chapter-organizer/Tests/Parsers/EventOccurrence/TimeParser_Tests.cs

using Core.Parsers.EventOccurrence;
using NUnit.Framework;

namespace Tests.Parsers.EventOccurrence;

[TestFixture]
public class TimeParser_Tests
{
    [Test]
    public void Parse_NOON_Returns12PM()
    {
        // Act
        var result = TimeParser.Parse("NOON");

        // Assert
        Assert.That(result, Is.EqualTo(new TimeOnly(12, 0, 0)));
    }

    [Test]
    public void Parse_TBD_ReturnsMidnight()
    {
        // Act
        var result = TimeParser.Parse("TBD");

        // Assert
        Assert.That(result, Is.EqualTo(new TimeOnly(0, 0, 0)));
    }

    [Test]
    public void Parse_TBD_CaseInsensitive_ReturnsMidnight()
    {
        // Act
        var result = TimeParser.Parse("tbd");

        // Assert
        Assert.That(result, Is.EqualTo(new TimeOnly(0, 0, 0)));
    }

    [Test]
    public void Parse_AMTime_ReturnsCorrectTime()
    {
        // Act
        var result = TimeParser.Parse("10:30 a.m.");

        // Assert
        Assert.That(result, Is.EqualTo(new TimeOnly(10, 30, 0)));
    }

    [Test]
    public void Parse_PMTime_ReturnsCorrectTime()
    {
        // Act
        var result = TimeParser.Parse("3:45 p.m.");

        // Assert
        Assert.That(result, Is.EqualTo(new TimeOnly(15, 45, 0)));
    }

    [Test]
    public void Parse_TimeRange_ExtractsStartTime()
    {
        // Act
        var result = TimeParser.Parse("10:00 a.m. - 12:00 p.m.");

        // Assert
        Assert.That(result, Is.EqualTo(new TimeOnly(10, 0, 0)));
    }

    [Test]
    public void Parse_TimeRangeWithNOON_ExtractsStartTime()
    {
        // Act
        var result = TimeParser.Parse("10:30 a.m. - NOON");

        // Assert
        Assert.That(result, Is.EqualTo(new TimeOnly(10, 30, 0)));
    }

    [Test]
    public void Parse_TimeWithoutMinutes_ReturnsCorrectTime()
    {
        // Act
        var result = TimeParser.Parse("3 p.m.");

        // Assert
        Assert.That(result, Is.EqualTo(new TimeOnly(15, 0, 0)));
    }

    [Test]
    public void Parse_TimeWithoutColon_ReturnsCorrectTime()
    {
        // Act
        var result = TimeParser.Parse("1030 a.m.");

        // Assert
        Assert.That(result, Is.EqualTo(new TimeOnly(10, 30, 0)));
    }

    [Test]
    public void Parse_12PM_Returns12PM_NotMidnight()
    {
        // Act
        var result = TimeParser.Parse("12:00 p.m.");

        // Assert
        Assert.That(result, Is.EqualTo(new TimeOnly(12, 0, 0)));
    }

    [Test]
    public void Parse_12AM_ReturnsMidnight()
    {
        // Act
        var result = TimeParser.Parse("12:00 a.m.");

        // Assert
        Assert.That(result, Is.EqualTo(new TimeOnly(0, 0, 0)));
    }

    [Test]
    public void Parse_InvalidFormat_ThrowsFormatException()
    {
        // Act & Assert
        Assert.Throws<FormatException>(() => TimeParser.Parse("invalid time format"));
    }

    [Test]
    public void ExtractStartTime_Range_ReturnsStartTime()
    {
        // Act
        var result = TimeParser.ExtractStartTime("10:00 a.m. - 12:00 p.m.");

        // Assert
        Assert.That(result, Is.EqualTo("10:00 a.m."));
    }

    [Test]
    public void ExtractStartTime_NoRange_ReturnsOriginal()
    {
        // Act
        var result = TimeParser.ExtractStartTime("3:00 p.m.");

        // Assert
        Assert.That(result, Is.EqualTo("3:00 p.m."));
    }

    [Test]
    public void ExtractStartTime_RangeWithNOON_ReturnsStartTime()
    {
        // Act
        var result = TimeParser.ExtractStartTime("10:30 a.m. - NOON");

        // Assert
        Assert.That(result, Is.EqualTo("10:30 a.m."));
    }
}