Adds support for the DHCP portion of the WPAD (proxy auto-discovery) protocol.

net/proxy/dhcp_proxy_script_fetcher_factory_unittest.cc

+// Copyright (c) 2011 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 "net/proxy/dhcp_proxy_script_fetcher.h"
+#include "net/proxy/dhcp_proxy_script_fetcher_factory.h"
+#include "net/url_request/url_request_test_util.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace net {
+namespace {
+
+// Test harness that does nothing but restore previous value to the

[eroman, 2011/05/13 05:03:32]

I appreciate the thoroughness of testing. But in truth I would have have
suggested omitting this.

[Jói, 2011/05/13 20:19:09]

This is just so that these unit tests can't interfere with other tests;
modifying global state in a unit test and not restoring it does not seem kosher
to me.

+// DhcpProxyScriptFetcherFactory::feature_enabled_ flag.
+class DhcpProxyScriptFetcherFactoryTest : public testing::Test {
+ public:
+  virtual void SetUp() OVERRIDE {
+    original_feature_enabled_ = DhcpProxyScriptFetcherFactory::IsEnabled();
+  }
+
+  virtual void TearDown() OVERRIDE {
+    DhcpProxyScriptFetcherFactory::SetEnabled(original_feature_enabled_);
+  }
+
+ private:
+  bool original_feature_enabled_;
+};
+
+TEST_F(DhcpProxyScriptFetcherFactoryTest, DoNothingWhenDisabled) {
+  DhcpProxyScriptFetcherFactory::SetEnabled(false);
+  // Non-do-nothing fetchers would DCHECK on the NULL pointer.
+  DhcpProxyScriptFetcher* fetcher = DhcpProxyScriptFetcherFactory::Create(NULL);
+  ASSERT_TRUE(fetcher);
+  EXPECT_EQ("", fetcher->GetFetcherName());
+}
+
+#if defined(OS_WIN)
+TEST_F(DhcpProxyScriptFetcherFactoryTest, WindowsFetcherOnWindows) {
+  DhcpProxyScriptFetcherFactory::SetEnabled(true);
+
+  scoped_refptr<TestURLRequestContext> context(new TestURLRequestContext());
+  DhcpProxyScriptFetcher* fetcher =
+      DhcpProxyScriptFetcherFactory::Create(context);
+  ASSERT_TRUE(fetcher);
+  EXPECT_EQ("win", fetcher->GetFetcherName());
+}
+#endif  // defined(OS_WIN)
+
+TEST_F(DhcpProxyScriptFetcherFactoryTest, IsSupported) {
+#if defined(OS_WIN)
+  ASSERT_TRUE(DhcpProxyScriptFetcherFactory::IsSupported());
+#else
+  ASSERT_FALSE(DhcpProxyScriptFetcherFactory::IsSupported());
+#endif  // defined(OS_WIN)
+}
+
+TEST_F(DhcpProxyScriptFetcherFactoryTest, SetEnabled) {
+  EXPECT_FALSE(DhcpProxyScriptFetcherFactory::IsEnabled());
+
+  DhcpProxyScriptFetcherFactory::SetEnabled(false);
+  EXPECT_FALSE(DhcpProxyScriptFetcherFactory::IsEnabled());
+
+  DhcpProxyScriptFetcherFactory::SetEnabled(true);
+#if defined(OS_WIN)
+  EXPECT_TRUE(DhcpProxyScriptFetcherFactory::IsEnabled());
+#else
+  EXPECT_FALSE(DhcpProxyScriptFetcherFactory::IsEnabled());
+#endif  // defined(OS_WIN)
+}
+
+}  // namespace
+}  // namespace net