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https://github.com/rust-lang/rustlings
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47 lines
919 B
Rust
47 lines
919 B
Rust
// result1.rs
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// Make this test pass! Scroll down for hints :)
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#[derive(PartialEq, Debug)]
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struct PositiveNonzeroInteger(u64);
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#[derive(PartialEq, Debug)]
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enum CreationError {
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Negative,
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Zero,
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}
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impl PositiveNonzeroInteger {
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fn new(value: i64) -> Result<PositiveNonzeroInteger, CreationError> {
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Ok(PositiveNonzeroInteger(value as u64))
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}
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}
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#[test]
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fn test_creation() {
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assert!(PositiveNonzeroInteger::new(10).is_ok());
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assert_eq!(
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Err(CreationError::Negative),
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PositiveNonzeroInteger::new(-10)
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);
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assert_eq!(Err(CreationError::Zero), PositiveNonzeroInteger::new(0));
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}
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// `PositiveNonzeroInteger::new` is always creating a new instance and returning an `Ok` result.
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// It should be doing some checking, returning an `Err` result if those checks fail, and only
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// returning an `Ok` result if those checks determine that everything is... okay :)
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