|
| 1 | +use derive_more::Display; |
| 2 | + |
| 3 | +#[derive(Debug, Display, Clone, Copy, PartialEq, Default)] |
| 4 | +pub struct AggregateValue(f64); |
| 5 | + |
| 6 | +impl AggregateValue { |
| 7 | + #[must_use] |
| 8 | + pub fn new(value: f64) -> Self { |
| 9 | + Self(value) |
| 10 | + } |
| 11 | + |
| 12 | + #[must_use] |
| 13 | + pub fn value(&self) -> f64 { |
| 14 | + self.0 |
| 15 | + } |
| 16 | +} |
| 17 | + |
| 18 | +impl From<f64> for AggregateValue { |
| 19 | + fn from(value: f64) -> Self { |
| 20 | + Self(value) |
| 21 | + } |
| 22 | +} |
| 23 | + |
| 24 | +impl From<AggregateValue> for f64 { |
| 25 | + fn from(value: AggregateValue) -> Self { |
| 26 | + value.0 |
| 27 | + } |
| 28 | +} |
| 29 | + |
| 30 | +#[cfg(test)] |
| 31 | +mod tests { |
| 32 | + use approx::assert_relative_eq; |
| 33 | + |
| 34 | + use super::*; |
| 35 | + |
| 36 | + #[test] |
| 37 | + fn it_should_be_created_with_new() { |
| 38 | + let value = AggregateValue::new(42.5); |
| 39 | + assert_relative_eq!(value.value(), 42.5); |
| 40 | + } |
| 41 | + |
| 42 | + #[test] |
| 43 | + fn it_should_return_the_inner_value() { |
| 44 | + let value = AggregateValue::new(123.456); |
| 45 | + assert_relative_eq!(value.value(), 123.456); |
| 46 | + } |
| 47 | + |
| 48 | + #[test] |
| 49 | + fn it_should_handle_zero_value() { |
| 50 | + let value = AggregateValue::new(0.0); |
| 51 | + assert_relative_eq!(value.value(), 0.0); |
| 52 | + } |
| 53 | + |
| 54 | + #[test] |
| 55 | + fn it_should_handle_negative_values() { |
| 56 | + let value = AggregateValue::new(-42.5); |
| 57 | + assert_relative_eq!(value.value(), -42.5); |
| 58 | + } |
| 59 | + |
| 60 | + #[test] |
| 61 | + fn it_should_handle_infinity() { |
| 62 | + let value = AggregateValue::new(f64::INFINITY); |
| 63 | + assert_relative_eq!(value.value(), f64::INFINITY); |
| 64 | + } |
| 65 | + |
| 66 | + #[test] |
| 67 | + fn it_should_handle_nan() { |
| 68 | + let value = AggregateValue::new(f64::NAN); |
| 69 | + assert!(value.value().is_nan()); |
| 70 | + } |
| 71 | + |
| 72 | + #[test] |
| 73 | + fn it_should_be_created_from_f64() { |
| 74 | + let value: AggregateValue = 42.5.into(); |
| 75 | + assert_relative_eq!(value.value(), 42.5); |
| 76 | + } |
| 77 | + |
| 78 | + #[test] |
| 79 | + fn it_should_convert_to_f64() { |
| 80 | + let value = AggregateValue::new(42.5); |
| 81 | + let f64_value: f64 = value.into(); |
| 82 | + assert_relative_eq!(f64_value, 42.5); |
| 83 | + } |
| 84 | + |
| 85 | + #[test] |
| 86 | + fn it_should_be_displayable() { |
| 87 | + let value = AggregateValue::new(42.5); |
| 88 | + assert_eq!(value.to_string(), "42.5"); |
| 89 | + } |
| 90 | + |
| 91 | + #[test] |
| 92 | + fn it_should_be_debuggable() { |
| 93 | + let value = AggregateValue::new(42.5); |
| 94 | + let debug_string = format!("{value:?}"); |
| 95 | + assert_eq!(debug_string, "AggregateValue(42.5)"); |
| 96 | + } |
| 97 | + |
| 98 | + #[test] |
| 99 | + fn it_should_be_cloneable() { |
| 100 | + let value = AggregateValue::new(42.5); |
| 101 | + let cloned_value = value; |
| 102 | + assert_eq!(value, cloned_value); |
| 103 | + } |
| 104 | + |
| 105 | + #[test] |
| 106 | + fn it_should_be_copyable() { |
| 107 | + let value = AggregateValue::new(42.5); |
| 108 | + let copied_value = value; |
| 109 | + assert_eq!(value, copied_value); |
| 110 | + } |
| 111 | + |
| 112 | + #[test] |
| 113 | + fn it_should_support_equality_comparison() { |
| 114 | + let value1 = AggregateValue::new(42.5); |
| 115 | + let value2 = AggregateValue::new(42.5); |
| 116 | + let value3 = AggregateValue::new(43.0); |
| 117 | + |
| 118 | + assert_eq!(value1, value2); |
| 119 | + assert_ne!(value1, value3); |
| 120 | + } |
| 121 | + |
| 122 | + #[test] |
| 123 | + fn it_should_handle_special_float_values_in_equality() { |
| 124 | + let nan1 = AggregateValue::new(f64::NAN); |
| 125 | + let nan2 = AggregateValue::new(f64::NAN); |
| 126 | + let infinity = AggregateValue::new(f64::INFINITY); |
| 127 | + let neg_infinity = AggregateValue::new(f64::NEG_INFINITY); |
| 128 | + |
| 129 | + // NaN is not equal to itself in IEEE 754 |
| 130 | + assert_ne!(nan1, nan2); |
| 131 | + assert_eq!(infinity, AggregateValue::new(f64::INFINITY)); |
| 132 | + assert_eq!(neg_infinity, AggregateValue::new(f64::NEG_INFINITY)); |
| 133 | + assert_ne!(infinity, neg_infinity); |
| 134 | + } |
| 135 | + |
| 136 | + #[test] |
| 137 | + fn it_should_handle_conversion_roundtrip() { |
| 138 | + let original_value = 42.5; |
| 139 | + let aggregate_value = AggregateValue::from(original_value); |
| 140 | + let converted_back: f64 = aggregate_value.into(); |
| 141 | + assert_relative_eq!(original_value, converted_back); |
| 142 | + } |
| 143 | +} |
0 commit comments