text: // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
  // for details. All rights reserved. Use of this source code is governed by a
  // BSD-style license that can be found in the LICENSE file.
  
  #include "platform/globals.h"
  
  #include "include/dart_tools_api.h"
  #include "vm/dart_api_impl.h"
  #include "vm/dart_entry.h"
  #include "vm/debugger.h"
  #include "vm/globals.h"
  #include "vm/isolate.h"
  #include "vm/log.h"
  #include "vm/message_handler.h"
  #include "vm/unit_test.h"
  
  namespace dart {
  
  static const char* test_output_ = NULL;
  
  static void TestPrinter(const char* buffer) {
    if (test_output_ != NULL) {
      free(const_cast<char*>(test_output_));
      test_output_ = NULL;
    }
    test_output_ = strdup(buffer);
  
    // Also print to stdout to see the overall result.
    OS::PrintErr("%s", test_output_);
  }
  
  class LogTestHelper : public AllStatic {
   public:
    static void SetPrinter(Log* log, LogPrinter printer) {
      ASSERT(log != NULL);
      ASSERT(printer != NULL);
      log->printer_ = printer;
    }
  
    static void FreeTestOutput() {
      if (test_output_ != NULL) {
        free(const_cast<char*>(test_output_));
        test_output_ = NULL;
      }
    }
  };
  
  TEST_CASE(Log_Macro) {
    test_output_ = NULL;
    Log* log = Log::Current();
    LogTestHelper::SetPrinter(log, TestPrinter);
  
    THR_Print("Hello %s", "World");
    EXPECT_STREQ("Hello World", test_output_);
    THR_Print("SingleArgument");
    EXPECT_STREQ("SingleArgument", test_output_);
    LogTestHelper::FreeTestOutput();
  }
  
  TEST_CASE(Log_Basic) {
    test_output_ = NULL;
    Log* log = new Log(TestPrinter);
  
    EXPECT_EQ(reinterpret_cast<const char*>(NULL), test_output_);
    log->Print("Hello %s", "World");
    EXPECT_STREQ("Hello World", test_output_);
  
    delete log;
    LogTestHelper::FreeTestOutput();
  }
  
  TEST_CASE(Log_Block) {
    test_output_ = NULL;
    Log* log = new Log(TestPrinter);
  
    EXPECT_EQ(reinterpret_cast<const char*>(NULL), test_output_);
    {
      LogBlock ba(thread, log);
      log->Print("APPLE");
      EXPECT_EQ(reinterpret_cast<const char*>(NULL), test_output_);
      {
        LogBlock ba(thread, log);
        log->Print("BANANA");
        EXPECT_EQ(reinterpret_cast<const char*>(NULL), test_output_);
      }
      EXPECT_EQ(reinterpret_cast<const char*>(NULL), test_output_);
      {
        LogBlock ba(thread, log);
        log->Print("PEAR");
        EXPECT_EQ(reinterpret_cast<const char*>(NULL), test_output_);
      }
      EXPECT_EQ(reinterpret_cast<const char*>(NULL), test_output_);
    }
    EXPECT_STREQ("APPLEBANANAPEAR", test_output_);
    delete log;
    LogTestHelper::FreeTestOutput();
  }
  
  }  // namespace dart
  