1 files changed, 33 insertions, 0 deletions
diff --git a/libcxx/test/std/utilities/time/time.duration/time.duration.arithmetic/op_-.pass.cpp b/libcxx/test/std/utilities/time/time.duration/time.duration.arithmetic/op_-.pass.cpp
new file mode 100644
index 00000000000..00da6f69ca5
--- /dev/null
+++ b/libcxx/test/std/utilities/time/time.duration/time.duration.arithmetic/op_-.pass.cpp
@@ -0,0 +1,33 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <chrono>
+
+// duration
+
+// duration operator-() const;
+
+#include <chrono>
+#include <cassert>
+
+int main()
+{
+    {
+    const std::chrono::minutes m(3);
+    std::chrono::minutes m2 = -m;
+    assert(m2.count() == -m.count());
+    }
+#ifndef _LIBCPP_HAS_NO_CONSTEXPR
+    {
+    constexpr std::chrono::minutes m(3);
+    constexpr std::chrono::minutes m2 = -m;
+    static_assert(m2.count() == -m.count(), "");
+    }
+#endif
+}