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30 lines
668 B
Rust
30 lines
668 B
Rust
use crate::hash;
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use std::collections::BTreeSet;
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#[test]
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fn test_hash() {
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let mut x = BTreeSet::new();
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let mut y = BTreeSet::new();
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x.insert(1);
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x.insert(2);
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x.insert(3);
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y.insert(3);
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y.insert(2);
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y.insert(1);
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assert_eq!(hash(&x), hash(&y));
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}
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#[test]
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fn test_prefix_free() {
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let x = BTreeSet::from([1, 2, 3]);
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let y = BTreeSet::<i32>::new();
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// If hashed by iteration alone, `(x, y)` and `(y, x)` would visit the same
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// order of elements, resulting in the same hash. But now that we also hash
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// the length, they get distinct sequences of hashed data.
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assert_ne!(hash(&(&x, &y)), hash(&(&y, &x)));
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}
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