Update _axes.py

denning done goofed
updated decision test suite for code update
fixed denning's goofed code
adjusted test cases to meet requirement
fixed indentation
opened file for black box testing of margins
added integration testing for _set_label_string
add integration and blackbox test cases for margins and set_label
add integration and blackbox test cases for set_label_string and margins, fix bug in _base.py in line 1828
Merge branch 'master' of https://github.com/CSCD01/SUCH-TEAM-WOW
add integration and blackbox testing for set_label_string and margins, fix bug in _base.py in line 1828
Black box testing for eventplot and bar labels cases
Removed eventplot and bar blackbox tests from master branch