refactor/polish ~ inhibit useless warning (within 'tests/tests.rs')
#[macro_use]
mod common;
+// [warning fix]; from ref: <https://github.com/rust-lang/rust-clippy/issues/1938#issuecomment-374816813>
+#[cfg_attr(feature = "cargo-clippy", allow(useless_attribute))]
+#[allow(unused_imports)]
#[cfg(unix)]
#[macro_use]
extern crate lazy_static;
