Cargo Features

Rsip has no features set by default.

[dependencies]
rsip = { version = "0.4.0", features = ["test-utils"] }
test-utils = testing-utils

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.

testing-utils test-utils?