Only the Continuous Integration is verbose

test/test_compilation/test_compilation.py

@@ -112,10 +112,14 @@ class FileTest(unittest.TestCase, metaclass=dynamic.DynamicTest):
     @staticmethod
     def compile_songbook(songbook, steps=None):
         """Compile songbook, and return the command return code."""
-        command = [sys.executable, '-m', 'patacrep.songbook', songbook, '-v']
+        command = [sys.executable, '-m', 'patacrep.songbook', songbook]
         if steps:
             command.extend(['--steps', steps])
 
+        # Continuous Integration will be verbose
+        if 'CI' in os.environ:
+            command.append('-v')
+
         try:
             subprocess.check_call(
                 command,

tox.ini

@@ -7,7 +7,7 @@ envlist = py34, lint
 
 [testenv]
 commands = {envpython} setup.py test
-passenv = TRAVIS APPVEYOR
+passenv = TRAVIS APPVEYOR CI
 deps =
 
 [testenv:lint]