in TeamCity.ServiceMessages/Write/Special/Impl/Writer/TeamCityTestWriter.cs [84:88]
public void WriteValue(double value, string name)
{
if (string.IsNullOrEmpty(name)) throw new ArgumentException(nameof(name));
PostMessage(new ServiceMessage("testMetadata") {{"testName", _testName}, {"type", "number"}, {"value", value.ToString(CultureInfo.InvariantCulture)}, {"name", name}});
}