Can not stub commands with a period

[toote]

When trying to stub commands with a period you get an error as follows:

   (from function `stub' in file /usr/local/lib/bats/bats-mock/stub.bash, line 11,
    in test file FILE, line X)
     `stub command.extension \' failed
   /usr/local/lib/bats/bats-mock/stub.bash: line 11: export: `COMMAND.EXTENSION_STUB_PLAN=/tmp/command.extension-stub-plan': not a valid identifier

Solution is probably quite easy (just replace the period in the command to create a valid variable name