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Fix test_threshold_nonzero #1278

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Fix test_threshold_nonzero #1278

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103 changes: 63 additions & 40 deletions vrf/src/threshold.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -225,56 +225,79 @@ mod test {

use super::*;

// TODO: move to regular fns, rework step
fn first_non_zero(stake: BigInt, total_currency: BigInt, step: BigInt) -> BigInt {
let ten = BigInt::from_str("10").unwrap();
let mut stake = stake;
if step == BigInt::zero() {
stake + BigInt::one()
} else {
loop {
let thrs = Threshold::new(stake.clone(), total_currency.clone());

if thrs.threshold_rational != BigRational::zero() {
println!("stake: {stake} nanoMINA");
return first_non_zero(stake - step.clone(), total_currency, step / ten);
#[test]
fn test_threshold_nonzero() {
/// Binary search to find the exact point where threshold becomes non-zero
fn binary_search(total_currency: BigInt) -> BigInt {
let mut low = BigInt::zero();
let mut high = total_currency.clone();
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Copilot AI Aug 13, 2025

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[nitpick] Extra space between 'high' and '=' creates inconsistent formatting compared to the line above.

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while low < high {
let mid: BigInt = (&low + &high) / 2;
let thrs = Threshold::new(mid.clone(), total_currency.clone());

if thrs.threshold_rational == BigRational::zero() {
low = mid + BigInt::one();
} else {
high = mid.clone();
}
stake += step.clone();
}
low
}
}

#[test]
#[ignore]
fn test_threshold_nonzero() {
// let total_currency = BigInt::from_str("1157953132840039233").unwrap();
// let initial_stake = BigInt::zero();
// let initial_step = BigInt::from_str("10000000000000000000").unwrap();

let total_currency = BigInt::from_str("1025422352000001000").unwrap();
let initial_stake = BigInt::zero();
let initial_step = BigInt::from_str("10000000000000000000").unwrap();

let first_non_zero_nanomina =
first_non_zero(initial_stake, total_currency.clone(), initial_step);

let last_zero = first_non_zero_nanomina.clone() - BigInt::one();
// Different total currency values to test
let test_cases = vec![
("1025422352000001000", "Test case 1"), // Original value
("1157953132840039233", "Test case 2"), // Another value from comments
("1000000000000000000", "1 billion MINA"), // 1 billion MINA
("5000000000000000000", "5 billion MINA"), // 5 billion MINA
("10000000000000000000", "10 billion MINA"), // 10 billion MINA
("100000000000000000", "100 million MINA"), // 100 million MINA
];

for (total_currency_str, description) in test_cases {
let total_currency = BigInt::from_str(total_currency_str).unwrap();

let first_non_zero_stake = binary_search(total_currency.clone());

// Verify we found the exact transition point
assert!(
first_non_zero_stake > BigInt::zero() && first_non_zero_stake <= total_currency,
"First non-zero stake should be between 1 and total_currency for {}",
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Copilot AI Aug 13, 2025

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The assertion allows first_non_zero_stake to equal total_currency, but this would mean the entire currency supply has zero threshold, which seems logically incorrect for a VRF threshold test.

Suggested change
"First non-zero stake should be between 1 and total_currency for {}",
first_non_zero_stake > BigInt::zero() && first_non_zero_stake < total_currency,
"First non-zero stake should be between 1 and total_currency-1 for {}",

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description
);

let thrs_zero = Threshold::new(last_zero, total_currency.clone());
assert_eq!(thrs_zero.threshold_rational, BigRational::zero());
// Verify the transition point
let last_zero_stake = &first_non_zero_stake - BigInt::one();
let thrs_zero = Threshold::new(last_zero_stake, total_currency.clone());
assert_eq!(
thrs_zero.threshold_rational,
BigRational::zero(),
"Threshold should be zero for stake one less than first non-zero for {}",
description
);
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This subtraction could underflow if first_non_zero_stake is zero, causing a panic. Consider adding a check to ensure first_non_zero_stake > BigInt::zero() before this operation.

Suggested change
);
if first_non_zero_stake > BigInt::zero() {
let last_zero_stake = &first_non_zero_stake - BigInt::one();
let thrs_zero = Threshold::new(last_zero_stake, total_currency.clone());
assert_eq!(
thrs_zero.threshold_rational,
BigRational::zero(),
"Threshold should be zero for stake one less than first non-zero for {}",
description
);
} else {
// If first_non_zero_stake is zero, skip this test case or handle appropriately
println!(
"Warning: first_non_zero_stake is zero for {}. Skipping last_zero_stake test.",
description
);
}

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let thrs_first = Threshold::new(first_non_zero_nanomina.clone(), total_currency);
assert!(thrs_first.threshold_rational > BigRational::zero());
let thrs_first = Threshold::new(first_non_zero_stake.clone(), total_currency.clone());
assert!(
thrs_first.threshold_rational > BigRational::zero(),
"Threshold should be non-zero for first non-zero stake for {}",
description
);

let first_non_zero_mina = first_non_zero_nanomina.to_f64().unwrap() / 1_000_000_000.0;
// Convert to MINA for display
let first_non_zero_mina = first_non_zero_stake.to_f64().unwrap() / 1_000_000_000.0;

println!("First non zero stake: {first_non_zero_mina} MINA");
println!(
"First non zero threshold: {}",
thrs_first.threshold_rational.to_f64().unwrap()
);
println!(
"First non-zero stake: {} nanoMINA ({:.6} MINA)",
first_non_zero_stake, first_non_zero_mina
);
println!(
"First non-zero threshold: {:.15}",
thrs_first.threshold_rational.to_f64().unwrap()
);
}
}


#[test]
#[ignore]
fn test_threshold_increase() {
Expand Down