1 files changed, 51 insertions, 0 deletions
diff --git a/libcxx/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/underflow.pass.cpp b/libcxx/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/underflow.pass.cpp
new file mode 100644
index 00000000000..1b16a37aaf0
--- /dev/null
+++ b/libcxx/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/underflow.pass.cpp
@@ -0,0 +1,51 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <strstream>
+
+// class strstreambuf
+
+// int_type underflow();
+
+#include <strstream>
+#include <cassert>
+
+struct test
+    : public std::strstreambuf
+{
+    typedef std::strstreambuf base;
+    test(char* gnext_arg, std::streamsize n, char* pbeg_arg = 0)
+        : base(gnext_arg, n, pbeg_arg) {}
+    test(const char* gnext_arg, std::streamsize n)
+        : base(gnext_arg, n) {}
+
+    base::int_type underflow() {return base::underflow();}
+};
+
+int main()
+{
+    {
+        char buf[10] = "123";
+        test sb(buf, 0, buf + 3);
+        assert(sb.underflow() == '1');
+        assert(sb.underflow() == '1');
+        assert(sb.snextc() == '2');
+        assert(sb.underflow() == '2');
+        assert(sb.underflow() == '2');
+        assert(sb.snextc() == '3');
+        assert(sb.underflow() == '3');
+        assert(sb.underflow() == '3');
+        assert(sb.snextc() == EOF);
+        assert(sb.underflow() == EOF);
+        assert(sb.underflow() == EOF);
+        sb.sputc('4');
+        assert(sb.underflow() == '4');
+        assert(sb.underflow() == '4');
+    }
+}