Added simplest device mount implementation (includes NullDevice and RandomDevice)

libraries/nacl-mounts/test/DevMountTest.cc

+/*
+ * Copyright (c) 2011 The Native Client Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "../dev/DevMount.h"
+#include "gtest/gtest.h"
+
+TEST(DevMountTest, Sanity) {
+  DevMount* bm = new DevMount();
+
+  // just make sure all of the calls run
+  struct stat st;
+  struct dirent dir;
+  EXPECT_EQ(bm->GetNode("/", &st), 0);
+  EXPECT_EQ(0, bm->Stat(1, &st));
+  EXPECT_EQ(1, S_ISDIR(st.st_mode));
+  EXPECT_GT(bm->Getdents(1, 0, &dir, 1024), 1);
+  bm->GetNode("/null", &st);
+  int node = st.st_ino;
+  char buf[10];
+  EXPECT_EQ(5, bm->Write(node, 0, reinterpret_cast<void*>(buf), 5));
+  EXPECT_EQ(0, bm->Isatty(0));
+}
+