mirror of https://github.com/rust-lang/rust
29 lines
793 B
Rust
29 lines
793 B
Rust
//@ run-pass
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use std::collections::LinkedList;
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fn main() {
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const N: usize = 8;
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// Test that for all possible sequences of push_front / push_back,
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// we end up with a LinkedList of the correct size
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for len in 0..N {
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let mut tester = LinkedList::new();
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assert_eq!(tester.len(), 0);
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assert_eq!(tester.front(), None);
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for case in 0..(1 << len) {
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assert_eq!(tester.len(), 0);
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for bit in 0..len {
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if case & (1 << bit) != 0 {
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tester.push_front(());
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} else {
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tester.push_back(());
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}
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}
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assert_eq!(tester.len(), len);
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assert_eq!(tester.iter().count(), len);
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tester.clear();
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}
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}
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}
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