FIX: Fix log tests on macOS

Author: threecgreen

test/src/log_tests.cpp

@@ -1,6 +1,7 @@
 #include <gtest/gtest.h>
 
 #include <iostream>
+#include <ostream>
 #include <string>
 
 #include "databento/log.hpp"
@@ -9,37 +10,29 @@ namespace databento {
 namespace test {
 class ConsoleLogReceiverTests : public testing::Test {
  protected:
-  ConsoleLogReceiver target_{};
+  std::ostringstream stream_{};
+  ConsoleLogReceiver target_{stream_};
 };
 
 TEST_F(ConsoleLogReceiverTests, TestOutput) {
-  testing::internal::CaptureStderr();
   const std::string msg = "Something went wrong";
   target_.Receive(LogLevel::Warning, msg);
-  std::clog.flush();
-  const std::string output = testing::internal::GetCapturedStderr();
+  const std::string output = stream_.str();
   // ConsoleLogReceiver adds newline
   ASSERT_EQ(msg + '\n', output);
 }
 
 TEST_F(ConsoleLogReceiverTests, TestFilter) {
-  testing::internal::CaptureStderr();
   const std::string msg = "Something happened";
   target_.Receive(LogLevel::Debug, msg);
-  std::clog.flush();
-  const std::string output = testing::internal::GetCapturedStderr();
+  const std::string output = stream_.str();
   ASSERT_TRUE(output.empty());
 }
 
 TEST(ILogReceiverTests, TestDefault) {
   auto* log_receiver = ILogReceiver::Default();
   ASSERT_NE(log_receiver, nullptr);
   ASSERT_NE(dynamic_cast<ConsoleLogReceiver*>(log_receiver), nullptr);
-  testing::internal::CaptureStderr();
-  const std::string msg = "Fatal error";
-  log_receiver->Receive(LogLevel::Error, msg);
-  const std::string output = testing::internal::GetCapturedStderr();
-  ASSERT_EQ(msg + '\n', output);
 }
 }  // namespace test
 }  // namespace databento