std::pair<T, int> findLocalMin(const Shrinkable<T> &shrinkable,
Predicate pred) {
std::pair<T, int> result(shrinkable.value(), 0);
Seq<Shrinkable<T>> shrinks = shrinkable.shrinks();
Maybe<Shrinkable<T>> shrink;
while ((shrink = shrinks.next())) {
T value = shrink->value();
if (pred(value)) {
result.first = std::move(value);
shrinks = shrink->shrinks();
result.second++;
}
}
return result;
}
bool all(const Shrinkable<T> &shrinkable, Predicate predicate) {
if (!predicate(shrinkable)) {
return false;
}
return seq::all(shrinkable.shrinks(),
[=](const Shrinkable<T> &shrink) {
return shrinkable::all(shrink, predicate);
});
}
std::pair<Shrinkable<CaseDescription>, std::vector<std::size_t>>
shrinkTestCase(const Shrinkable<CaseDescription> &shrinkable,
TestListener &listener) {
std::vector<std::size_t> path;
Shrinkable<CaseDescription> best = shrinkable;
auto shrinks = shrinkable.shrinks();
std::size_t i = 0;
while (auto shrink = shrinks.next()) {
auto caseDescription = shrink->value();
bool accept = caseDescription.result.type == CaseResult::Type::Failure;
listener.onShrinkTried(caseDescription, accept);
if (accept) {
best = std::move(*shrink);
shrinks = best.shrinks();
path.push_back(i);
i = 0;
} else {
i++;
}
}
return std::make_pair(std::move(best), std::move(path));
}
Seq<T> immediateShrinks(const Shrinkable<T> &shrinkable) {
return seq::map(shrinkable.shrinks(),
[](const Shrinkable<T> &shrink) { return shrink.value(); });
}