Merge to upstream r225300.

Change-Id: I2b23715db9ac129ff80aa78ad5824db0a4d6fbb3

test/std/strings/basic.string/string.capacity/clear.pass.cpp

@@ -0,0 +1,57 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// void clear();
+
+#include <string>
+#include <cassert>
+
+#include "min_allocator.h"
+
+template <class S>
+void
+test(S s)
+{
+    s.clear();
+    assert(s.size() == 0);
+}
+
+int main()
+{
+    {
+    typedef std::string S;
+    S s;
+    test(s);
+
+    s.assign(10, 'a');
+    s.erase(5);
+    test(s);
+
+    s.assign(100, 'a');
+    s.erase(50);
+    test(s);
+    }
+#if __cplusplus >= 201103L
+    {
+    typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
+    S s;
+    test(s);
+
+    s.assign(10, 'a');
+    s.erase(5);
+    test(s);
+
+    s.assign(100, 'a');
+    s.erase(50);
+    test(s);
+    }
+#endif
+}