uninum 0.1.1

A robust, ergonomic unified number type for Rust with automatic overflow handling, type promotion, and cross-type consistency.
Documentation 
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//! Mathematical Predicate Tests
//!
//! This module contains comprehensive tests for mathematical predicate
//! functions:
//! - is_integer, is_float
//! - is_zero, is_positive, is_negative
//! - Type checking and consistency validation

use uninum::{Number, num};

#[test]
fn test_is_integer_comprehensive() {
    // All integer types should return true
    assert!(Number::from(42u64).is_integer());
    assert!(Number::from(-42i64).is_integer());
    assert!(Number::from(1000u64).is_integer());
    assert!(Number::from(-1000i64).is_integer());
    assert!(Number::from(u64::from(u32::MAX)).is_integer());
    assert!(Number::from(i64::from(i32::MIN)).is_integer());
    assert!(Number::from(0u64).is_integer());
    assert!(Number::from(i64::MAX).is_integer());

    // Float values that are whole numbers
    assert!(num!(42.0f64).is_integer());
    assert!(num!(42.0f64).is_integer());
    assert!(num!(-42.0f64).is_integer());
    assert!(num!(-42.0f64).is_integer());
    assert!(num!(0.0f64).is_integer());
    assert!(num!(0.0f64).is_integer());
    assert!(num!(-0.0f64).is_integer());
    assert!(num!(-0.0f64).is_integer());

    // Very large floats (effectively integers)
    assert!(num!(1e20f64).is_integer());
    assert!(num!(1e15f64).is_integer());

    // Float values with fractional parts
    assert!(!num!(42.5f64).is_integer());
    assert!(!num!(42.5f64).is_integer());
    assert!(!num!(0.1f64).is_integer());
    assert!(!num!(0.1f64).is_integer());
    assert!(!num!(-0.1f64).is_integer());
    assert!(!num!(-0.1f64).is_integer());

    // Special float values
    assert!(!num!(f64::NAN).is_integer());
    assert!(!num!(f64::NAN).is_integer());
    assert!(!num!(f64::INFINITY).is_integer());
    assert!(!num!(f64::INFINITY).is_integer());
    assert!(!num!(f64::NEG_INFINITY).is_integer());
    assert!(!num!(f64::NEG_INFINITY).is_integer());

    // Edge cases with very small fractional parts
    let almost_int = num!(42.0 + f64::EPSILON);
    // This might be considered an integer due to precision limits
    let _is_int = almost_int.is_integer();

    // Test with subnormal values
    let tiny = num!(f64::MIN_POSITIVE / 1000.0);
    assert!(!tiny.is_integer());

    #[cfg(feature = "decimal")]
    {
        use rust_decimal::Decimal;

        // Decimal integers
        assert!(Number::from(Decimal::from(42)).is_integer());
        assert!(Number::from(Decimal::from(-42)).is_integer());
        assert!(Number::from(Decimal::ZERO).is_integer());

        // Decimal with fractional parts
        assert!(!Number::from(Decimal::try_from(std::f64::consts::PI).unwrap()).is_integer());
        assert!(!Number::from(Decimal::try_from(-2.5).unwrap()).is_integer());
    }
}

#[test]
fn test_is_float_comprehensive() {
    // All integer types should return false
    assert!(!Number::from(42u64).is_float());
    assert!(!Number::from(-42i64).is_float());
    assert!(!Number::from(1000u64).is_float());
    assert!(!Number::from(-1000i64).is_float());
    assert!(!Number::from(u64::from(u32::MAX)).is_float());
    assert!(!Number::from(i64::from(i32::MIN)).is_float());
    assert!(!Number::from(0u64).is_float());
    assert!(!Number::from(i64::MAX).is_float());

    // All float types should return true
    assert!(num!(42.0f64).is_float());
    assert!(num!(42.0f64).is_float());
    assert!(num!(-42.0f64).is_float());
    assert!(num!(-42.0f64).is_float());
    assert!(num!(0.0f64).is_float());
    assert!(num!(0.0f64).is_float());
    assert!(num!(-0.0f64).is_float());
    assert!(num!(-0.0f64).is_float());

    // Float values with fractional parts
    assert!(num!(42.5f64).is_float());
    assert!(num!(42.5f64).is_float());
    assert!(num!(0.1f64).is_float());
    assert!(num!(0.1f64).is_float());

