#include "d_range.h"
#include <vector>

#define BOOST_TEST_DYN_LINK
#define BOOST_TEST_MODULE Rebirth xrange
#include <boost/test/unit_test.hpp>

/* Test that an xrange is empty when the ending bound is 0.
 */
BOOST_AUTO_TEST_CASE(xrange_empty_0)
{
	bool empty = true;
	for (auto &&v : xrange(0u))
	{
		(void)v;
		empty = false;
	}
	BOOST_TEST(empty);
}

/* Test that an xrange is empty when the start is higher than the end.
 */
BOOST_AUTO_TEST_CASE(xrange_empty_transposed)
{
	bool empty = true;
	for (auto &&v : xrange(2u, 1u))
	{
		(void)v;
		empty = false;
	}
	BOOST_TEST(empty);
}

/* Test that an xrange produces the correct number of entries.
 */
BOOST_AUTO_TEST_CASE(xrange_length)
{
	unsigned count = 0;
	constexpr unsigned length = 4u;
	for (auto &&v : xrange(length))
	{
		(void)v;
		++ count;
	}
	BOOST_TEST(count == length);
}

/* Test that an xrange produces the correct values when using an implied
 * start of 0.
 */
BOOST_AUTO_TEST_CASE(xrange_contents)
{
	std::vector<unsigned> out;
	for (auto &&v : xrange(4u))
		out.emplace_back(v);
	std::vector<unsigned> expected{0, 1, 2, 3};
	BOOST_TEST(out == expected);
}

/* Test that an xrange produces the correct values when using an
 * explicit start.
 */
BOOST_AUTO_TEST_CASE(xrange_contents_start)
{
	std::vector<unsigned> out;
	for (auto &&v : xrange(2u, 4u))
		out.emplace_back(v);
	std::vector<unsigned> expected{2, 3};
	BOOST_TEST(out == expected);
}