private TestServer <GraphSchema> CreateTestServer(out TestLogger logInstance)
{
// fake a logger with a single instance that will accept
// log entries from the run time so they can be validated in the test.
logInstance = new TestLogger();
var builder = new TestServerBuilder();
builder.AddGraphType <LogTestController>();
builder.AddGraphQLLocalQueryCache();
builder.Logging.AddLoggerProvider(new TestLoggingProvider(logInstance));
builder.Logging.SetMinimumLogLevel(LogLevel.Trace);
return(builder.Build());
}