date_time_tests.cpp

#include <stdexcept>
#include "catch.hpp"
#include "date_time.h"

using namespace geheb;
using namespace std;
using namespace std::chrono;

TEST_CASE("date_time now has time since epoch", "[date_time]") {
    const auto now = date_time::now();
    const auto tp = (system_clock::time_point)now;
    REQUIRE(tp.time_since_epoch().count() > 0);
}

TEST_CASE("date_time with 1970-1-1 has 0 seconds since epoch", "[date_time]") {
    const date_time other(1970, 1, 1);
    const auto tp = (system_clock::time_point)other;
    REQUIRE(tp.time_since_epoch().count() == 0);
}

TEST_CASE("date_time ctor eqals with properties", "[date_time]") {
    const date_time other(1970, 1, 2, 3, 4, 5);
    REQUIRE(other.year() == 1970);
    REQUIRE(other.month() == 1);
    REQUIRE(other.day() == 2);
    REQUIRE(other.day_of_week() == 5);
    REQUIRE(other.hour() == 3);
    REQUIRE(other.minute() == 4);
    REQUIRE(other.second() == 5);
}

TEST_CASE("date_time with 1970-1-1 at 1 o'clock has 3600 seconds since epoch", "[date_time]") {
    const date_time other(1970, 1, 1, 1);
    auto secondsSinceEpoch = duration_cast<seconds>(((system_clock::time_point)other).time_since_epoch()).count();
    REQUIRE(secondsSinceEpoch == 3600);
}

TEST_CASE("date_time with 1970-1-3 is weekend", "[date_time]") {
    const date_time other(1970, 1, 3);
    REQUIRE(other.is_weekend());
}

TEST_CASE("date_time with 1970-1-4 is weekend", "[date_time]") {
    const date_time other(1970, 1, 4);
    REQUIRE(other.is_weekend());
}

TEST_CASE("date_time with 1970-1-5 is not weekend", "[date_time]") {
    const date_time other(1970, 1, 5);
    REQUIRE(!other.is_weekend());
}

TEST_CASE("date_time with 1970-1-5 is monday", "[date_time]") {
    const date_time other(1970, 1, 5);
    REQUIRE(other.day_of_week() == 1);
}

TEST_CASE("date_time with 1970-1-6 is tuesday", "[date_time]") {
    const date_time other(1970, 1, 6);
    REQUIRE(other.day_of_week() == 2);
}

TEST_CASE("date_time with 1970-1-7 is wednesday", "[date_time]") {
    const date_time other(1970, 1, 7);
    REQUIRE(other.day_of_week() == 3);
}

TEST_CASE("date_time with 1970-1-8 is thursday", "[date_time]") {
    const date_time other(1970, 1, 8);
    REQUIRE(other.day_of_week() == 4);
}

TEST_CASE("date_time with 1970-1-9 is friday", "[date_time]") {
    const date_time other(1970, 1, 9);
    REQUIRE(other.day_of_week() == 5);
}

TEST_CASE("date_time with 1970-1-10 is saturday", "[date_time]") {
    const date_time other(1970, 1, 10);
    REQUIRE(other.day_of_week() == 6);
}

TEST_CASE("date_time with 1970-1-11 is sunday", "[date_time]") {
    const date_time other(1970, 1, 11);
    REQUIRE(other.day_of_week() == 0);
}

TEST_CASE("date_time copy has same values", "[date_time]") {
    const auto now = date_time::now();
    const auto other = now;
    REQUIRE(now == other);
}

TEST_CASE("date_time with now is greater then 2000-1-1", "[date_time]") {
    const auto other = date_time(2000,1,1);
    const auto now = date_time::now();
    REQUIRE(now > other);
}

TEST_CASE("date_time with 2000-1-1 is less then now", "[date_time]") {
    const auto other = date_time(2000, 1, 1);
    const auto now = date_time::now();
    REQUIRE(other < now);
}

TEST_CASE("date_time with now+1s is greater then or equal to now", "[date_time]") {
    const auto other = date_time(date_time::now() - seconds(1));
    const auto now = date_time::now();
    REQUIRE(now >= other);
}

TEST_CASE("date_time with now-1s is less then or equal to now", "[date_time]") {
    const auto other = date_time(date_time::now() - seconds(1));
    const auto now = date_time::now();
    REQUIRE(other <= other);
}

TEST_CASE("date_time with 2000-1-1 is leap year", "[date_time]") {
    const auto other = date_time(2000, 1, 1);
    REQUIRE(other.is_leap());
}

TEST_CASE("date_time with 2100-1-1 is not leap year", "[date_time]") {
    const auto other = date_time(2100, 1, 1);
    REQUIRE(!other.is_leap());
}

TEST_CASE("date_time with january has 31 days", "[date_time]") {
    const auto other = date_time(2000, 1, 31);
    REQUIRE(other.last_day_of_month() == 31);
    REQUIRE(other.day() == 31);
}

