Files
reasampler/tests/test_render_window.cpp
daniel 4c7e0507a1 Fix vacuous bounds test and stale/circular comments from the settle
Replace the self-comparing render-window loop with a genuinely discriminating
floor-vs-exact check; correct two stale claims; mark the Auto/Manual floor-parity
premise as unverified; drop the STARTPOS/ENDPOS comment's circular justification.
2026-08-02 17:08:11 -04:00

480 lines
24 KiB
C++

// Standalone tests for reasampler::render_window — no REAPER, no framework.
// Covers the bounds-equality number (a window's exact frame count at the project
// rate), the verdict the offline backend refuses a capture on, the predicate
// that decides whether REAPER's selected-items render source can express a
// requested window at all, and the millisecond-floor shape a refusal quotes.
#include "../src/core/capture/render_window.h"
#include <cmath>
#include <cstdio>
using namespace reasampler::capture;
static int g_fail = 0;
#define CHECK(cond) do { if(!(cond)) { \
std::printf("FAIL line %d: %s\n", __LINE__, #cond); ++g_fail; } } while(0)
// --- frameCountFor: the bounds equality, stated as a number ------------------
static void testFrameCountIsExactNotRounded() {
// A 1.5 s window at 48 kHz is exactly 72000 frames — the number a capture of
// that range must produce. No rounding slack in either direction.
CHECK(frameCountFor(2.0, 3.5, 48000) == 72000);
// The same duration at a different offset still counts the same frames when
// both edges are frame-aligned.
CHECK(frameCountFor(10.0, 11.5, 48000) == 72000);
// 44.1 kHz: 0.5 s = 22050 frames.
CHECK(frameCountFor(1.0, 1.5, 44100) == 22050);
}
static void testFrameCountIsADifferenceOfIndicesNotADuration() {
// Both edges land mid-frame at 100 Hz (0.005 s = half a frame). Rounding the
// DURATION would give 1 frame; rounding each EDGE gives 0.005 -> frame 1 and
// 0.015 -> frame 2, i.e. 1 frame. Shift the window so the edges round apart
// and the count changes — the property that makes this a window, not a length.
CHECK(frameCountFor(0.005, 0.015, 100) == 1);
CHECK(frameCountFor(0.004, 0.016, 100) == 2);
}
static void testFrameCountRefusesEmptyInvertedAndUnknownRate() {
CHECK(frameCountFor(3.0, 3.0, 48000) == 0); // empty
CHECK(frameCountFor(3.0, 1.0, 48000) == 0); // inverted
CHECK(frameCountFor(1.0, 2.0, 0) == 0); // rate unknown
CHECK(frameCountFor(1.0, 2.0, -1) == 0); // rate nonsensical
}
static void testWindowStartingAtExactlyZero() {
CHECK(frameCountFor(0.0, 1.0, 48000) == 48000);
// The window from the reported blocker: it starts at 0 and its end lands a
// quarter of a frame off the grid at 48 kHz.
CHECK(frameCountFor(0.0, 4.067797, 48000) == 195254);
}
// --- renderHonoredBounds: the gate's verdict ---------------------------------
static void testNonFrameAlignedWindowAcceptsItsAdjacentCounts() {
// 4.067797 s at 48 kHz is 195254.26 frames — not a frame boundary. A correct
// render lands on 195254, and both adjacent counts are inside the gate.
const long long expected = frameCountFor(0.0, 4.067797, 48000);
CHECK(expected == 195254);
CHECK(renderHonoredBounds(expected, 195254));
CHECK(renderHonoredBounds(expected, 195255));
CHECK(renderHonoredBounds(expected, 195253));
// The shortfall actually reported from the DAW is 38 frames — far outside any
// alignment slack, so it is a render that missed the window, and is refused.
CHECK(!renderHonoredBounds(expected, 195216));
}
static void testLengthDerivedAndSameConventionRenderersStayWithinOneFrame() {
// What the one-frame tolerance is actually good for. Two families of renderer are
// inside it at every offset swept here: one that derives its count from the
// window's LENGTH (floor/ceil/round of (end-start)*rate), and one that resolves
// each EDGE to a frame using the SAME convention on both edges. Every count below
// is computed from the window, never from frameCountFor, so this compares two
// derivations rather than restating one. Round-both-edges is omitted deliberately:
// that IS frameCountFor's own convention, so asserting it would be tautological.
