boto/boto — comment on commit e7bbf0b9f86f566f32c340d267836decfcfdb177
File:  line 0
By claudod:

TestDuration must be changed to TestDurationInSeconds as specified in API Version 2011-10-01. Seems that you did it for create_qualification_test but not for update_qualification_test.
Using this api the error message raises by aws would thus be "Your request is missing required parameters. Required parameters include TestDuration"