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test.cpp
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test.cpp
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#include <initializer_list>
#include <vector>
#define private public
#define protected public
#include "rangeset.hpp"
#undef private
#undef protected
#include <ostream>
template <typename T, bool B>
inline std::ostream& _helper1 ( std::ostream& os, typename RangeSet<T, B>::const_iterator const& it ) {
if(it.lower == it.end){
return os << "{END iterator}";
}
else {
return os << "(" << it->first << ", " << it->second << ")";
}
}
std::ostream& operator<< ( std::ostream& os, typename RangeSet<int, true>::const_iterator const& it ) {
return _helper1<int, true>(os, it);
}
std::ostream& operator<< ( std::ostream& os, typename RangeSet<int, false>::const_iterator const& it ) {
return _helper1<int, false>(os, it);
}
#define CATCH_CONFIG_ENABLE_PAIR_STRINGMAKER
#include "hl037-test/include/hl037/test.hpp"
namespace test_rangeset{
template <typename T, bool B>
void assert_rangeset_equals(const std::initializer_list<std::pair<T, T> > & expected, const RangeSet<T, B> & set){
REQUIRE(expected.size() == set.size());
auto && it1 = expected.begin(), end1 = expected.end();
auto && it2 = set.cbegin(), end2 = set.cend();
for(; it1 != end1 && it2 != end2; ++it1, ++it2) {
REQUIRE(it2->first == it1->first);
REQUIRE(it2->second == it1->second);
}
}
template <typename T, bool B>
void assert_state(const RangeSet<T, B> & set){
REQUIRE(set.data.size() % 2 == 0 );
if(set.data.size() % 2){
return;
}
auto && it = set.data.begin(), end = set.data.end();
while(it != end) {
REQUIRE((int) it++->dir == (int) RangeSet<T, B>::end_point_t::LOWER);
REQUIRE((int) it++->dir == (int) RangeSet<T, B>::end_point_t::UPPER);
}
}
struct insert {
struct param_t {
const char * name;
const std::initializer_list<std::pair<int, int> > inserted;
const std::initializer_list<std::pair<int, int> > expected;
};
static constexpr param_t simple[] = {
//////// SIMPLE ////////
{
"Empty is Empty",
{},
{}
},
{
"Empty inserted to Empty is still Empty",
{{5, 5}},
{}
},
{
"Insert one element",
{{10, 20}},
{{10, 20}}
},
{
"Insert 2 elements",
{{10, 20}, {30, 40}},
{{10, 20}, {30, 40}},
},
{
"Change order",
{{30, 40}, {10, 20}},
{{10, 20}, {30, 40}},
},
};
static constexpr param_t common[] = {
//////// COMMON ////////
{
"Base for other tests + insert at end",
{{10, 20}, {30, 40}, {50, 60}},
{{10, 20}, {30, 40}, {50, 60}},
},
{
"Insert at start",
{{10, 20}, {30, 40}, {50, 60}, {2, 8}},
{{2, 8}, {10, 20}, {30, 40}, {50, 60}},
},
{
"Insert empty",
{{10, 20}, {30, 40}, {50, 60}, {2, 2}},
{{10, 20}, {30, 40}, {50, 60}},
},
{
"Insert empty middle",
{{10, 20}, {30, 40}, {50, 60}, {23, 23}},
{{10, 20}, {30, 40}, {50, 60}},
},
{
"Insert empty, then insert",
{{10, 20}, {2, 2}, {30, 40}, {50, 60}},
{{10, 20}, {30, 40}, {50, 60}},