//
// 8192 is a power of two, so an eighth of a frame is exact in double there and the
// .5 rounding ties are really hit; at 48000/44100 (the shipping rates) they are
// only approached, which is why all three are swept.
struct Window { double start; double end; };
const int rates[] = {48000, 44100, 8192};
const Window windows[] = {{3.0, 7.5}, {0.0, 4.067797}, {10.25, 10.75}};
for (int rate : rates) {
for (const Window& w : windows) {
for (int s = 0; s < 8; ++s) {
for (int e = 0; e < 8; ++e) {
const double start = w.start + s / (8.0 * rate);
const double end = w.end + e / (8.0 * rate);
const long long expected = frameCountFor(start, end, rate);
const double length = (end - start) * rate;
CHECK(renderHonoredBounds(expected,
static_cast<long long>(std::floor(length))));
CHECK(renderHonoredBounds(expected,
static_cast<long long>(std::ceil(length))));
CHECK(renderHonoredBounds(expected, std::llround(length)));
const double startFrames = start * rate;
const double endFrames = end * rate;
CHECK(renderHonoredBounds(
expected, static_cast<long long>(std::floor(endFrames) -
std::floor(startFrames))));
CHECK(renderHonoredBounds(
expected, static_cast<long long>(std::ceil(endFrames) -
std::ceil(startFrames))));
}
}
}
}
}
static void testMixedEdgeConventionsCanMissByTwoAndAreRefused() {
// The hole in that bound, stated rather than hidden. A renderer that resolves the
// two edges by DIFFERENT conventions lands two frames from frameCountFor's answer
// whenever the start sits past mid-frame and the end before it (resolved outward),
// or the mirror image (resolved inward). The gate refuses both — correctly if
// REAPER derives its count from the window's length, wrongly if it resolves edges
// this way. No unit test can settle which; see render_window.h.
const int rate = 8192; // power of two: the eighth-frame offsets below are exact
// Outward: start .625 into a frame, end .375 into one.
const double start = 10.25 + 5.0 / (8.0 * rate);
const double end = 10.75 + 3.0 / (8.0 * rate);
CHECK(start * rate == 83968.625); // the premise, not an outcome — pinned so a
CHECK(end * rate == 88064.375); // representability slip can't fake the result
const long long expected = frameCountFor(start, end, rate);
CHECK(expected == 4095);
const long long outward = static_cast<long long>(std::ceil(end * rate) -
std::floor(start * rate));
CHECK(outward == 4097);
CHECK(!renderHonoredBounds(expected, outward));
// Inward, mirrored fractions.
const double start2 = 10.25 + 3.0 / (8.0 * rate);
const double end2 = 10.75 + 5.0 / (8.0 * rate);
const long long expected2 = frameCountFor(start2, end2, rate);
CHECK(expected2 == 4097);
const long long inward = static_cast<long long>(std::floor(end2 * rate) -
std::ceil(start2 * rate));
CHECK(inward == 4095);
CHECK(!renderHonoredBounds(expected2, inward));
}
static void testWholeItemWideningIsStillRefused() {
// The defect the gate was built for: a 1 s window inside a 30 s item printing
// the whole item.
const long long expected = frameCountFor(5.0, 6.0, 48000);
CHECK(expected == 48000);
CHECK(!renderHonoredBounds(expected, 30 * 48000));
}
static void testLargeShortfallIsStillRefused() {
const long long expected = frameCountFor(0.0, 4.067797, 48000);
CHECK(!renderHonoredBounds(expected, 190000));
// Two frames is the smallest miss outside the tolerance, in both directions —
// the tolerance is one frame and stays one frame.
CHECK(!renderHonoredBounds(expected, expected - 2));
CHECK(!renderHonoredBounds(expected, expected + 2));
}
static void testEmptyRenderIsRefusedAgainstARealWindow() {
// A render that produced nothing is a bounds miss like any other. A render whose
// frames could not be MEASURED never reaches this predicate — shell/capture/
// render_bounds_gate refuses it before the comparison.
CHECK(!renderHonoredBounds(48000, 0));
}
// --- itemExtentPrintsWindow: can the selected-items source express this? -----
static void testRangeInsideItemCannotBeExpressed() {
// The defect this whole module exists for: a 1 s selection inside a 30 s item.
