cranpose 0.1.167

Cranpose runtime and UI facade
Documentation 
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use super::*;

const VSYNC: i64 = 16_666_667;

#[test]
fn a_gap_of_several_vsyncs_keeps_the_period() {
    assert_eq!(
        refine_vsync_period(VSYNC, 2 * VSYNC + 50_000),
        VSYNC + 25_000
    );
    assert_eq!(refine_vsync_period(VSYNC, 3 * VSYNC), VSYNC);
    assert_eq!(refine_vsync_period(VSYNC, VSYNC + 100_000), VSYNC + 100_000);
}

#[test]
fn a_first_gap_spanning_two_vsyncs_is_corrected_by_the_next_single_one() {
    let first = refine_vsync_period(0, 2 * VSYNC);
    assert_eq!(first, 2 * VSYNC);
    assert_eq!(refine_vsync_period(first, VSYNC), VSYNC);
}

#[test]
fn a_display_that_changes_rate_replaces_the_period() {
    let hz_90 = 11_111_111;
    let hz_120 = 8_333_333;
    assert_eq!(refine_vsync_period(VSYNC, hz_90), hz_90);
    assert_eq!(refine_vsync_period(hz_90, VSYNC), VSYNC);
    assert_eq!(refine_vsync_period(VSYNC, hz_120), hz_120);
}

#[test]
fn an_implausible_gap_leaves_the_period_alone() {
    assert_eq!(refine_vsync_period(0, 1_000_000), 0);
    assert_eq!(refine_vsync_period(0, 200_000_000), 0);
    assert_eq!(refine_vsync_period(VSYNC, 1_000_000), VSYNC);
    assert_eq!(refine_vsync_period(VSYNC, 10 * VSYNC), VSYNC);
}