1 files changed, 60 insertions, 0 deletions
diff --git a/libcxx/test/std/utilities/time/time.hms/time.hms.members/to_duration.pass.cpp b/libcxx/test/std/utilities/time/time.hms/time.hms.members/to_duration.pass.cpp
new file mode 100644
index 00000000000..6bc62af6a29
--- /dev/null
+++ b/libcxx/test/std/utilities/time/time.hms/time.hms.members/to_duration.pass.cpp
@@ -0,0 +1,60 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
+// <chrono>
+
+// template <class Duration>
+// class hh_mm_ss
+// 
+// constexpr precision to_duration() const noexcept;
+//
+// See the table in hours.pass.cpp for correspondence between the magic values used below
+
+#include <chrono>
+#include <cassert>
+
+#include "test_macros.h"
+
+template <typename Duration>
+constexpr long long check_duration(Duration d)
+{
+    using HMS = std::chrono::hh_mm_ss<Duration>;
+    ASSERT_SAME_TYPE(typename HMS::precision, decltype(std::declval<HMS>().to_duration()));
+    ASSERT_NOEXCEPT(                                   std::declval<HMS>().to_duration());
+    
+    return HMS(d).to_duration().count();
+}
+
+int main(int, char**)
+{
+    using microfortnights = std::chrono::duration<int, std::ratio<756, 625>>;
+    
+    static_assert( check_duration(std::chrono::minutes( 1)) ==  60, "");
+    static_assert( check_duration(std::chrono::minutes(-1)) == -60, "");
+
+    assert( check_duration(std::chrono::seconds( 5000)) ==    5000LL);
+    assert( check_duration(std::chrono::seconds(-5000)) ==   -5000LL);
+    assert( check_duration(std::chrono::minutes( 5000)) ==  300000LL);
+    assert( check_duration(std::chrono::minutes(-5000)) == -300000LL);
+    assert( check_duration(std::chrono::hours( 11))     ==   39600LL);
+    assert( check_duration(std::chrono::hours(-11))     ==  -39600LL);
+
+    assert( check_duration(std::chrono::milliseconds( 123456789LL)) ==  123456789LL);
+    assert( check_duration(std::chrono::milliseconds(-123456789LL)) == -123456789LL);
+    assert( check_duration(std::chrono::microseconds( 123456789LL)) ==  123456789LL);
+    assert( check_duration(std::chrono::microseconds(-123456789LL)) == -123456789LL);
+    assert( check_duration(std::chrono::nanoseconds( 123456789LL))  ==  123456789LL);
+    assert( check_duration(std::chrono::nanoseconds(-123456789LL))  == -123456789LL);
+
+    assert( check_duration(microfortnights(  1000)) ==   12096000);
+    assert( check_duration(microfortnights( -1000)) ==  -12096000);
+    assert( check_duration(microfortnights( 10000)) ==  120960000);
+    assert( check_duration(microfortnights(-10000)) == -120960000);
+
+    return 0;
+}