Call ensure_secret_token! in secret token test's before block since it would...

Call ensure_secret_token! in secret token test's before block since it would be called in an initializer.

spec/lib/gitlab/backend/shell_spec.rb

@@ -30,6 +30,7 @@ describe Gitlab::Shell, lib: true do
       allow(Gitlab.config.gitlab_shell).to receive(:secret_file).and_return(secret_file)
       allow(Gitlab.config.gitlab_shell).to receive(:path).and_return('tmp/tests/shell-secret-test')
       FileUtils.mkdir('tmp/tests/shell-secret-test')
+      Gitlab::Shell.ensure_secret_token!
     end
     after do