in src/gcp/builder.rs [727:737]
fn gcp_test_client_opts() {
let key = "GOOGLE_PROXY_URL";
if let Ok(config_key) = key.to_ascii_lowercase().parse() {
assert_eq!(
GoogleConfigKey::Client(ClientConfigKey::ProxyUrl),
config_key
);
} else {
panic!("{} not propagated as ClientConfigKey", key);
}
}