    // Special float values
    assert!(num!(f64::NAN).is_float());
    assert!(num!(f64::NAN).is_float());
    assert!(num!(f64::INFINITY).is_float());
    assert!(num!(f64::INFINITY).is_float());
    assert!(num!(f64::NEG_INFINITY).is_float());
    assert!(num!(f64::NEG_INFINITY).is_float());

    #[cfg(feature = "decimal")]
    {
        use rust_decimal::Decimal;

        // Decimal types are considered floats in this implementation
        assert!(Number::from(Decimal::from(42)).is_float());
        assert!(Number::from(Decimal::try_from(std::f64::consts::PI).unwrap()).is_float());
    }
}

#[test]
fn test_is_zero_comprehensive() {
    // Test all integer types with zero
    assert!(Number::from(0u64).is_zero());
    assert!(Number::from(0i64).is_zero());
    assert!(Number::from(0u64).is_zero());
    assert!(Number::from(0i64).is_zero());
    assert!(Number::from(0u64).is_zero());
    assert!(Number::from(0i64).is_zero());
    assert!(Number::from(0u64).is_zero());
    assert!(Number::from(0i64).is_zero());

    // Test all integer types with non-zero values
    assert!(!Number::from(1u64).is_zero());
    assert!(!Number::from(255u64).is_zero());
    assert!(!Number::from(-1i64).is_zero());
    assert!(!Number::from(-128i64).is_zero());
    assert!(!Number::from(65535u64).is_zero());
    assert!(!Number::from(-32768i64).is_zero());
    assert!(!Number::from(u64::from(u32::MAX)).is_zero());
    assert!(!Number::from(i64::from(i32::MIN)).is_zero());
    assert!(!Number::from(u64::MAX).is_zero());
    assert!(!Number::from(i64::MIN).is_zero());

    // Test positive and negative zero for floats (both are zero)
    assert!(num!(0.0f64).is_zero());
    assert!(num!(-0.0f64).is_zero());
    assert!(num!(0.0f64).is_zero());
    assert!(num!(-0.0f64).is_zero());

    // Test smallest positive floats (not zero)
    assert!(!num!(f64::MIN_POSITIVE).is_zero());
    assert!(!num!(f64::MIN_POSITIVE).is_zero());
    assert!(!Number::from(-f64::MIN_POSITIVE).is_zero());
    assert!(!Number::from(-f64::MIN_POSITIVE).is_zero());

    // Test subnormal values (not zero)
    assert!(!num!(f64::MIN_POSITIVE / 2.0).is_zero());
    assert!(!num!(f64::MIN_POSITIVE / 2.0).is_zero());

    // Test special float values
    assert!(!num!(f64::NAN).is_zero());
    assert!(!num!(f64::INFINITY).is_zero());
    assert!(!num!(f64::NEG_INFINITY).is_zero());
    assert!(!num!(f64::NAN).is_zero());
    assert!(!num!(f64::INFINITY).is_zero());
    assert!(!num!(f64::NEG_INFINITY).is_zero());

    #[cfg(feature = "decimal")]
    {
        use rust_decimal::Decimal;
        assert!(Number::from(Decimal::ZERO).is_zero());
        assert!(!Number::from(Decimal::new(1, 28)).is_zero());
        assert!(!Number::from(Decimal::new(-1, 28)).is_zero());
    }
}

#[test]
fn test_is_positive_comprehensive() {
    // Test positive integers
    assert!(Number::from(1u64).is_positive());
    assert!(Number::from(255u64).is_positive());
    assert!(Number::from(1000u64).is_positive());
    assert!(Number::from(42u64).is_positive());
    assert!(Number::from(u64::MAX).is_positive());
    assert!(Number::from(1i64).is_positive());
    assert!(Number::from(127i64).is_positive());
    assert!(Number::from(1000i64).is_positive());
    assert!(Number::from(42i64).is_positive());
    assert!(Number::from(i64::MAX).is_positive());

    // Test zero - should NOT be positive
    assert!(!Number::from(0u64).is_positive());
    assert!(!Number::from(0i64).is_positive());
    assert!(!Number::from(0u64).is_positive());
    assert!(!Number::from(0i64).is_positive());
    assert!(!num!(0.0f64).is_positive());
    assert!(!num!(-0.0f64).is_positive());
    assert!(!num!(0.0f64).is_positive());
    assert!(!num!(-0.0f64).is_positive());

    // Test negative integers
    assert!(!Number::from(-1i64).is_positive());
    assert!(!Number::from(-1000i64).is_positive());
    assert!(!Number::from(-42i64).is_positive());
    assert!(!Number::from(i64::MIN).is_positive());