},
{
"Insert empty middle, then insert",
{{10, 20}, {23, 23}, {30, 40}, {50, 60}},
{{10, 20}, {30, 40}, {50, 60}},
},
{
"Insert inside range does nothing",
{{10, 20}, {30, 40}, {50, 60}, {32, 38}},
{{10, 20}, {30, 40}, {50, 60}},
},
{
"Insert middle",
{{10, 20}, {30, 40}, {50, 60}, {23, 25}},
{{10, 20}, {23, 25}, {30, 40}, {50, 60}},
},
{
"Start overlap, begin",
{{10, 20}, {30, 40}, {50, 60}, {5, 11}},
{{5 , 20}, {30, 40}, {50, 60}},
},
{
"Start overlap, middle",
{{10, 20}, {30, 40}, {50, 60}, {25, 31}},
{{10, 20}, {25, 40}, {50, 60}},
},
{
"Start overlap, end",
{{10, 20}, {30, 40}, {50, 60}, {45, 51}},
{{10, 20}, {30, 40}, {45, 60}},
},
{
"End overlap, begin",
{{10, 20}, {30, 40}, {50, 60}, {19, 25}},
{{10, 25}, {30, 40}, {50, 60}},
},
{
"End overlap, middle",
{{10, 20}, {30, 40}, {50, 60}, {39, 45}},
{{10, 20}, {30, 45}, {50, 60}},
},
{
"End overlap, end",
{{10, 20}, {30, 40}, {50, 60}, {59, 65}},
{{10, 20}, {30, 40}, {50, 65}},
},
{
"Both overlap, begin",
{{10, 20}, {30, 40}, {50, 60}, {9, 21}},
{{9 , 21}, {30, 40}, {50, 60}},
},
{
"Both overlap, middle",
{{10, 20}, {30, 40}, {50, 60}, {29, 41}},
{{10, 20}, {29, 41}, {50, 60}},
},
{
"Both overlap, end",
{{10, 20}, {30, 40}, {50, 60}, {49, 61}},
{{10, 20}, {30, 40}, {49, 61}},
},
{
"Join begin",
{{10, 20}, {30, 40}, {50, 60}, {19, 31}},
{{10, 40}, {50, 60}},
},
{
"Join end",
{{10, 20}, {30, 40}, {50, 60}, {39, 51}},
{{10, 20}, {30, 60}},
},
{
"Join all",
{{10, 20}, {30, 40}, {50, 60}, {19, 51}},
{{10, 60}},
},
{
"Join more start, begin",
{{10, 20}, {30, 40}, {50, 60}, {9, 31}},
{{ 9, 40}, {50, 60}},
},
{
"Join more start, end",
{{10, 20}, {30, 40}, {50, 60}, {29, 51}},
{{10, 20}, {29, 60}},
},
{
"Join more end, begin",
{{10, 20}, {30, 40}, {50, 60}, {11, 41}},
{{10, 41}, {50, 60}},
},
{
"Join more end, end",
{{10, 20}, {30, 40}, {50, 60}, {31, 61}},
{{10, 20}, {30, 61}},
},
{
"Join more both, begin",
{{10, 20}, {30, 40}, {50, 60}, {9, 41}},
{{9, 41}, {50, 60}},
},
{
"Join more both, end",
{{10, 20}, {30, 40}, {50, 60}, {29, 61}},
{{10, 20}, {29, 61}},
},
{
"Join more both, all",
{{10, 20}, {30, 40}, {50, 60}, {9, 61}},
{{ 9, 61}},
},
};
static constexpr param_t merge_touching[] = {
//////// MERGE_TOUCHING ////////
{
"Join begin",
{{10, 20}, {30, 40}, {50, 60}, {20, 30}},
{{10, 40}, {50, 60}},
},
{
"Join end",
{{10, 20}, {30, 40}, {50, 60}, {40, 50}},
{{10, 20}, {30, 60}},
},
{
"Join all",
{{10, 20}, {30, 40}, {50, 60}, {20, 50}},
{{10, 60}},
},
{
"Join more start, begin",
{{10, 20}, {30, 40}, {50, 60}, {9, 30}},
{{ 9, 40}, {50, 60}},
},
{
"Join more start, end",
{{10, 20}, {30, 40}, {50, 60}, {29, 50}},
{{10, 20}, {29, 60}},
},
{
"Join more end, begin",
{{10, 20}, {30, 40}, {50, 60}, {20, 41}},
{{10, 41}, {50, 60}},
},
{
"Join more end, end",
{{10, 20}, {30, 40}, {50, 60}, {40, 61}},
{{10, 20}, {30, 61}},
},
{
"Join more both, begin",
{{10, 20}, {30, 40}, {50, 60}, {9, 41}},
