50 lines
1.1 KiB
Rust
50 lines
1.1 KiB
Rust
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fn trim_me(input: &str) -> &str {
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input.trim()
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}
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fn compose_me(input: &str) -> String {
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let mut new_string = String::from(input);
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new_string.push_str(" world!");
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new_string
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}
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fn replace_me(input: &str) -> String {
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// Replace "cars" in the string with "balloons".
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input.replace("cars", "balloons")
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}
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fn main() {
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// You can optionally experiment here.
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn trim_a_string() {
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assert_eq!(trim_me("Hello! "), "Hello!");
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assert_eq!(trim_me(" What's up!"), "What's up!");
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assert_eq!(trim_me(" Hola! "), "Hola!");
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}
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#[test]
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fn compose_a_string() {
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assert_eq!(compose_me("Hello"), "Hello world!");
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assert_eq!(compose_me("Goodbye"), "Goodbye world!");
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}
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#[test]
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fn replace_a_string() {
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assert_eq!(
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replace_me("I think cars are cool"),
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"I think balloons are cool",
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);
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assert_eq!(
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replace_me("I love to look at cars"),
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"I love to look at balloons",
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);
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}
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}
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