decdn-incentive 0.0.2

Payment channels, bonding, and voucher management for deCDN
Documentation 
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use super::ramped_credit_window;

const FLOOR: u64 = 1024 * 1024; // one 1 MiB chunk
const MAX: u64 = 64 * 1024 * 1024;

#[test]
fn unpaid_stream_sits_at_the_floor() {
    assert_eq!(ramped_credit_window(2, FLOOR, MAX, 0), FLOOR);
}

#[test]
fn window_is_paid_over_divisor_once_it_clears_the_floor() {
    // paid 32 MiB, divisor 2 -> 16 MiB, above the 1 MiB floor.
    assert_eq!(
        ramped_credit_window(2, FLOOR, MAX, 32 * 1024 * 1024),
        16 * 1024 * 1024
    );
}

#[test]
fn window_is_pinned_to_floor_until_paid_exceeds_divisor_times_floor() {
    // paid 1 MiB, divisor 2 -> 512 KiB, below the floor -> floor.
    assert_eq!(ramped_credit_window(2, FLOOR, MAX, 1024 * 1024), FLOOR);
    // And exactly AT `divisor × floor` the ramp still ties the floor, so
    // the clamp — not the ratio — is what decides the boundary.
    assert_eq!(ramped_credit_window(2, FLOOR, MAX, 2 * 1024 * 1024), FLOOR);
}

#[test]
fn window_caps_at_credit_max() {
    // paid 1 GiB, divisor 2 -> 512 MiB, capped to 64 MiB.
    assert_eq!(ramped_credit_window(2, FLOOR, MAX, 1024 * 1024 * 1024), MAX);
}

#[test]
fn divisor_zero_is_instant_full_credit_max() {
    assert_eq!(ramped_credit_window(0, FLOOR, MAX, 0), MAX);
}

#[test]
fn a_credit_max_below_the_floor_never_drops_below_the_floor() {
    // Misconfiguration: ceiling < floor. Progress floor wins.
    assert_eq!(ramped_credit_window(2, FLOOR, 1024, 1_000_000_000), FLOOR);
    assert_eq!(ramped_credit_window(0, FLOOR, 1024, 0), FLOOR);
}