{{9, 41}, {50, 60}},
},
{
"Join more both, end",
{{10, 20}, {30, 40}, {50, 60}, {29, 61}},
{{10, 20}, {29, 61}},
},
};
static constexpr param_t keep_touching[] = {
//////// KEEP_TOUCHING ////////
{
"Do not Join begin",
{{10, 20}, {30, 40}, {50, 60}, {20, 30}},
{{10, 20}, {20, 30}, {30, 40}, {50, 60}},
},
{
"Do not Join end",
{{10, 20}, {30, 40}, {50, 60}, {40, 50}},
{{10, 20}, {30, 40}, {40, 50}, {50, 60}},
},
{
"Do not Join all",
{{10, 20}, {30, 40}, {50, 60}, {20, 50}},
{{10, 20}, {20, 50}, {50, 60}},
},
{
"Do not Join more start, begin",
{{10, 20}, {30, 40}, {50, 60}, {9, 30}},
{{ 9, 30}, {30, 40}, {50, 60}},
},
{
"Do not Join more start, end",
{{10, 20}, {30, 40}, {50, 60}, {29, 50}},
{{10, 20}, {29, 50}, {50, 60}},
},
{
"Do not Join more end, begin",
{{10, 20}, {30, 40}, {50, 60}, {20, 41}},
{{10, 20}, {20, 41}, {50, 60}},
},
{
"Do not Join more end, end",
{{10, 20}, {30, 40}, {50, 60}, {40, 61}},
{{10, 20}, {30, 40}, {40, 61}},
},
{
"Join end points, begin",
{{10, 20}, {30, 40}, {50, 60}, {10, 40}},
{{10, 40}, {50, 60}},
},
{
"Join end points, end",
{{10, 20}, {30, 40}, {50, 60}, {30, 60}},
{{10, 20}, {30, 60}},
},
{
"Join more both, begin",
{{10, 20}, {30, 40}, {50, 60}, {9, 41}},
{{9, 41}, {50, 60}},
},
{
"Join more both, end",
{{10, 20}, {30, 40}, {50, 60}, {29, 61}},
{{10, 20}, {29, 61}},
},
};
template<typename T, bool B>
static void test(const param_t & param, RangeSet<T, B> & set){
for(auto && p:param.inserted){
set.insert(p);
}
assert_state(set);
assert_rangeset_equals(param.expected, set);
}
};
struct remove {
struct param_t {
const char * name;
const std::initializer_list<std::pair<int, int> > inserted;
const std::initializer_list<std::pair<int, int> > removed;
const std::initializer_list<std::pair<int, int> > expected;
};
static constexpr param_t trivial[] = {
{
"Remove nothing to nothing is still nothing",
{},
{},
{},
},
{
"Remove anything to nothing is still nothing",
{},
{{10, 20}},
{},
},
{
"Remove multiple anything to nothing is still nothing",
{},
{{10, 20}, {20, 30}},
{},
},
};
static constexpr param_t one_range[] = {
{
"Remove before",
{{10, 20}},
{{2, 8}},
{{10, 20}},
},
{
"Remove after",
{{10, 20}},
{{25, 30}},
{{10, 20}},
},
{
"Remove touching before",
{{10, 20}},
{{8, 10}},
{{10, 20}},
},
{
"Remove touching after",
{{10, 20}},
{{20, 22}},
{{10, 20}},
},
{
"Remove middle",
{{10, 20}},
{{12, 18}},
{{10, 12}, {18, 20}},
},
{
"Remove overlap before",
{{10, 20}},
{{5, 12}},
{{12, 20}},
},
{
"Remove overlap after",
{{10, 20}},
{{18, 25}},
{{10, 18}},
},
{
"Remove exact begin",
{{10, 20}},
{{10, 12}},
{{12, 20}},
},
{
"Remove exact end",
{{10, 20}},
{{18, 20}},
{{10, 18}},
},
{
"Remove exact",
{{10, 20}},
{{10, 20}},
{},
},
{
"Remove contained",
{{10, 20}},
{{8, 22}},
{},
},
};
static constexpr param_t three_ranges[] = {
{
"Remove begin overlap",
{{10, 20}, {30, 40}, {50, 60}},
