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#[cfg(test)] mod tests { #[test] fn test_next_power_of_two() { assert_eq!(0usize.next_power_of_two(), 1); assert_eq!(1usize.next_power_of_two(), 1); assert_eq!(2usize.next_power_of_two(), 2); assert_eq!(3usize.next_power_of_two(), 4); } }