#include "span.hpp"
#include <gtest/gtest.h>

TEST(Span, SpanSum) {
    const int data[] = {1, 2, 3, 4};
    EXPECT_EQ(cpp20::span_sum(data), 10);
}

TEST(Span, FirstAndLast) {
    const std::vector<int> data = {10, 20, 30};
    const auto [first, last] = cpp20::first_and_last(std::span<const int>{data});
    EXPECT_EQ(first, 10);
    EXPECT_EQ(last, 30);
}

TEST(Span, MakeSubspan) {
    const std::vector<int> data = {1, 2, 3, 4, 5};
    EXPECT_EQ(cpp20::make_subspan(data, 1, 3), (std::vector<int>{2, 3, 4}));
}