{{8, 22}},
{{30, 40}, {50, 60}},
},
{
"Remove begin exact",
{{10, 20}, {30, 40}, {50, 60}},
{{10, 20}},
{{30, 40}, {50, 60}},
},
{
"Remove end exact",
{{10, 20}, {30, 40}, {50, 60}},
{{50, 60}},
{{10, 20}, {30, 40}},
},
{
"Remove middle overlap",
{{10, 20}, {30, 40}, {50, 60}},
{{28, 42}},
{{10, 20}, {50, 60}},
},
{
"Remove end overlap",
{{10, 20}, {30, 40}, {50, 60}},
{{48, 62}},
{{10, 20}, {30, 40}},
},
{
"Remove middle begin",
{{10, 20}, {30, 40}, {50, 60}},
{{22, 28}},
{{10, 20}, {30, 40}, {50, 60}},
},
{
"Remove middle end",
{{10, 20}, {30, 40}, {50, 60}},
{{42, 48}},
{{10, 20}, {30, 40}, {50, 60}},
},
{
"Remove middle touching before, begin",
{{10, 20}, {30, 40}, {50, 60}},
{{20, 28}},
{{10, 20}, {30, 40}, {50, 60}},
},
{
"Remove middle touching after, begin",
{{10, 20}, {30, 40}, {50, 60}},
{{22, 30}},
{{10, 20}, {30, 40}, {50, 60}},
},
{
"Remove middle touching both, begin",
{{10, 20}, {30, 40}, {50, 60}},
{{20, 30}},
{{10, 20}, {30, 40}, {50, 60}},
},
{
"Remove middle touching before, end",
{{10, 20}, {30, 40}, {50, 60}},
{{40, 48}},
{{10, 20}, {30, 40}, {50, 60}},
},
{
"Remove middle touching after, end",
{{10, 20}, {30, 40}, {50, 60}},
{{42, 50}},
{{10, 20}, {30, 40}, {50, 60}},
},
{
"Remove middle touching both, end",
{{10, 20}, {30, 40}, {50, 60}},
{{40, 50}},
{{10, 20}, {30, 40}, {50, 60}},
},
{
"Remove middle overlap before, begin",
{{10, 20}, {30, 40}, {50, 60}},
{{18, 28}},
{{10, 18}, {30, 40}, {50, 60}},
},
{
"Remove middle overlap after, begin",
{{10, 20}, {30, 40}, {50, 60}},
{{22, 32}},
{{10, 20}, {32, 40}, {50, 60}},
},
{
"Remove middle overlap both, begin",
{{10, 20}, {30, 40}, {50, 60}},
{{18, 32}},
{{10, 18}, {32, 40}, {50, 60}},
},
{
"Remove middle overlap before, end",
{{10, 20}, {30, 40}, {50, 60}},
{{38, 48}},
{{10, 20}, {30, 38}, {50, 60}},
},
{
"Remove middle overlap after, end",
{{10, 20}, {30, 40}, {50, 60}},
{{42, 52}},
{{10, 20}, {30, 40}, {52, 60}},
},
{
"Remove middle overlap both, end",
{{10, 20}, {30, 40}, {50, 60}},
{{38, 52}},
{{10, 20}, {30, 38}, {52, 60}},
},
// REMOVE MIDDLE
{
"Remove middle exact",
{{10, 20}, {30, 40}, {50, 60}},
{{30, 40}},
{{10, 20}, {50, 60}},
},
{
"Remove middle exact overlap",
{{10, 20}, {30, 40}, {50, 60}},
{{30, 42}},
{{10, 20}, {50, 60}},
},
{
"Remove middle overlap exact",
{{10, 20}, {30, 40}, {50, 60}},
{{28, 40}},
{{10, 20}, {50, 60}},
},
{
"Remove middle overlap overlap",
{{10, 20}, {30, 40}, {50, 60}},
{{28, 42}},
{{10, 20}, {50, 60}},
},
// REMOVE MIDDLE BEGIN
{
"Remove middle exact, exact previous",
{{10, 20}, {30, 40}, {50, 60}},
{{20, 40}},
{{10, 20}, {50, 60}},
},
{
"Remove middle overlap, exact previous",
{{10, 20}, {30, 40}, {50, 60}},
{{20, 42}},
{{10, 20}, {50, 60}},
},
{
"Remove middle exact, overlap previous",
{{10, 20}, {30, 40}, {50, 60}},
{{18, 40}},
{{10, 18}, {50, 60}},
},
{
"Remove middle overlap, overlap previous",
