Add domain-specific language for BPF policies

sandbox/linux/bpf_dsl/cons_unittest.cc

+// Copyright 2014 The Chromium 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 "sandbox/linux/bpf_dsl/cons.h"
+
+#include <string>
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace sandbox {
+namespace {
+
+std::string Join(Cons<char>::List char_list) {
+  std::string res;
+  for (Cons<char>::List it = char_list; it; it = it->tail()) {
+    res.push_back(it->head());
+  }
+  return res;
+}
+
+TEST(ConsListTest, Basic) {
+  Cons<char>::List ba =
+      Cons<char>::Make('b', Cons<char>::Make('a', Cons<char>::List()));
+  EXPECT_EQ("ba", Join(ba));
+
+  Cons<char>::List cba = Cons<char>::Make('c', ba);
+  Cons<char>::List dba = Cons<char>::Make('d', ba);
+  EXPECT_EQ("cba", Join(cba));
+  EXPECT_EQ("dba", Join(dba));
+}
+
+}  // namespace
+}  // namespace sandbox