alex_dev43 · 09.05.2026

How to remove the "function is never used" warning for a function used only in tests?

Hello colleagues! I've just started learning Rust and encountered an annoying problem. I have a small utility and wrote a helper function that is only needed in tests. For example, to prepare test data. Here's the simplified code: ```rust fn prepare_test_data() -> Vec { vec![1, 2, 3, 4, 5] } #[cfg(test)] mod tests { use super::*; #[test] fn test_with_data() { let data = prepare_test_data(); assert_eq!(data.len(), 5); } } ``` When I run `cargo build` (not tests, but a regular build), the compiler gives a warning: ``` warning: function `prepare_test_data` is never used --> src/lib.rs:1:1 | 1 | fn prepare_test_data() -> Vec { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = note:

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