You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: env.rs
    path of file: ./repos/delta/src
    
    the code of the file until where you have to start completion: use std::env;

const COLORTERM: &str = "COLORTERM";
const BAT_THEME: &str = "BAT_THEME";
const GIT_CONFIG_PARAMETERS: &str = "GIT_CONFIG_PARAMETERS";
const GIT_PREFIX: &str = "GIT_PREFIX";
const DELTA_F
    
    fn test_env_parsing_with_pager_set_to_bat() {
        env::set_var("PAGER", "bat");
        let env = DeltaEnv::init();
        assert_eq!(
            env.pagers.1,
            Some("bat".into()),
            "Expected env.pagers.1 == Some(bat) but was {:?}",
            env.pagers.1
        );
    }