64 lines
2.1 KiB
Rust
64 lines
2.1 KiB
Rust
//! Tests for plane angle quantities.
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//!
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//! 平面角量的测试。
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use apsis_core::{Quantity, Unit};
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use apsis_units::dimension::Angle;
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use apsis_units::{Degrees, Radians};
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use core::f64::consts::PI;
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#[test]
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fn direct_conversions_are_consistent() {
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assert!((Degrees::new(180.0).to_radians().value() - PI).abs() < 1e-12);
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assert!((Radians::new(PI).to_degrees().value() - 180.0).abs() < 1e-12);
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assert!((Degrees::new(90.0).to_radians().value() - PI / 2.0).abs() < 1e-12);
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}
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#[test]
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fn generic_conversion_matches_direct_conversion() {
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let angle = Degrees::new(45.0);
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let via_trait: Radians = angle.to_unit();
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assert!((via_trait.value() - angle.to_radians().value()).abs() < 1e-12);
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}
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#[test]
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fn conversion_round_trips() {
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let original = Degrees::new(137.5);
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let round_tripped: Degrees = original.to_unit::<Radians>().to_unit();
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assert!((round_tripped.value() - original.value()).abs() < 1e-12);
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}
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#[test]
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fn wrap_places_angles_in_the_canonical_range() {
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for turns in -3..=3 {
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let angle = Radians::new(PI + f64::from(turns) * 2.0 * PI);
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let wrapped = angle.wrap();
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assert!(wrapped.value() >= -PI);
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assert!(wrapped.value() < PI);
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// Wrapping shifts by whole turns, so the angle is preserved
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// modulo two pi.
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// 环绕按整周平移，故该角在模 2 pi 的意义下保持。
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let difference = angle.value() - wrapped.value();
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assert!((difference / (2.0 * PI)).fract().abs() < 1e-12);
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}
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assert!((Radians::new(0.0).wrap().value()).abs() < 1e-12);
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assert!((Radians::new(PI).wrap().value() + PI).abs() < 1e-12);
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}
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#[test]
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fn unit_metadata_is_available() {
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assert_eq!(Radians::symbol(), "rad");
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assert_eq!(Degrees::symbol(), "deg");
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assert_eq!(Radians::factor_to_base(), 1.0);
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assert!((Degrees::factor_to_base() - PI / 180.0).abs() < 1e-15);
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fn assert_angle<U: Unit<Dimension = Angle>>() {}
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assert_angle::<Radians>();
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assert_angle::<Degrees>();
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}
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#[test]
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fn display_includes_the_symbol() {
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assert_eq!(Radians::new(1.0).to_string(), "1 rad");
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assert_eq!(Degrees::new(90.0).to_string(), "90 deg");
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}
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