The minimal test reporter provides the absolutely minimum amount of information: whether each expectation has succeeded, failed or experienced an error. If you want to find out what the failures and errors actually were, you'll need to run a more informative test reporter.
Other reporters:
CheckReporter,
DebugReporter,
FailReporter,
JunitReporter,
ListReporter,
LocationReporter,
MultiReporter,
ProgressReporter,
RStudioReporter,
Reporter,
SilentReporter,
StopReporter,
SummaryReporter,
TapReporter,
TeamcityReporter