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rustlings/exercises/08_enums/enums3.rs

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// Address all the TODOs to make the tests pass!
enum Message {
// TODO: implement the message variant types based on their usage below
}
struct Point {
x: u8,
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y: u8,
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}
struct State {
color: (u8, u8, u8),
position: Point,
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quit: bool,
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message: String,
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}
impl State {
fn change_color(&mut self, color: (u8, u8, u8)) {
self.color = color;
}
fn quit(&mut self) {
self.quit = true;
}
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fn echo(&mut self, s: String) {
self.message = s
}
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fn move_position(&mut self, p: Point) {
self.position = p;
}
fn process(&mut self, message: Message) {
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// TODO: create a match expression to process the different message variants
// Remember: When passing a tuple as a function argument, you'll need extra parentheses:
// fn function((t, u, p, l, e))
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}
}
fn main() {
// You can optionally experiment here.
}
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#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_match_message_call() {
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let mut state = State {
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quit: false,
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position: Point { x: 0, y: 0 },
color: (0, 0, 0),
message: "hello world".to_string(),
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};
state.process(Message::ChangeColor(255, 0, 255));
state.process(Message::Echo(String::from("Hello world!")));
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state.process(Message::Move(Point { x: 10, y: 15 }));
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state.process(Message::Quit);
assert_eq!(state.color, (255, 0, 255));
assert_eq!(state.position.x, 10);
assert_eq!(state.position.y, 15);
assert_eq!(state.quit, true);
assert_eq!(state.message, "Hello world!");
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}
}