// The selected-items source would print the item's 30 s, not the 1 s asked for,
// so the capture must NOT take that path.
CHECK(!itemExtentPrintsWindow(5.0, 6.0, /*item*/ 0.0, 30.0, 48000));
}
static void testRangeWiderThanItemCannotBeExpressedEither() {
// The same violation in the other direction: a 10 s selection over a 6 s item
// would print 6 s. Under-printing is a bounds violation exactly as much as
// over-printing is.
CHECK(!itemExtentPrintsWindow(0.0, 10.0, /*item*/ 2.0, 8.0, 48000));
}
static void testEachEdgeAloneDisqualifies() {
// Matching start, drifting end.
CHECK(!itemExtentPrintsWindow(2.0, 8.0, 2.0, 9.0, 48000));
// Matching end, drifting start.
CHECK(!itemExtentPrintsWindow(2.0, 8.0, 1.0, 8.0, 48000));
}
static void testExtentEqualToWindowIsExpressible() {
// The regression floor: a capture whose range IS the item's extent keeps the
// selected-items render, byte-identical to what it produces today.
CHECK(itemExtentPrintsWindow(2.0, 8.0, 2.0, 8.0, 48000));
}
static void testSubFrameDriftStillPrintsTheSameFrames() {
// A time selection snapped a fraction of a sample off the item edge prints the
// identical frames, so it must NOT be pushed onto the time-bounded path — that
// would swap the render mechanism under a capture that was already exact.
const double eighthOfAFrameAt48k = 1.0 / (48000.0 * 8.0);
CHECK(itemExtentPrintsWindow(2.0 + eighthOfAFrameAt48k, 8.0 - eighthOfAFrameAt48k,
2.0, 8.0, 48000));
// A full frame of drift is a real difference and must disqualify.
const double oneFrameAt48k = 1.0 / 48000.0;
CHECK(!itemExtentPrintsWindow(2.0 + oneFrameAt48k, 8.0, 2.0, 8.0, 48000));
}
static void testUnknownRateFallsBackToExactEquality() {
// With no project rate there is no frame grid to compare on. Exact equality
// still recognizes the regression floor...
CHECK(itemExtentPrintsWindow(2.0, 8.0, 2.0, 8.0, 0));
// ...and anything else takes the time-bounded render, which honors the request
// whatever the rate turns out to be.
const double eighthOfAFrameAt48k = 1.0 / (48000.0 * 8.0);
CHECK(!itemExtentPrintsWindow(2.0 + eighthOfAFrameAt48k, 8.0, 2.0, 8.0, 0));
CHECK(!itemExtentPrintsWindow(5.0, 6.0, 0.0, 30.0, 0));
}
static void testMultiItemUnionExtent() {
// Two items spanning 1..4 and 6..9 present a 1..9 union extent to the render.
// A selection over the whole union is expressible; one over only the first
// item's half is not.
CHECK(itemExtentPrintsWindow(1.0, 9.0, 1.0, 9.0, 48000));
CHECK(!itemExtentPrintsWindow(1.0, 4.0, 1.0, 9.0, 48000));
}
// --- msFlooredEndFrameCount: the shape both live short renders had ------------
static void testMillisecondFlooredEndReproducesBothShortRenders() {
// Both DAW observations, as arithmetic. 48 kHz, TailMode::None, start at 0: the
// requested window's count, and the count its end floored to the millisecond
// holds — which is what each render actually printed.
CHECK(frameCountFor(0.0, 4.067797, 48000) == 195254);
CHECK(msFlooredEndFrameCount(0.0, 4.067797, 48000) == 195216);
CHECK(frameCountFor(0.0, 4.067797, 48000) -
msFlooredEndFrameCount(0.0, 4.067797, 48000) == 38);
CHECK(frameCountFor(0.0, 1.655172, 48000) == 79448);
CHECK(msFlooredEndFrameCount(0.0, 1.655172, 48000) == 79440);
CHECK(frameCountFor(0.0, 1.655172, 48000) -
msFlooredEndFrameCount(0.0, 1.655172, 48000) == 8);
}
static void testTheSixDecimalDisplayDidNotCreateTheEffect() {
// Both reported ends were printed to six decimals by the refusal. Each is one 4/4
// bar — at 59 BPM and at 145 BPM — so the full-precision doubles behind them are
// 240/59 and 240/145. Same counts either way: the display rounding is not what
// produces the shortfall.
