1 files changed, 52 insertions, 0 deletions
diff --git a/libcxx/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.members/increment.pass.cpp b/libcxx/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.members/increment.pass.cpp
new file mode 100644
index 00000000000..323bf8bfe45
--- /dev/null
+++ b/libcxx/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.members/increment.pass.cpp
@@ -0,0 +1,52 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
+// <chrono>
+// class day;
+
+//  constexpr day& operator++() noexcept;
+//  constexpr day operator++(int) noexcept;
+
+
+#include <chrono>
+#include <type_traits>
+#include <cassert>
+
+#include "test_macros.h"
+
+template <typename D>
+constexpr bool testConstexpr()
+{
+    D d1{1};
+    if (static_cast<unsigned>(++d1) != 2) return false;
+    if (static_cast<unsigned>(d1++) != 2) return false;
+    if (static_cast<unsigned>(d1)   != 3) return false;
+    return true;
+}
+
+int main()
+{
+    using day = std::chrono::day;
+    ASSERT_NOEXCEPT(++(std::declval<day&>())  );
+    ASSERT_NOEXCEPT(  (std::declval<day&>())++);
+
+    ASSERT_SAME_TYPE(day , decltype(  std::declval<day&>()++));
+    ASSERT_SAME_TYPE(day&, decltype(++std::declval<day&>()  ));
+    
+    static_assert(testConstexpr<day>(), "");
+
+    for (unsigned i = 10; i <= 20; ++i)
+    {
+        day day(i);
+        assert(static_cast<unsigned>(++day) == i + 1);
+        assert(static_cast<unsigned>(day++) == i + 1);
+        assert(static_cast<unsigned>(day)   == i + 2);
+    }
+}