TEST_CASE("date_time with february and leap year has 29 days", "[date_time]") {
    const auto other = date_time(2000, 2, 29);
    REQUIRE(other.last_day_of_month() == 29);
    REQUIRE(other.day() == 29);
}

TEST_CASE("date_time with february and non leap year has 28 days", "[date_time]") {
    const auto other = date_time(2001, 2, 28);
    REQUIRE(other.last_day_of_month() == 28);
    REQUIRE(other.day() == 28);
}

TEST_CASE("date_time with march has 31 days", "[date_time]") {
    const auto other = date_time(2000, 3, 31);
    REQUIRE(other.last_day_of_month() == 31);
    REQUIRE(other.day() == 31);
}

TEST_CASE("date_time with april has 30 days", "[date_time]") {
    const auto other = date_time(2000, 4, 30);
    REQUIRE(other.last_day_of_month() == 30);
    REQUIRE(other.day() == 30);
}

TEST_CASE("date_time with may has 31 days", "[date_time]") {
    const auto other = date_time(2000, 5, 31);
    REQUIRE(other.last_day_of_month() == 31);
    REQUIRE(other.day() == 31);
}

TEST_CASE("date_time with june has 30 days", "[date_time]") {
    const auto other = date_time(2000, 6, 30);
    REQUIRE(other.last_day_of_month() == 30);
    REQUIRE(other.day() == 30);
}

TEST_CASE("date_time with july has 31 days", "[date_time]") {
    const auto other = date_time(2000, 7, 31);
    REQUIRE(other.last_day_of_month() == 31);
    REQUIRE(other.day() == 31);
}

TEST_CASE("date_time with august has 31 days", "[date_time]") {
    const auto other = date_time(2000, 8, 31);
    REQUIRE(other.last_day_of_month() == 31);
    REQUIRE(other.day() == 31);
}

TEST_CASE("date_time with september has 30 days", "[date_time]") {
    const auto other = date_time(2000, 9, 30);
    REQUIRE(other.last_day_of_month() == 30);
    REQUIRE(other.day() == 30);
}

TEST_CASE("date_time with october has 31 days", "[date_time]") {
    const auto other = date_time(2000, 10, 31);
    REQUIRE(other.last_day_of_month() == 31);
    REQUIRE(other.day() == 31);
}

TEST_CASE("date_time with novmber has 30 days", "[date_time]") {
    const auto other = date_time(2000, 11, 30);
    REQUIRE(other.last_day_of_month() == 30);
    REQUIRE(other.day() == 30);
}

TEST_CASE("date_time with december has 31 days", "[date_time]") {
    const auto other = date_time(2000, 12, 31);
    REQUIRE(other.last_day_of_month() == 31);
    REQUIRE(other.day() == 31);
}

TEST_CASE("date_time with year 1969 or 5183 throws exception", "[date_time]") {
    REQUIRE_THROWS_AS(date_time(1969, 1, 1), invalid_argument);
    REQUIRE_THROWS_AS(date_time(5138, 1, 1), invalid_argument);
}

TEST_CASE("date_time with month 0 or 13 throws exception", "[date_time]") {
    REQUIRE_THROWS_AS(date_time(2000, 0, 1), invalid_argument);
    REQUIRE_THROWS_AS(date_time(2000, 13, 1), invalid_argument);
}

TEST_CASE("date_time with day 0 or 32 throws exception", "[date_time]") {
    REQUIRE_THROWS_AS(date_time(2000, 1, 0), invalid_argument);
    REQUIRE_THROWS_AS(date_time(2000, 1, 32), invalid_argument);
}

TEST_CASE("date_time with hour -1 or 24 throws exception", "[date_time]") {
    REQUIRE_THROWS_AS(date_time(2000, 1, 1, -1), invalid_argument);
    REQUIRE_THROWS_AS(date_time(2000, 1, 1, 24), invalid_argument);
}

TEST_CASE("date_time with minute -1 or 60 throws exception", "[date_time]") {
    REQUIRE_THROWS_AS(date_time(2000, 1, 1, 0, -1), invalid_argument);
    REQUIRE_THROWS_AS(date_time(2000, 1, 1, 0, 60), invalid_argument);
}

TEST_CASE("date_time with second -1 or 60 throws exception", "[date_time]") {
    REQUIRE_THROWS_AS(date_time(2000, 1, 1, 0, 0, -1), invalid_argument);
    REQUIRE_THROWS_AS(date_time(2000, 1, 1, 0, 0, 60), invalid_argument);
}

TEST_CASE("date_time with 31 february is 2 march", "[date_time]") {
    const auto other = date_time(2000, 2, 31);
    REQUIRE(other.month() == 3);
    REQUIRE(other.day() == 2);
}

TEST_CASE("date_time with adding 50 miliseconds is ignored", "[date_time]") {
    const auto now = date_time::now();
    const auto other = now + milliseconds(50);
    REQUIRE(other == now);
}