1 files changed, 38 insertions, 0 deletions
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.mod/member_swap.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.mod/member_swap.pass.cpp
new file mode 100644
index 000000000000..598d53a65c85
--- /dev/null
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.mod/member_swap.pass.cpp
@@ -0,0 +1,38 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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: libcpp-has-no-threads
+
+// <mutex>
+
+// template <class Mutex> class unique_lock;
+
+// void swap(unique_lock& u);
+
+#include <mutex>
+#include <cassert>
+
+struct mutex
+{
+    void lock() {}
+    void unlock() {}
+};
+
+mutex m;
+
+int main()
+{
+    std::unique_lock<mutex> lk1(m);
+    std::unique_lock<mutex> lk2;
+    lk1.swap(lk2);
+    assert(lk1.mutex() == nullptr);
+    assert(lk1.owns_lock() == false);
+    assert(lk2.mutex() == &m);
+    assert(lk2.owns_lock() == true);
+}