The msgasserted() function in util/assert_util.cpp uses tlog() to log messages instead of log(). Because tlogLevel is set to -1 in dbtests/framework.cpp, this suppresses all messages describing the cause of assertions thrown by the 'test' program. It does, however, display stack traces to 'cout', so we get stack traces with no explanation in the output of 'test'. The 'test' logs would be easier to interpret if we could see the reason for the stack traces.
Changing 'tlog()' to 'log()' in msgasserted() would fix this.