examples/define_var/define.spec.js

describe('environment variables', () => {
  it('should accept vars; must be run with --define=some_env=some_value', () => {
    // This test must be run with --define=some_env=some_value.
    // Use `bazel test //examples/define_var --define=some_env=some_value`.
    // Note that use of --define causes the entire build to be non-incremental
    // since --define can affect the output of any action.
    expect(process.env['some_env']).toEqual('some_value');
  });
});