environment variables - Using rake to run a file -

i have environment variables of app in file this:

export variable=value ... etc

when run tests, have remember run file before, or tests fail. created task in rakefile automatically run file before running tests. not working.

i tried this:

task :env_test { sh('source ./credentials/.env_test') }

but error:

source ./credentials/.env_test rake aborted! command failed status (127): [source ./credentials/.env_test...]

i tried:

task :env_test { `source ./credentials/.env_test` }

and got:

rake aborted! errno::enoent: no such file or directory - source

i tried:

task :env_test { `. ./credentials/.env_test` }

for tests using environment variables fail.

finally tried:

task :env_test { `./credentials/.env_test` }

and again tests fail.

what doing wrong?

ANy