CHECK(frameCountFor(0.0, 240.0 / 59.0, 48000) == 195254);
CHECK(msFlooredEndFrameCount(0.0, 240.0 / 59.0, 48000) == 195216);
CHECK(frameCountFor(0.0, 240.0 / 145.0, 48000) == 79448);
CHECK(msFlooredEndFrameCount(0.0, 240.0 / 145.0, 48000) == 79440);
}
static void testWindowAlreadyOnTheMillisecondGridLosesNothing() {
// The "sometimes it works" case: a bar at 120 BPM is exactly 2 s.
CHECK(msFlooredEndFrameCount(0.0, 2.0, 48000) == frameCountFor(0.0, 2.0, 48000));
// The binary-representation trap a bare floor would fall into. The premise, not an
// outcome: 1.007 s is a whole millisecond that really does land BELOW 1007 ms in
// double, so flooring it without a tolerance drops a millisecond from a window
// already on the grid.
CHECK(1.007 * 1000.0 < 1007.0);
CHECK(frameCountFor(0.0, 1.007, 48000) == 48336);
CHECK(msFlooredEndFrameCount(0.0, 1.007, 48000) == 48336);
// Same end reached from a non-zero start, so nothing here rests on the window
// beginning at 0.
CHECK(msFlooredEndFrameCount(0.5, 1.007, 48000) ==
frameCountFor(0.5, 1.007, 48000));
}
static void testOneFrameOfRemainderStillFloors() {
// The whole-millisecond tolerance must sit far below a frame, or it would swallow
// the very remainder this diagnostic exists to find. A remainder JUST BELOW a
// millisecond boundary is the discriminating case: one frame short of 1.0 s is
// 999.979166 ms, only ~0.0208 ms off the next whole millisecond. The shipped
// nanosecond tolerance still floors it down; a tolerance any wider than ~0.021 ms
// would snap it up to the millisecond instead and this test would then see 48000,
// not 47952 — which is what would fail if the tolerance regressed to something
// that wide.
const double oneFrame = 1.0 / 48000.0;
CHECK(frameCountFor(0.0, 1.0 - oneFrame, 48000) == 47999);
CHECK(msFlooredEndFrameCount(0.0, 1.0 - oneFrame, 48000) == 47952);
}
static void testMillisecondFloorAt44100WhereAMillisecondIsNotWholeFrames() {
// 44.1 kHz: a millisecond is 44.1 frames, so a floored end cannot be described as
// dropping a whole number of frames — the count still resolves exactly.
CHECK(frameCountFor(0.0, 0.0105, 44100) == 463);
CHECK(msFlooredEndFrameCount(0.0, 0.0105, 44100) == 441);
// And a window that IS on the millisecond grid there is untouched, even though its
// edge is not on a frame boundary.
CHECK(frameCountFor(0.0, 0.010, 44100) == 441);
CHECK(msFlooredEndFrameCount(0.0, 0.010, 44100) == 441);
}
static void testASubMillisecondStartWouldNotHideItself() {
// Both observations started at 0.000000s, the one value that hides a start-side
// truncation. A window whose START carries a sub-millisecond remainder counts from
// that exact start...
const double start = 1.0001724, end = 2.0001724;
CHECK(frameCountFor(start, end, 48000) == 48000);
// ...so a start floored to the millisecond would print a DIFFERENT count — 8 frames
// more, the same remainder the second observation lost off its end. A start-side
// truncation is therefore visible to the same frame-count gate, not silent.
CHECK(frameCountFor(1.000, end, 48000) == 48008);
CHECK(!renderHonoredBounds(frameCountFor(start, end, 48000),
frameCountFor(1.000, end, 48000)));
}
static void testTheTwoLiveShortRendersPinnedAtFullPrecision() {
// 1.6551724137931001 is the console's own %.17g read-back. 4.0677966101694913 is
// the double nearest the six-decimal value (4.067797) the earlier refusal actually
// printed -- that refusal predates the %.17g printer (git history has no commit
// introducing this literal as a console value), so it is a reconstruction, not a
// captured one. 240/145 and 240/59 (testTheSixDecimalDisplayDidNotCreateTheEffect)
// produce the SAME counts as the literals here, so this test cannot distinguish the
// real value from the reconstruction either -- it pins the count regression (full
// precision or six-decimal input, the frame counts agree), not which double REAPER
// was really handed.
