Move test into test/std subdirectory.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@224658 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle_rand.pass.cpp

@@ -0,0 +1,37 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <algorithm>
+
+// template<RandomAccessIterator Iter, Callable<auto, Iter::difference_type> Rand>
+//   requires ShuffleIterator<Iter>
+//         && Convertible<Rand::result_type, Iter::difference_type>
+//   void
+//   random_shuffle(Iter first, Iter last, Rand&& rand);
+
+#include <algorithm>
+#include <cassert>
+
+struct gen
+{
+    int operator()(int n)
+    {
+        return n-1;
+    }
+};
+
+int main()
+{
+    int ia[] = {1, 2, 3, 4};
+    int ia1[] = {4, 1, 2, 3};
+    const unsigned sa = sizeof(ia)/sizeof(ia[0]);
+    gen r;
+    std::random_shuffle(ia, ia+sa, r);
+    assert(std::equal(ia, ia+sa, ia1));
+}