{{10, 20}, {30, 40}, {50, 60}},
{{18, 42}},
{{10, 18}, {50, 60}},
},
// REMOVE MIDDLE END
{
"Remove middle exact, exact next",
{{10, 20}, {30, 40}, {50, 60}},
{{30, 50}},
{{10, 20}, {50, 60}},
},
{
"Remove middle overlap, exact next",
{{10, 20}, {30, 40}, {50, 60}},
{{28, 50}},
{{10, 20}, {50, 60}},
},
{
"Remove middle exact, overlap next",
{{10, 20}, {30, 40}, {50, 60}},
{{30, 52}},
{{10, 20}, {52, 60}},
},
{
"Remove middle overlap, overlap next",
{{10, 20}, {30, 40}, {50, 60}},
{{28, 52}},
{{10, 20}, {52, 60}},
},
// REMOVE MIDDLE BOTH
{
"Remove middle exact previous, exact next",
{{10, 20}, {30, 40}, {50, 60}},
{{20, 50}},
{{10, 20}, {50, 60}},
},
{
"Remove middle overlap previous, exact next",
{{10, 20}, {30, 40}, {50, 60}},
{{18, 50}},
{{10, 18}, {50, 60}},
},
{
"Remove middle exact previous, overlap next",
{{10, 20}, {30, 40}, {50, 60}},
{{20, 52}},
{{10, 20}, {52, 60}},
},
{
"Remove middle overlap previous, overlap next",
{{10, 20}, {30, 40}, {50, 60}},
{{18, 52}},
{{10, 18}, {52, 60}},
},
{
"Remove all exact exact",
{{10, 20}, {30, 40}, {50, 60}},
{{10, 60}},
{},
},
{
"Remove all overlap exact",
{{10, 20}, {30, 40}, {50, 60}},
{{8, 60}},
{},
},
{
"Remove all exact overlap",
{{10, 20}, {30, 40}, {50, 60}},
{{10, 62}},
{},
},
{
"Remove all overlap overlap",
{{10, 20}, {30, 40}, {50, 60}},
{{8, 62}},
{},
},
// REMOVE BEGIN MIDDLE
{
"Remove begin exact, exact after",
{{10, 20}, {30, 40}, {50, 60}},
{{10, 30}},
{{30, 40}, {50, 60}},
},
{
"Remove begin overlap, exact after",
{{10, 20}, {30, 40}, {50, 60}},
{{8, 30}},
{{30, 40}, {50, 60}},
},
{
"Remove begin exact, overlap after",
{{10, 20}, {30, 40}, {50, 60}},
{{10, 32}},
{{32, 40}, {50, 60}},
},
{
"Remove begin overlap, overlap after",
{{10, 20}, {30, 40}, {50, 60}},
{{8, 32}},
{{32, 40}, {50, 60}},
},
{
"Remove begin middle exact, exact after",
{{10, 20}, {30, 40}, {50, 60}},
{{10, 40}},
{{50, 60}},
},
{
"Remove begin middle overlap, exact after",
{{10, 20}, {30, 40}, {50, 60}},
{{8, 40}},
{{50, 60}},
},
{
"Remove begin middle exact, overlap after",
{{10, 20}, {30, 40}, {50, 60}},
{{10, 42}},
{{50, 60}},
},
{
"Remove begin middle overlap, overlap after",
{{10, 20}, {30, 40}, {50, 60}},
{{8, 42}},
{{50, 60}},
},
{
"Remove begin middle exact, exact next",
{{10, 20}, {30, 40}, {50, 60}},
{{10, 50}},
{{50, 60}},
},
{
"Remove begin middle overlap, exact next",
{{10, 20}, {30, 40}, {50, 60}},
{{8, 50}},
{{50, 60}},
},
{
"Remove begin middle exact, overlap next",
{{10, 20}, {30, 40}, {50, 60}},
{{10, 52}},
{{52, 60}},
},
{
"Remove begin middle overlap, overlap next",
{{10, 20}, {30, 40}, {50, 60}},
{{8, 52}},
{{52, 60}},
},
// REMOVE END MIDDLE
{
"Remove end exact, exact before",
{{10, 20}, {30, 40}, {50, 60}},
{{40, 60}},
{{10, 20}, {30, 40}},
},
{
"Remove end overlap, exact before",
{{10, 20}, {30, 40}, {50, 60}},
{{40, 62}},
{{10, 20}, {30, 40}},
},
{
"Remove end exact, overlap before",
