Comment 2 for bug 1460871

WSME 0.7.0 introduced checks and coversions from strings to the intended datatype, so now invalid data, like "bad_enabled" for bools, will throw an error. This is intentional and should be updated in the unit tests which should have valid data unless you want to test error scenarios.
The linked Ceilometer bug and patch set correctly address the issue in the ceilometer unit tests.