    // Test positive floats
    assert!(num!(0.1f64).is_positive());
    assert!(Number::from(std::f64::consts::PI).is_positive());
    assert!(Number::from(0.001f64).is_positive());
    assert!(num!(f64::MAX).is_positive());
    assert!(num!(f64::MIN_POSITIVE).is_positive());

    // Test negative floats
    assert!(!num!(-0.1f64).is_positive());
    assert!(!Number::from(-std::f64::consts::PI).is_positive());

    // Test special float values
    assert!(num!(f64::INFINITY).is_positive());
    assert!(!num!(f64::NEG_INFINITY).is_positive());
    assert!(!num!(f64::NAN).is_positive());
    assert!(num!(f64::INFINITY).is_positive());
    assert!(!num!(f64::NEG_INFINITY).is_positive());
    assert!(!num!(f64::NAN).is_positive());

    #[cfg(feature = "decimal")]
    {
        use rust_decimal::Decimal;
        assert!(!Number::from(Decimal::ZERO).is_positive());
        assert!(Number::from(Decimal::new(42, 0)).is_positive());
        assert!(!Number::from(Decimal::new(-42, 0)).is_positive());
    }
}

#[test]
fn test_is_negative_comprehensive() {
    // Test unsigned integers - can never be negative
    assert!(!Number::from(0u64).is_negative());
    assert!(!Number::from(1u64).is_negative());
    assert!(!Number::from(255u64).is_negative());
    assert!(!Number::from(0u64).is_negative());
    assert!(!Number::from(65535u64).is_negative());
    assert!(!Number::from(0u64).is_negative());
    assert!(!Number::from(u64::from(u32::MAX)).is_negative());
    assert!(!Number::from(0u64).is_negative());
    assert!(!Number::from(u64::MAX).is_negative());

    // Test positive signed integers
    assert!(!Number::from(1i64).is_negative());
    assert!(!Number::from(127i64).is_negative());
    assert!(!Number::from(1000i64).is_negative());
    assert!(!Number::from(42i64).is_negative());
    assert!(!Number::from(i64::MAX).is_negative());

    // Test zero - should NOT be negative
    assert!(!Number::from(0i64).is_negative());
    assert!(!Number::from(0i64).is_negative());
    assert!(!Number::from(0i64).is_negative());
    assert!(!Number::from(0i64).is_negative());
    assert!(!num!(0.0f64).is_negative());
    assert!(!num!(-0.0f64).is_negative());
    assert!(!num!(0.0f64).is_negative());
    assert!(!num!(-0.0f64).is_negative());

    // Test negative signed integers
    assert!(Number::from(-1i64).is_negative());
    assert!(Number::from(-128i64).is_negative());
    assert!(Number::from(-1000i64).is_negative());
    assert!(Number::from(-42i64).is_negative());
    assert!(Number::from(i64::MIN).is_negative());

    // Test positive floats
    assert!(!num!(0.1f64).is_negative());
    assert!(!Number::from(std::f64::consts::PI).is_negative());
    assert!(!num!(0.001f64).is_negative());
    assert!(!num!(f64::MAX).is_negative());

    // Test negative floats
    assert!(num!(-0.1f64).is_negative());
    assert!(Number::from(-std::f64::consts::PI).is_negative());
    assert!(num!(-0.001f64).is_negative());
    assert!(Number::from(-f64::MAX).is_negative());

    // Test special float values
    assert!(!num!(f64::INFINITY).is_negative());
    assert!(num!(f64::NEG_INFINITY).is_negative());
    assert!(!num!(f64::NAN).is_negative());
    assert!(!num!(f64::INFINITY).is_negative());
    assert!(num!(f64::NEG_INFINITY).is_negative());
    assert!(!num!(f64::NAN).is_negative());

    #[cfg(feature = "decimal")]
    {
        use rust_decimal::Decimal;
        assert!(!Number::from(Decimal::ZERO).is_negative());
        assert!(!Number::from(Decimal::new(42, 0)).is_negative());
        assert!(Number::from(Decimal::new(-42, 0)).is_negative());
    }
}

