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44a79741ff
The content slides all use `fn main`, with the exception of the testing segment. But with this change, where it makes sense exercises use tests instead, and not both tests and `fn main`. A small change in `book.js` supports running tests when a code sample does not have `fn main` but does have `#[test]`, so these work naturally. Fixes #1581.
73 lines
2.0 KiB
Rust
73 lines
2.0 KiB
Rust
// ANCHOR: solution
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// ANCHOR: setup
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#![allow(dead_code)]
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pub struct User {
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name: String,
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age: u32,
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height: f32,
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visit_count: u32,
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last_blood_pressure: Option<(u32, u32)>,
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}
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pub struct Measurements {
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height: f32,
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blood_pressure: (u32, u32),
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}
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pub struct HealthReport<'a> {
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patient_name: &'a str,
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visit_count: u32,
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height_change: f32,
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blood_pressure_change: Option<(i32, i32)>,
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}
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impl User {
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pub fn new(name: String, age: u32, height: f32) -> Self {
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Self { name, age, height, visit_count: 0, last_blood_pressure: None }
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}
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// ANCHOR_END: setup
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// ANCHOR: User_visit_doctor
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pub fn visit_doctor(&mut self, measurements: Measurements) -> HealthReport {
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// ANCHOR_END: User_visit_doctor
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self.visit_count += 1;
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let bp = measurements.blood_pressure;
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let report = HealthReport {
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patient_name: &self.name,
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visit_count: self.visit_count,
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height_change: measurements.height - self.height,
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blood_pressure_change: match self.last_blood_pressure {
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Some(lbp) => {
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Some((bp.0 as i32 - lbp.0 as i32, bp.1 as i32 - lbp.1 as i32))
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}
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None => None,
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},
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};
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self.height = measurements.height;
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self.last_blood_pressure = Some(bp);
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report
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}
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}
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// ANCHOR: tests
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#[test]
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fn test_visit() {
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let mut bob = User::new(String::from("Bob"), 32, 155.2);
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assert_eq!(bob.visit_count, 0);
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let report =
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bob.visit_doctor(Measurements { height: 156.1, blood_pressure: (120, 80) });
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assert_eq!(report.patient_name, "Bob");
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assert_eq!(report.visit_count, 1);
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assert_eq!(report.blood_pressure_change, None);
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assert!((report.height_change - 0.9).abs() < 0.00001);
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let report =
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bob.visit_doctor(Measurements { height: 156.1, blood_pressure: (115, 76) });
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assert_eq!(report.visit_count, 2);
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assert_eq!(report.blood_pressure_change, Some((-5, -4)));
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assert_eq!(report.height_change, 0.0);
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}
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// ANCHOR_END: tests
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