PKHeX/Tests/PKHeX.Core.Tests/Util/DateUtilTests.cs

using System;
using FluentAssertions;
using PKHeX.Core;
using Xunit;

namespace PKHeX.Tests.Util;

public class DateUtilTests
{
    [Theory]
    [InlineData(2000, 1, 1)]
    [InlineData(2001, 1, 31)]
    public void RecognizesCorrectDates(int year, int month, int day)
    {
        Assert.True(DateUtil.IsDateValid(year, month, day), $"Failed to recognize {year}/{month}/{day}");
    }

    [Theory]
    [InlineData(2016, 1, 31)]
    [InlineData(2016, 2, 28)]
    [InlineData(2016, 3, 31)]
    [InlineData(2016, 4, 30)]
    [InlineData(2016, 5, 31)]
    [InlineData(2016, 6, 30)]
    [InlineData(2016, 7, 31)]
    [InlineData(2016, 8, 31)]
    [InlineData(2016, 9, 30)]
    [InlineData(2016, 10, 31)]
    [InlineData(2016, 11, 30)]
    [InlineData(2016, 12, 31)]
    public void RecognizesValidMonthBoundaries(int year, int month, int day)
    {
        Assert.True(DateUtil.IsDateValid(year, month, day), $"Incorrect month boundary for {year}/{month}/{day}");
    }

    [Fact]
    public void RecognizeCorrectLeapYear()
    {
        Assert.True(DateUtil.IsDateValid(2004, 2, 29));
    }

    [Theory]
    [InlineData(0, 0, 0, false, "Zero date")]
    [InlineData(2005, 2, 29, false, "Bad leap year")]
    [InlineData(0, 1, 1, false, "Zero year")]
    [InlineData(2000, 0, 1, false, "Zero month")]
    [InlineData(2000, 1, 0, false, "Zero day")]
    [InlineData(10000, 1, 0, false, "Big year")]
    [InlineData(2000, 13, 0, false, "Big month")]
    [InlineData(2000, 1, 32, false, "Big day")]
    [InlineData(2019, 11, 31, false, "Bad date, November doesn't have a 31st")]
    [InlineData(uint.MaxValue, uint.MaxValue, uint.MaxValue, false, "Failed with uint.MaxValue, negative")]
    public void CheckDate(uint year, uint month, uint day, bool cmp, string because)
    {
        var result = DateUtil.IsDateValid(year, month, day);
        result.Should().Be(cmp, because);
    }

    [Theory]
    [InlineData(2000, 12, 1, 2000, 12, 31, 1337)] // +6
    [InlineData(2000, 12, 1, 2000, 12, 31, 35)] // rand->+0
    [InlineData(2000, 12, 1, 2000, 12, 31, 12)] // rand->+30
    public void CheckRandomDate(int y1, int m1, int d1, int y2, int m2, int d2, int seed)
    {
        var start = new DateTime(y1, m1, d1);
        var end = new DateTime(y2, m2, d2);
        (start <= end).Should().BeTrue();

        var r = new Random(seed);
        var rand = DateUtil.GetRandomDateWithin(start, end, r);
        (start <= rand).Should().BeTrue();
        (rand <= end).Should().BeTrue();
    }
}