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/utilities/memory/unique.ptr/unique.ptr.runtime/null_asgn.pass.cpp

@@ -0,0 +1,41 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <memory>
+
+// unique_ptr
+
+// Test unique_ptr move assignment
+
+#include <memory>
+#include <cassert>
+
+// test assignment from null
+
+struct A
+{
+    static int count;
+    A() {++count;}
+    A(const A&) {++count;}
+    ~A() {--count;}
+};
+
+int A::count = 0;
+
+int main()
+{
+    {
+    std::unique_ptr<A> s2(new A);
+    assert(A::count == 1);
+    s2 = 0;
+    assert(A::count == 0);
+    assert(s2.get() == 0);
+    }
+    assert(A::count == 0);
+}