{{10, 20}, {30, 40}, {50, 60}},
{{38, 60}},
{{10, 20}, {30, 38}},
},
{
"Remove end overlap, overlap before",
{{10, 20}, {30, 40}, {50, 60}},
{{38, 62}},
{{10, 20}, {30, 38}},
},
{
"Remove end middle exact, exact before",
{{10, 20}, {30, 40}, {50, 60}},
{{30, 60}},
{{10, 20}},
},
{
"Remove end middle overlap, exact before",
{{10, 20}, {30, 40}, {50, 60}},
{{30, 62}},
{{10, 20}},
},
{
"Remove end middle exact, overlap before",
{{10, 20}, {30, 40}, {50, 60}},
{{28, 60}},
{{10, 20}},
},
{
"Remove end middle overlap, overlap before",
{{10, 20}, {30, 40}, {50, 60}},
{{28, 62}},
{{10, 20}},
},
{
"Remove end middle exact, exact previous",
{{10, 20}, {30, 40}, {50, 60}},
{{20, 60}},
{{10, 20}},
},
{
"Remove end middle overlap, exact previous",
{{10, 20}, {30, 40}, {50, 60}},
{{20, 62}},
{{10, 20}},
},
{
"Remove end middle exact, overlap previous",
{{10, 20}, {30, 40}, {50, 60}},
{{18, 60}},
{{10, 18}},
},
{
"Remove end middle overlap, overlap previous",
{{10, 20}, {30, 40}, {50, 60}},
{{18, 62}},
{{10, 18}},
},
};
template<typename T, bool B>
static void test(const param_t & param, RangeSet<T, B> & set){
for(auto && p:param.inserted){
set.insert(p);
}
for(auto && p:param.removed){
set.remove(p);
}
assert_state(set);
assert_rangeset_equals(param.expected, set);
}
};
DECLARE_PARAMS_SECTION(find1){
DECLARE_PARAM_TYPE{
const char * name;
const std::initializer_list<std::pair<int, int> > inserted;
const int searched;
const std::pair<int, int> expected; // (-1, -1) = end()
};
DECLARE_DATA_CASE(simple) {
{
"Empty no find",
{},
42,
{-1,-1}
},
{
"Before",
{{10, 20}},
5,
{-1,-1}
},
{
"After",
{{10, 20}},
25,
{-1,-1}
},
{
"Inside",
{{10, 20}},
15,
{10,20}
},
{
"Start",
{{10, 20}},
10,
{10,20}
},
{
"End",
{{10, 20}},
20,
{-1,-1}
},
};
DECLARE_DATA_CASE(three_ranges) {
// START
{
"start, Before",
{{10, 20}, {30, 40}, {50, 60}},
5,
{-1,-1}
},
{
"start, After",
{{10, 20}, {30, 40}, {50, 60}},
25,
{-1,-1}
},
{
"start, Inside",
{{10, 20}, {30, 40}, {50, 60}},
15,
{10,20}
},
{
"start, Start",
{{10, 20}, {30, 40}, {50, 60}},
10,
{10,20}
},
{
"start, End",
{{10, 20}, {30, 40}, {50, 60}},
20,
{-1,-1}
},
// MIDDLE
{
"middle, After",
{{10, 20}, {30, 40}, {50, 60}},
45,
{-1,-1}
},
{
"middle, Inside",
{{10, 20}, {30, 40}, {50, 60}},
35,
{30,40}
},
{
"middle, Start",
{{10, 20}, {30, 40}, {50, 60}},
30,
{30,40}
},
{
"middle, End",
{{10, 20}, {30, 40}, {50, 60}},
40,
{-1,-1}
},
// END
{
"end, After",
{{10, 20}, {30, 40}, {50, 60}},
65,
{-1,-1}
},
{
"end, Inside",
{{10, 20}, {30, 40}, {50, 60}},
55,
{50,60}
},
{
"end, Start",
{{10, 20}, {30, 40}, {50, 60}},
50,
{50,60}
},
{
"end, End",
{{10, 20}, {30, 40}, {50, 60}},
60,
{-1,-1}
},
};
template<typename T, bool B>
DATA_CASE_TEST(PARAM_TYPE param, RangeSet<T, B> & set){
for(auto && p:param.inserted){
set.insert(p);
}
if(param.expected.first == -1){
REQUIRE(set.find(param.searched) == set.cend());