1 files changed, 55 insertions, 0 deletions
diff --git a/test/std/numerics/complex.number/cmplx.over/arg.pass.cpp b/test/std/numerics/complex.number/cmplx.over/arg.pass.cpp
new file mode 100644
index 0000000000000..978c6255ac38b
--- /dev/null
+++ b/test/std/numerics/complex.number/cmplx.over/arg.pass.cpp
@@ -0,0 +1,55 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <complex>
+
+// template<Arithmetic T>
+//   T
+//   arg(T x);
+
+#include <complex>
+#include <type_traits>
+#include <cassert>
+
+#include "../cases.h"
+
+template <class T>
+void
+test(T x, typename std::enable_if<std::is_integral<T>::value>::type* = 0)
+{
+    static_assert((std::is_same<decltype(std::arg(x)), double>::value), "");
+    assert(std::arg(x) == arg(std::complex<double>(x, 0)));
+}
+
+template <class T>
+void
+test(T x, typename std::enable_if<!std::is_integral<T>::value>::type* = 0)
+{
+    static_assert((std::is_same<decltype(std::arg(x)), T>::value), "");
+    assert(std::arg(x) == arg(std::complex<T>(x, 0)));
+}
+
+template <class T>
+void
+test()
+{
+    test<T>(0);
+    test<T>(1);
+    test<T>(10);
+}
+
+int main()
+{
+    test<float>();
+    test<double>();
+    test<long double>();
+    test<int>();
+    test<unsigned>();
+    test<long long>();
+}