Printing additional output in Google Test

I'm using the googletest C++ testing framework. Normally the textual output of running a test looks like this:

[ RUN      ] MyTest.Fuzz
[       OK ] MyTest.Fuzz (1867 ms)

I would like to output some additional data in the same format, for example:

[ RUN      ] MyTest.Fuzz
[          ] random seed = 1319760587
[       OK ] MyTest.Fuzz (1867 ms)

I have found Logging Additional Information in the googletest documentation but that only seems to send structured data to the XML output, not the standard console output.

Is there a googletest function I can call inside my unit test that outputs text in this format? Manually sending data to cout works, but it doesn't include the usual coloured output so I have to explicitly indent the output by printing 13 spaces or whatever.

Simply printing to stderr will work in the default test configuration.

std::cerr << "[          ] random seed = " << random_seed << std::endl;

You could write a wrapper for the default printer PrettyUnitTestResultPrinter to also print out test properties. You can get the default printer with listeners.default_result_printer()(see below). You would have to implement EmptyTestEventListener and change the method PrettyUnitTestResultPrinter::OnTestEnd() (in gtest.cc) and use the results properties: test_info.result()->GetTestProperty(i) like the printer for XML output:

String XmlUnitTestResultPrinter::TestPropertiesAsXmlAttributes(
    const TestResult& result) {
  Message attributes;
  for (int i = 0; i < result.test_property_count(); ++i) {
    const TestProperty& property = result.GetTestProperty(i);
    attributes << " " << property.key() << "="
        << "\"" << EscapeXmlAttribute(property.value()) << "\"";
  }
  return attributes.GetString();
}

Then you can replace the default listener for your tests like it's done in the google test sample:

UnitTest& unit_test = *UnitTest::GetInstance();
if (terse_output) {
  TestEventListeners& listeners = unit_test.listeners();
  delete listeners.Release(listeners.default_result_printer());
  listeners.Append(new TersePrinter);
}
int ret_val = RUN_ALL_TESTS();