"sage -testall" has at least three parts (DSage unit tests, documentation doctests, library doctests). If some documentation doctests fail, you have to know to look in the middle of the -testall output to notice; the end of the output may well say that all tests passed (meaning all library doctests).

CC: @garyfurnish @orlitzky

Component: doctest coverage

Reviewer: Michael Orlitzky

Issue created by migration from https://trac.sagemath.org/ticket/879