DesktopClock/DesktopClock.Tests/DateTimeTests.cs

using System;

namespace DesktopClock.Tests;

public class DateTimeTests
{
    [Theory]
    [InlineData("2024-07-15T00:00:00Z", "00:00:00")]
    [InlineData("2024-07-15T00:00:00Z", "01:00:00")]
    [InlineData("0001-01-01T00:00:00Z", "00:00:00")]
    public void ToDateTimeOffset_ShouldConvertDateTimeToExpectedOffset(string dateTimeString, string offsetString)
    {
        // Arrange
        var dateTime = DateTime.Parse(dateTimeString);
        var offset = TimeSpan.Parse(offsetString);

        // Act
        var dateTimeOffset = dateTime.ToDateTimeOffset(offset);

        // Assert
        Assert.Equal(new DateTimeOffset(dateTime.Ticks, offset), dateTimeOffset);
    }

    [Theory]
    [InlineData("dddd, MMMM dd", "Monday, January 01")]
    [InlineData("yyyy-MM-dd", "2024-01-01")]
    [InlineData("HH:mm:ss", "00:00:00")]
    [InlineData("MMMM dd, yyyy", "January 01, 2024")]
    public void FromFormat_CreatesCorrectExample(string format, string expected)
    {
        // Arrange
        var dateTimeOffset = new DateTime(2024, 01, 01);

        // Act
        var dateFormatExample = DateFormatExample.FromFormat(format, dateTimeOffset);

        // Assert
        Assert.Equal(format, dateFormatExample.Format);
        Assert.Equal(expected, dateFormatExample.Example);
    }
}