temp-converter 2.0.12

Simple terminal temperature unit converter between Celsius, Fahrenheit and Kelvin.
Documentation 
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pub trait TemperatureConversion {
    #[must_use]
    fn kelvin_to_celsius(&self) -> Self
    where
        Self: Sized;

    #[must_use]
    fn kelvin_to_fahrenheit(&self) -> Self
    where
        Self: Sized;

    #[must_use]
    fn celsius_to_kelvin(&self) -> Self
    where
        Self: Sized;

    #[must_use]
    fn celsius_to_fahrenheit(&self) -> Self
    where
        Self: Sized;

    #[must_use]
    fn fahrenheit_to_kelvin(&self) -> Self
    where
        Self: Sized;

    #[must_use]
    fn fahrenheit_to_celsius(&self) -> Self
    where
        Self: Sized;
}

impl TemperatureConversion for f32 {
    fn kelvin_to_celsius(&self) -> Self {
        self - 273.15
    }

    fn kelvin_to_fahrenheit(&self) -> Self {
        (self - 273.15).mul_add(9_f32 / 5_f32, 32_f32)
    }

    fn celsius_to_kelvin(&self) -> Self {
        self + 273.15
    }

    fn celsius_to_fahrenheit(&self) -> Self {
        self * (9_f32 / 5_f32) + 32_f32
    }

    fn fahrenheit_to_kelvin(&self) -> Self {
        (self - 32_f32).mul_add(5_f32 / 9_f32, 273.15)
    }

    fn fahrenheit_to_celsius(&self) -> Self {
        (self - 32_f32) * (5_f32 / 9_f32)
    }
}

impl TemperatureConversion for f64 {
    fn kelvin_to_celsius(&self) -> Self {
        self - 273.15
    }

    fn kelvin_to_fahrenheit(&self) -> Self {
        (self - 273.15).mul_add(9_f64 / 5_f64, 32_f64)
    }

    fn celsius_to_kelvin(&self) -> Self {
        self + 273.15
    }

    fn celsius_to_fahrenheit(&self) -> Self {
        self * (9_f64 / 5_f64) + 32_f64
    }

    fn fahrenheit_to_kelvin(&self) -> Self {
        (self - 32_f64).mul_add(5_f64 / 9_f64, 273.15)
    }

    fn fahrenheit_to_celsius(&self) -> Self {
        (self - 32_f64) * (5_f64 / 9_f64)
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use rstest::rstest;

    #[rstest]
    #[case(0.0, -273.15)]
    #[case(100.0, -173.15)]
    #[case(1000.0, 726.85)]
    #[case(5000.0, 4726.85)]
    #[case(69_420.0, 69_146.85)]
    fn test_kelvin_to_celsius(#[case] input: f32, #[case] output: f32) {
        assert_eq!(input.kelvin_to_celsius(), output);
    }

    #[rstest]
    #[case(0.0, -459.66998)]
    #[case(100.0, -279.66998)]
    #[case(1000.0, 1340.33)]
    #[case(5000.0, 8540.33)]
    #[case(69_420.0, 124_496.33)]
    fn test_kelvin_to_fahrenheit(#[case] input: f32, #[case] output: f32) {
        assert_eq!(input.kelvin_to_fahrenheit(), output);
    }

    #[rstest]
    #[case(0.0, 273.15)]
    #[case(100.0, 373.15)]
    #[case(1000.0, 1273.15)]
    #[case(5000.0, 5273.15)]
    #[case(69_420.0, 69_693.15)]
    fn test_celsius_to_kelvin(#[case] input: f32, #[case] output: f32) {
        assert_eq!(input.celsius_to_kelvin(), output);
    }

    #[rstest]
    #[case(0.0, 32.0)]
    #[case(100.0, 212.0)]
    #[case(1000.0, 1832.0)]
    #[case(5000.0, 9032.0)]
    #[case(69_420.0, 124_988.0)]
    fn test_celsius_to_fahrenheit(#[case] input: f32, #[case] output: f32) {
        assert_eq!(input.celsius_to_fahrenheit(), output);
    }

    #[rstest]
    #[case(0.0, 255.37222)]
    #[case(100.0, 310.92776)]
    #[case(1000.0, 810.9278)]
    #[case(5000.0, 3033.1501)]
    #[case(69_420.0, 38_822.04)]
    fn test_fahrenheit_to_kelvin(#[case] input: f32, #[case] output: f32) {
        assert_eq!(input.fahrenheit_to_kelvin(), output);
    }

    #[rstest]
    #[case(0.0, -17.777_779)]
    #[case(100.0, 37.77778)]
    #[case(1000.0, 537.77783)]
    #[case(5000.0, 2_760.0002)]
    #[case(69_420.0, 38_548.89)]
    fn test_fahrenheit_to_celsius(#[case] input: f32, #[case] output: f32) {
        assert_eq!(input.fahrenheit_to_celsius(), output);
    }
}