Variable *VERBOSE-FAILURES* T if we should print the expression failing, NIL otherwise.
Just as important as defining and runnig the tests is
understanding the results. FiveAM provides the function EXPLAIN
which prints a human readable summary (number passed, number
failed, what failed and why, etc.) of a list of test results.
Method (EXPLAIN DETAILED-TEXT-EXPLAINER T)
Method (EXPLAIN SIMPLE-TEXT-EXPLAINER T)