CHECK(frameCountFor(0.0, 1.6551724137931001, 48000) == 79448);
CHECK(msFlooredEndFrameCount(0.0, 1.6551724137931001, 48000) == 79440);
CHECK(frameCountFor(0.0, 4.0677966101694913, 48000) == 195254);
CHECK(msFlooredEndFrameCount(0.0, 4.0677966101694913, 48000) == 195216);
// And the counts REAPER produced are outside the gate's tolerance in both cases —
// the refusals were correct, not an artifact of the one-frame slack.
CHECK(!renderHonoredBounds(79448, 79440));
CHECK(!renderHonoredBounds(195254, 195216));
}
// --- isOnMillisecondGrid: whether an observation can speak to an edge ----------
static void testOnGridRecognizesWholeMillisecondsIncludingTheBinaryTrap() {
CHECK(isOnMillisecondGrid(0.0));
CHECK(isOnMillisecondGrid(2.0));
CHECK(isOnMillisecondGrid(0.001));
// 1.007 s does not multiply to exactly 1007.0 in double (pinned as the premise in
// testWindowAlreadyOnTheMillisecondGridLosesNothing) and must still read as on-grid.
CHECK(isOnMillisecondGrid(1.007));
// A whole millisecond at 44.1 kHz is 44.1 frames — off the frame grid, on this one.
CHECK(isOnMillisecondGrid(0.010));
}
static void testOffGridRecognizesASubMillisecondRemainder() {
CHECK(!isOnMillisecondGrid(1.6551724137931001));
CHECK(!isOnMillisecondGrid(1.0001724));
// One frame short of a whole second at 48 kHz is ~0.0208 ms off the grid — the
// tightest remainder this predicate has to keep seeing.
CHECK(!isOnMillisecondGrid(1.0 - 1.0 / 48000.0));
}
// --- the settled time-selection observations, as pure arithmetic ---------------
//
// Two live 48 kHz TailMode::None renders on RENDER_BOUNDSFLAG=2 came back EXACT at
// 97627 frames. The console printed run TWO's start verbatim (2.0338983050847457s);
// run ONE started at 0s and its end was never printed, so the value below is a
// reconstruction from run two's own printed start — it pins the count, not which
// double REAPER was handed.
static void testTheSettledExactRenderOnTheOnGridStart() {
CHECK(frameCountFor(0.0, 2.0338983050847457, 48000) == 97627);
// Run one could not test the START: 0s is on the grid, which floor, ceil and round
// all leave alone, so a start-flooring render prints the identical count.
CHECK(isOnMillisecondGrid(0.0));
// Its END, though, WAS under test — a floored end would have printed 43 frames fewer.
CHECK(msFlooredEndFrameCount(0.0, 2.0338983050847457, 48000) == 97584);
CHECK(!renderHonoredBounds(97627, 97584));
}
static void testTheSettledExactRenderTestedBothEdges() {
// Run two: both edges carry a sub-millisecond remainder, and the render still
// printed the window's exact count.
const double start = 2.0338983050847457, end = 4.0677966101694913;
CHECK(!isOnMillisecondGrid(start));
CHECK(!isOnMillisecondGrid(end));
CHECK(frameCountFor(start, end, 48000) == 97627);
// What makes that EXACT proof rather than a coincidence: NO millisecond-floored
// model of this window reproduces 97627, and every one of them sits outside the
// gate's one-frame tolerance. This is the assertion the whole experiment rests on.
const long long startAlone = frameCountFor(2.033, end, 48000);
const long long endAlone = frameCountFor(start, 4.067, 48000);
const long long bothTogether = frameCountFor(2.033, 4.067, 48000);
CHECK(startAlone == 97670);
CHECK(endAlone == 97589);
CHECK(bothTogether == 97632);
CHECK(!renderHonoredBounds(97627, startAlone));
CHECK(!renderHonoredBounds(97627, endAlone));
CHECK(!renderHonoredBounds(97627, bothTogether));
}
static void testOnAndOffGridWindowsAreHonoredIdentically() {
// Nothing on the settled path may treat a grid-aligned window differently from one
// carrying a remainder — the whole point of leaving the flooring channel behind.
