(-1, SmallString<10>("aab").compare("aad"));
   EXPECT_EQ( 0, SmallString<10>("aab").compare("aab"));