Currently, you can pass environment variables one at a time with --test_env. It would be nice to be able to pass an entire file of env variables to bazel test with something like:

bazel test --test_env_file=.env //...

env are becoming semi-standard, and lots of tools understand how to read them. For example:

• docker run --env-file
• foreman --env
• https://github.com/bkeepers/dotenv

This improvement would allow people to use their existing env files with bazel.