const double onStart = 1.000, onEnd = 2.000;
const double offStart = 1.0001724, offEnd = 2.0001724;
CHECK(isOnMillisecondGrid(onStart));
CHECK(isOnMillisecondGrid(onEnd));
CHECK(!isOnMillisecondGrid(offStart));
CHECK(!isOnMillisecondGrid(offEnd));
const long long on = frameCountFor(onStart, onEnd, 48000);
const long long off = frameCountFor(offStart, offEnd, 48000);
CHECK(on == 48000);
CHECK(off == 48000);
// The discriminating half: a render that landed the FLOORED count would be
// refused on the off-grid window (47992 against the required 48000, an
// 8-frame gap) but honored on the on-grid one, where flooring changes
// nothing. If the floor ever came back on the settled path, this is what
// would start failing.
const long long offFloored = msFlooredEndFrameCount(offStart, offEnd, 48000);
const long long onFloored = msFlooredEndFrameCount(onStart, onEnd, 48000);
CHECK(offFloored == 47992);
CHECK(onFloored == on);
CHECK(!renderHonoredBounds(off, offFloored));
CHECK(renderHonoredBounds(on, onFloored));
}
static void testOnAndOffGridAt44100WhereAMillisecondIsNotWholeFrames() {
// 44.1 kHz: a millisecond is 44.1 frames, so a grid-aligned window's edges are NOT
// frame-aligned. The exact counts must still be exact and the two must still be
// judged identically.
const double onStart = 1.000, onEnd = 2.000;
const double offStart = 1.0001724, offEnd = 2.0001724;
const long long on = frameCountFor(onStart, onEnd, 44100);
const long long off = frameCountFor(offStart, offEnd, 44100);
CHECK(on == 44100);
CHECK(off == 44100);
const long long offFloored = msFlooredEndFrameCount(offStart, offEnd, 44100);
const long long onFloored = msFlooredEndFrameCount(onStart, onEnd, 44100);
CHECK(offFloored == 44092);
CHECK(onFloored == on);
// Same discriminating pair as the 48 kHz case: the floor would be caught
// off-grid and invisible on-grid, even where the grid itself isn't frame-aligned.
CHECK(!renderHonoredBounds(off, offFloored));
CHECK(renderHonoredBounds(on, onFloored));
}
int main() {
testFrameCountIsExactNotRounded();
testFrameCountIsADifferenceOfIndicesNotADuration();
testFrameCountRefusesEmptyInvertedAndUnknownRate();
testWindowStartingAtExactlyZero();
testNonFrameAlignedWindowAcceptsItsAdjacentCounts();
testLengthDerivedAndSameConventionRenderersStayWithinOneFrame();
testMixedEdgeConventionsCanMissByTwoAndAreRefused();
testWholeItemWideningIsStillRefused();
testLargeShortfallIsStillRefused();
testEmptyRenderIsRefusedAgainstARealWindow();
testRangeInsideItemCannotBeExpressed();
testRangeWiderThanItemCannotBeExpressedEither();
testEachEdgeAloneDisqualifies();
testExtentEqualToWindowIsExpressible();
testSubFrameDriftStillPrintsTheSameFrames();
testUnknownRateFallsBackToExactEquality();
testMultiItemUnionExtent();
testMillisecondFlooredEndReproducesBothShortRenders();
testTheSixDecimalDisplayDidNotCreateTheEffect();
testWindowAlreadyOnTheMillisecondGridLosesNothing();
testOneFrameOfRemainderStillFloors();
testMillisecondFloorAt44100WhereAMillisecondIsNotWholeFrames();
testASubMillisecondStartWouldNotHideItself();
testTheTwoLiveShortRendersPinnedAtFullPrecision();
testOnGridRecognizesWholeMillisecondsIncludingTheBinaryTrap();
testOffGridRecognizesASubMillisecondRemainder();
testTheSettledExactRenderOnTheOnGridStart();
testTheSettledExactRenderTestedBothEdges();
testOnAndOffGridWindowsAreHonoredIdentically();
testOnAndOffGridAt44100WhereAMillisecondIsNotWholeFrames();
if (g_fail) { std::printf("%d check(s) FAILED\n", g_fail); return 1; }
std::printf("render_window: all checks passed\n");
return 0;
}