text: // Copyright (c) 2010 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.
  //
  // Unit tests for event trace provider.
  #include "base/win/event_trace_provider.h"
  #include <new>
  #include "testing/gtest/include/gtest/gtest.h"
  
  #include <initguid.h>  // NOLINT - has to be last
  
  namespace {
  
  using base::win::EtwMofEvent;
  using base::win::EtwTraceProvider;
  
  // clang-format off
  // {7F0FD37F-FA3C-4cd6-9242-DF60967A2CB2}
  DEFINE_GUID(kTestProvider,
    0x7f0fd37f, 0xfa3c, 0x4cd6, 0x92, 0x42, 0xdf, 0x60, 0x96, 0x7a, 0x2c, 0xb2);
  // clang-format on
  
  // clang-format off
  // {7F0FD37F-FA3C-4cd6-9242-DF60967A2CB2}
  DEFINE_GUID(kTestEventClass,
    0x7f0fd37f, 0xfa3c, 0x4cd6, 0x92, 0x42, 0xdf, 0x60, 0x96, 0x7a, 0x2c, 0xb2);
  // clang-format on
  
  }  // namespace
  
  TEST(EtwTraceProviderTest, ToleratesPreCreateInvocations) {
    // Because the trace provider is used in logging, it's important that
    // it be possible to use static provider instances without regard to
    // whether they've been constructed or destructed.
    // The interface of the class is designed to tolerate this usage.
    char buf[sizeof(EtwTraceProvider)] = {0};
    EtwTraceProvider& provider = reinterpret_cast<EtwTraceProvider&>(buf);
  
    EXPECT_EQ(0u, provider.registration_handle());
    EXPECT_EQ(0u, provider.session_handle());
    EXPECT_EQ(0u, provider.enable_flags());
    EXPECT_EQ(0u, provider.enable_level());
  
    EXPECT_FALSE(provider.ShouldLog(TRACE_LEVEL_FATAL, 0xfffffff));
  
    // We expect these not to crash.
    provider.Log(kTestEventClass, 0, TRACE_LEVEL_FATAL, "foo");
    provider.Log(kTestEventClass, 0, TRACE_LEVEL_FATAL, L"foo");
  
    EtwMofEvent<1> dummy(kTestEventClass, 0, TRACE_LEVEL_FATAL);
    DWORD data = 0;
    dummy.SetField(0, sizeof(data), &data);
    provider.Log(dummy.get());
  
    // Placement-new the provider into our buffer.
    new (buf) EtwTraceProvider(kTestProvider);
  
    // Registration is now safe.
    EXPECT_EQ(static_cast<ULONG>(ERROR_SUCCESS), provider.Register());
  
    // Destruct the instance, this should unregister it.
    provider.EtwTraceProvider::~EtwTraceProvider();
  
    // And post-destruction, all of the above should still be safe.
    EXPECT_EQ(0u, provider.registration_handle());
    EXPECT_EQ(0u, provider.session_handle());
    EXPECT_EQ(0u, provider.enable_flags());
    EXPECT_EQ(0u, provider.enable_level());
  
    EXPECT_FALSE(provider.ShouldLog(TRACE_LEVEL_FATAL, 0xfffffff));
  
    // We expect these not to crash.
    provider.Log(kTestEventClass, 0, TRACE_LEVEL_FATAL, "foo");
    provider.Log(kTestEventClass, 0, TRACE_LEVEL_FATAL, L"foo");
    provider.Log(dummy.get());
  }
  
  TEST(EtwTraceProviderTest, Initialize) {
    EtwTraceProvider provider(kTestProvider);
  
    EXPECT_EQ(0u, provider.registration_handle());
    EXPECT_EQ(0u, provider.session_handle());
    EXPECT_EQ(0u, provider.enable_flags());
    EXPECT_EQ(0u, provider.enable_level());
  }
  
  TEST(EtwTraceProviderTest, Register) {
    EtwTraceProvider provider(kTestProvider);
  
    ASSERT_EQ(static_cast<ULONG>(ERROR_SUCCESS), provider.Register());
    EXPECT_NE(0u, provider.registration_handle());
    ASSERT_EQ(static_cast<ULONG>(ERROR_SUCCESS), provider.Unregister());
    EXPECT_EQ(0u, provider.registration_handle());
  }
  
  TEST(EtwTraceProviderTest, RegisterWithNoNameFails) {
    EtwTraceProvider provider;
  
    EXPECT_TRUE(provider.Register() != ERROR_SUCCESS);
  }
  
  TEST(EtwTraceProviderTest, Enable) {
    EtwTraceProvider provider(kTestProvider);
  
    ASSERT_EQ(static_cast<ULONG>(ERROR_SUCCESS), provider.Register());
    EXPECT_NE(0u, provider.registration_handle());
  
    // No session so far.
    EXPECT_EQ(0u, provider.session_handle());
    EXPECT_EQ(0u, provider.enable_flags());
    EXPECT_EQ(0u, provider.enable_level());
  
    ASSERT_EQ(static_cast<ULONG>(ERROR_SUCCESS), provider.Unregister());
    EXPECT_EQ(0u, provider.registration_handle());
  }
  