27 lines
816 B
Rust
27 lines
816 B
Rust
/// Given the start and end points of a journey, and the time it took to complete the journey,
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/// calculate the average speed of the journey.
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fn speed(start: u32, end: u32, time_elapsed: u32) -> u32 {
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// TODO: Panic with a custom message if `time_elapsed` is 0
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(end - start) / time_elapsed
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}
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#[cfg(test)]
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mod tests {
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use crate::speed;
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#[test]
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fn case1() {
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assert_eq!(speed(0, 10, 10), 1);
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}
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#[test]
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// 👇 With the `#[should_panic]` annotation we can assert that we expect the code
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// under test to panic. We can also check the panic message by using `expected`.
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// This is all part of Rust's built-in test framework!
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#[should_panic(expected = "The journey took no time at all. That's impossible!")]
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fn by_zero() {
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speed(0, 10, 0);
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}
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}
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