Testing files:

  -t [options] <files|dir> -- test examples in .py, .pyx, .sage
                              or .tex files.  Options:
     --long           -- include lines with the phrase 'long time'
...
  --tox [options] <files|dirs> -- general entry point for testing
                                  and linting of the Sage library
     -e <envlist>     -- run specific test environments (default: run all)
        doctest          -- run the Sage doctester 
                            (same as "sage -t")
        coverage         -- give information about doctest coverage of files 
                            (same as "sage --coverage[all]")
        startuptime      -- display how long each component of Sage takes to start up 
                            (same as "sage --startuptime")
        pycodestyle      -- check against the Python style conventions of PEP8
        relint           -- check whether some forbidden patterns appear 
                            (includes all patchbot pattern-exclusion plugins)
        codespell        -- check for misspelled words in source code
     -p auto          -- run test environments in parallel
     --help           -- show tox help