#[test]
fn test_sign_consistency() {
    // Test mathematical consistency: exactly one of {zero, positive, negative, NaN}
    let test_values = vec![
        Number::from(0u64),
        Number::from(1u64),
        Number::from(255u64),
        Number::from(0i64),
        Number::from(1i64),
        Number::from(-1i64),
        Number::from(127i64),
        Number::from(-128i64),
        Number::from(0u64),
        Number::from(1u64),
        Number::from(65535u64),
        Number::from(0i64),
        Number::from(1i64),
        Number::from(-1i64),
        Number::from(32767i64),
        Number::from(-32768i64),
        Number::from(0u64),
        Number::from(1u64),
        Number::from(u64::from(u32::MAX)),
        Number::from(0i64),
        Number::from(1i64),
        Number::from(-1i64),
        Number::from(i64::from(i32::MAX)),
        Number::from(i64::from(i32::MIN)),
        Number::from(0u64),
        Number::from(1u64),
        Number::from(u64::MAX),
        Number::from(0i64),
        Number::from(1i64),
        Number::from(-1i64),
        Number::from(i64::MAX),
        Number::from(i64::MIN),
        num!(0.0f64),
        num!(-0.0f64),
        num!(1.0f64),
        num!(-1.0f64),
        num!(f64::MIN),
        num!(f64::MAX),
        num!(f64::MIN_POSITIVE),
        Number::from(-f64::MIN_POSITIVE),
        num!(f64::EPSILON),
        Number::from(-f64::EPSILON),
        num!(f64::NAN),
        Number::from(-f64::NAN),
        num!(f64::INFINITY),
        num!(f64::NEG_INFINITY),
        num!(0.0f64),
        num!(-0.0f64),
        num!(1.0f64),
        num!(-1.0f64),
        num!(f64::MIN),
        num!(f64::MAX),
        num!(f64::MIN_POSITIVE),
        Number::from(-f64::MIN_POSITIVE),
        num!(f64::EPSILON),
        Number::from(-f64::EPSILON),
        num!(f64::NAN),
        Number::from(-f64::NAN),
        num!(f64::INFINITY),
        num!(f64::NEG_INFINITY),
        num!(f64::MIN_POSITIVE / 2.0),
        Number::from(-f64::MIN_POSITIVE / 2.0),
        num!(f64::MIN_POSITIVE / 2.0),
        Number::from(-f64::MIN_POSITIVE / 2.0),
    ];

    for value in test_values {
        let is_zero = value.is_zero();
        let is_positive = value.is_positive();
        let is_negative = value.is_negative();
        let is_nan = value.is_nan();

        let count = [is_zero, is_positive, is_negative, is_nan]
            .iter()
            .filter(|&&x| x)
            .count();

        if is_nan {
            assert_eq!(count, 1, "NaN {value:?} should only have is_nan() true");
            assert!(!is_zero && !is_positive && !is_negative);
        } else {
            assert_eq!(
                count, 1,
                "Value {value:?} should have exactly one sign property, but has {count}"
            );
        }

        if is_zero {
            assert!(!is_positive && !is_negative && !is_nan);
            assert!(value.is_finite() && !value.is_normal());
        }
        if is_positive {
            assert!(!is_zero && !is_negative && !is_nan);
            assert!(value.is_finite() || value.is_pos_inf());
        }
        if is_negative {
            assert!(!is_zero && !is_positive && !is_nan);
            assert!(value.is_finite() || value.is_neg_inf());
        }
    }
}

#[test]
fn test_subnormal_values() {
    let subnormal_f64 = num!(f64::MIN_POSITIVE / 2.0);
    let subnormal_f64_2 = num!(f64::MIN_POSITIVE / 2.0);

    assert!(!subnormal_f64.is_zero());
    assert!(subnormal_f64.is_positive());
    assert!(!subnormal_f64.is_negative());

    assert!(!subnormal_f64_2.is_zero());
    assert!(subnormal_f64_2.is_positive());
    assert!(!subnormal_f64_2.is_negative());

    let neg_subnormal_f64 = Number::from(-f64::MIN_POSITIVE / 2.0);
    let neg_subnormal_f64_2 = Number::from(-f64::MIN_POSITIVE / 2.0);

    assert!(!neg_subnormal_f64.is_zero());
    assert!(!neg_subnormal_f64.is_positive());
    assert!(neg_subnormal_f64.is_negative());

    assert!(!neg_subnormal_f64_2.is_zero());
    assert!(!neg_subnormal_f64_2.is_positive());
    assert!(neg_subnormal_f64_2.is_negative());
}

#[test]
fn test_fast_dispatch_methods() {
    let int_val = Number::from(42u64);
    let float_val = num!(42.5f64);
    let zero_val = Number::from(0i64);

    assert!(int_val.is_integer());
    assert!(!float_val.is_integer());

    assert!(!int_val.is_float());
    assert!(float_val.is_float());

    assert!(!int_val.is_zero());
    assert!(!float_val.is_zero());
    assert!(zero_val.is_zero());
}