Fix Travis false positive message

Fix Coverage and Test not throwing errors when tests fail.

Co-Authored-By: Carlos Magno <cmagnobarbosa@gmail.com>

Author: gleybersonandrade

setup.py

@@ -111,6 +111,8 @@ def run(self):
             check_call(cmd, shell=True)
         except CalledProcessError as exc:
             print(exc)
+            print('Unit tests failed. Fix the error(s) above and try again.')
+            sys.exit(-1)
 
 
 class TestCoverage(Test):
@@ -126,6 +128,8 @@ def run(self):
             check_call(cmd, shell=True)
         except CalledProcessError as exc:
             print(exc)
+            print('Coverage tests failed. Fix the errors above and try again.')
+            sys.exit(-1)
 
 
 class DocTest(SimpleCommand):