Write a test for cleartokens management command

[n2ygk]

Is your feature request related to a problem? Please describe.

Code coverage of the cleartokens management command has been 0% since it was created in 2015.

Describe the solution you'd like

Write a test for the cleartokens command.

Describe alternatives you've considered

It's not core functionality so could continue to have 0% coverage but it would be nice to add.

Additional context

See also #969

[n2ygk]

in process