hegeltest 0.14.17

Property-based testing for Rust, built on Hypothesis
Documentation 
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// Numeric schema interpreters: integer, boolean, constant.

use crate::native::core::{EngineError, NativeTestCase};
use ciborium::Value;

use super::{bignum_overflows_i128, cbor_to_i128, i128_to_cbor, require, u128_to_cbor};

pub(super) fn interpret_integer(
    ntc: &mut NativeTestCase,
    schema: &Value,
) -> Result<Value, EngineError> {
    let min_cbor = require(schema, "min_value")?;
    let max_cbor = require(schema, "max_value")?;
    let min_value = cbor_to_i128(min_cbor)?;
    let max_value = cbor_to_i128(max_cbor)?;

    // If max saturated because it exceeded i128::MAX (e.g. u128::MAX), draw using
    // a selector + two 64-bit halves to cover the full u128 range.
    if bignum_overflows_i128(max_cbor) {
        let min_value_u128 = if min_value >= 0 { min_value as u128 } else { 0 };
        // Selector: 0 = min_value, 1 = u128::MAX, else = random two-halves.
        let selector = ntc.draw_integer(0, 99)?;
        match selector {
            0 => return Ok(u128_to_cbor(min_value_u128)),
            1 => return Ok(u128_to_cbor(u128::MAX)),
            _ => {}
        }
        let hi = ntc.draw_integer(0, u64::MAX as i128)?;
        let lo = ntc.draw_integer(0, u64::MAX as i128)?;
        let v = ((hi as u128) << 64) | (lo as u128);
        // Clamp to [min_value_u128, u128::MAX]. Values below min are vanishingly
        // rare (prob ≈ min/2^128) but must be handled for correctness.
        return Ok(u128_to_cbor(v.max(min_value_u128)));
    }

    let v = ntc.draw_integer(min_value, max_value)?;
    Ok(i128_to_cbor(v))
}

pub(super) fn interpret_boolean(ntc: &mut NativeTestCase) -> Result<Value, EngineError> {
    let v = ntc.weighted(0.5, None)?;
    Ok(Value::Bool(v))
}

pub(super) fn interpret_constant(schema: &Value) -> Result<Value, EngineError> {
    let value = require(schema, "value")?;
    Ok(value.clone())
}

#[cfg(test)]
#[path = "../../../tests/embedded/native/schema/numeric_tests.rs"]
mod tests;