From 730b81c9893237ce08da3cc710451a4a13e65c0f 2014-11-18 18:41:46 From: Thomas Kluyver Date: 2014-11-18 18:41:46 Subject: [PATCH] Add debugging print for test failure on Windows --- diff --git a/IPython/testing/tools.py b/IPython/testing/tools.py index 9effe93..00a3d30 100644 --- a/IPython/testing/tools.py +++ b/IPython/testing/tools.py @@ -218,6 +218,11 @@ def ipexec(fname, options=None, commands=()): full_cmd = ipython_cmd + cmdargs + [full_fname] env = os.environ.copy() env.pop('PYTHONWARNINGS', None) # Avoid extraneous warnings appearing on stderr + for k, v in env.items(): + # Debug a bizarre failure we've seen on Windows: + # TypeError: environment can only contain strings + if not isinstance(v, str): + print(v) p = Popen(full_cmd, stdout=PIPE, stderr=PIPE, stdin=PIPE, env=env) out, err = p.communicate(input=py3compat.str_to_bytes('\n'.join(commands)) or None) out, err = py3compat.bytes_to_str(out), py3compat.bytes_to_str(err)