since this is json, no need for the json version to be formatted strictly. so this guy could be:

consumer_json="""
{"version":"0.7.13.13-1",
"created":"2013-02-21T15:31:44.058+0000",
"principalName":"stage_test_6",
"webAppPrefix":""access.stage.redhat.com/management/distributors/"}
"""

and then the _build_valid_manifest should be in the test code, and
could include something like: 
...
```consumer_export_object.writestr("export/consumer.json", manifestdata.consumer_json)
```