Clear environment variables for nacl_helper

components/nacl/zygote/nacl_fork_delegate_linux_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 "components/nacl/zygote/nacl_fork_delegate_linux.h"
+
+#include "base/environment.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/process/launch.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+TEST(NaClForkDelegateLinuxTest, EnvPassthrough) {
+  scoped_ptr<base::Environment> env(base::Environment::Create());
+  const char passthrough1[] = "HELPER_PASSTHROUGH1";
+  const char passthrough2[] = "HELPER_PASSTHROUGH2";
+  const char passthrough3[] = "HELPER_PASSTHROUGH3";
+  const char passthrough4[] = "HELPER_PASSTHROUGH4";
+  const char passthrough5[] = "NACL_EXE_STDOUT";
+  const char value1[] = "passthrough_value1";
+  const char value3[] = "passthrough_value3";
+  const char value4[] = "passthrough_value4";
+  const char value5[] = "passthrough_value5";
+  std::string passthrough_value;
+  passthrough_value += passthrough1;
+  passthrough_value += ",";
+  passthrough_value += passthrough2;
+  passthrough_value += ",";
+  passthrough_value += passthrough3;
+  // Not adding passthrough4 to the passthrough variable.
+  // Not adding passthrough5 either because it is implicitly allowed.
+  env->SetVar("NACL_ENV_PASSTHROUGH", passthrough_value.c_str());
+  env->SetVar(passthrough1, value1);
+  // Intentionally skip setting a value for passthrough2.
+  env->SetVar(passthrough3, value3);
+  env->SetVar(passthrough4, value4);
+  env->SetVar(passthrough5, value5);
+
+  base::LaunchOptions options;
+  nacl::NaClForkDelegate::AddPassthroughEnvToOptions(options);
+  EXPECT_EQ(value1, options.environ[passthrough1]);
+  EXPECT_EQ(0U, options.environ.count(passthrough2));
+  EXPECT_EQ(value3, options.environ[passthrough3]);
+  EXPECT_EQ(0U, options.environ.count(passthrough4));
+  EXPECT_EQ(value5, options.environ[passthrough5]);
+}