changes

crates/domain/tests/weather/weather_test.rs

@@ -0,0 +1,60 @@
+use domain::provider::ProviderName;
+use domain::weather::{Celsius, Condition, Weather};
+
+fn open_meteo() -> ProviderName {
+    ProviderName::new("open-meteo").unwrap()
+}
+
+#[test]
+fn a_temperature_nowhere_on_earth_reaches_is_rejected() {
+    assert!(Celsius::new(-95.0).is_err());
+    assert!(Celsius::new(65.0).is_err());
+}
+
+#[test]
+fn the_coldest_and_hottest_places_on_earth_are_valid() {
+    assert!(Celsius::new(-90.0).is_ok());
+    assert!(Celsius::new(60.0).is_ok());
+}
+
+#[test]
+fn a_temperature_that_is_not_a_number_is_rejected() {
+    assert!(Celsius::new(f64::NAN).is_err());
+    assert!(Celsius::new(f64::INFINITY).is_err());
+}
+
+#[test]
+fn every_condition_survives_a_round_trip_through_its_name() {
+    for condition in Condition::ALL {
+        assert_eq!(Condition::from_name(condition.name()), Some(condition));
+    }
+
+    assert_eq!(Condition::from_name("raining cats"), None);
+}
+
+#[test]
+fn the_vocabulary_is_the_one_the_domain_chose_not_the_providers() {
+    let names: Vec<&str> = Condition::ALL.iter().map(|c| c.name()).collect();
+
+    assert_eq!(
+        names,
+        [
+            "clear",
+            "cloudy",
+            "fog",
+            "drizzle",
+            "rain",
+            "snow",
+            "thunderstorm"
+        ]
+    );
+}
+
+#[test]
+fn weather_is_always_attributed_to_whoever_observed_it() {
+    let weather = Weather::new(Condition::Rain, Celsius::new(11.5).unwrap(), open_meteo());
+
+    assert_eq!(weather.condition(), Condition::Rain);
+    assert!((weather.temperature().value() - 11.5).abs() < f64::EPSILON);
+    assert_eq!(weather.observed_by().value(), "open-meteo");
+}