Test different approach

.travis/cover.py

@@ -18,13 +18,18 @@
 # along with Rose. If not, see <http://www.gnu.org/licenses/>.
 # -----------------------------------------------------------------------------
 
+import sys
+
 from subprocess import call
 
 
 def main():
-    call(
-        'rose test-battery --state=save -j 5 || (echo -e "\n\nRerunning Failed Tests...\n\n"; rose test-battery -v --state=save,failed -j 5)',
-        shell=True)
+    command = ['rose', 'test-battery', '-j', '5']
+    if call(command + ['--state=save']):
+        # Non-zero return code
+        sys.stderr.write('\n\nRerunning Failed Tests...\n\n')
+        # Exit with final return code
+        sys.exit(call(command + ['--state=save,failed', '-v']))
 
 
 if __name__ == '__main__':