1 files changed, 83 insertions, 0 deletions
diff --git a/test/std/numerics/rand/rand.device/ctor.pass.cpp b/test/std/numerics/rand/rand.device/ctor.pass.cpp
new file mode 100644
index 000000000000..97f46b26aa27
--- /dev/null
+++ b/test/std/numerics/rand/rand.device/ctor.pass.cpp
@@ -0,0 +1,83 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <random>
+
+// class random_device;
+
+// explicit random_device(const string& token = implementation-defined);
+
+// For the following ctors, the standard states: "The semantics and default
+// value of the token parameter are implementation-defined". Implementations
+// therefore aren't required to accept any string, but the default shouldn't
+// throw.
+
+#include <random>
+#include <cassert>
+#include <unistd.h>
+
+bool is_valid_random_device(const std::string &token) {
+#if defined(_LIBCPP_USING_DEV_RANDOM)
+  // Not an exhaustive list: they're the only tokens that are tested below.
+  return token == "/dev/urandom" || token == "/dev/random";
+#else
+  return token == "/dev/urandom";
+#endif
+}
+
+void check_random_device_valid(const std::string &token) {
+  std::random_device r(token);
+}
+
+void check_random_device_invalid(const std::string &token) {
+  try {
+    std::random_device r(token);
+    assert(false);
+  } catch (const std::system_error &e) {
+  }
+}
+
+int main() {
+  { std::random_device r; }
+
+  {
+    int ec;
+    ec = close(STDIN_FILENO);
+    assert(!ec);
+    ec = close(STDOUT_FILENO);
+    assert(!ec);
+    ec = close(STDERR_FILENO);
+    assert(!ec);
+    std::random_device r;
+  }
+
+  {
+    std::string token = "wrong file";
+    if (is_valid_random_device(token))
+      check_random_device_valid(token);
+    else
+      check_random_device_invalid(token);
+  }
+
+  {
+    std::string token = "/dev/urandom";
+    if (is_valid_random_device(token))
+      check_random_device_valid(token);
+    else
+      check_random_device_invalid(token);
+  }
+
+  {
+    std::string token = "/dev/random";
+    if (is_valid_random_device(token))
+      check_random_device_valid(token);
+    else
+      check_random_device_invalid(token);
+  }
+}