//Deepdive-V3-377318-Step 1-UnitTest

using System;

using NUnit.Framework;

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[TestFixture]

public class BabylonianSqrtTests

{

    [Test]

    public void TestPositiveNumber()

    {

        Assert.That(BabylonianSqrt.Sqrt(9), Is.EqualTo(3).Within(0.0001));

        Assert.That(BabylonianSqrt.Sqrt(25), Is.EqualTo(5).Within(0.0001));

        Assert.That(BabylonianSqrt.Sqrt(2), Is.EqualTo(1.4142).Within(0.0001));

        Assert.That(BabylonianSqrt.Sqrt(10), Is.EqualTo(3.1622).Within(0.0001));

    }

​

    [Test]

    public void TestZero()

    {

         Assert.That(BabylonianSqrt.Sqrt(0), Is.EqualTo(0).Within(0.0001));

    }

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     [Test]

     public void TestSmallNumber()

    {

        Assert.That(BabylonianSqrt.Sqrt(0.01), Is.EqualTo(0.1).Within(0.0001));

        Assert.That(BabylonianSqrt.Sqrt(0.04), Is.EqualTo(0.2).Within(0.0001));

    }

​

    [Test]

    public void TestLargeNumber()

    {

         Assert.That(BabylonianSqrt.Sqrt(10000), Is.EqualTo(100).Within(0.0001));

         Assert.That(BabylonianSqrt.Sqrt(1000000), Is.EqualTo(1000).Within(0.0001));

    }

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    [Test]

    public void TestNegativeNumberThrowsException()

    {

        Assert.Throws<ArgumentException>(() => BabylonianSqrt.Sqrt(-1));

    }

}

public class BabylonianSqrt

{

    public static double Sqrt(double number, double tolerance = 0.0001)

    {

        if (number < 0)

        {

            throw new ArgumentException("Cannot calculate square root of a negative number.");

        }

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        if (number == 0)

        {

            return 0;

        }

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        double guess = number / 2;

        double nextGuess;

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        do

        {

            nextGuess = (guess + number / guess) / 2;

            if(Math.Abs(guess - nextGuess) < tolerance)

                break;

            guess = nextGuess;

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        } while (true);

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        return nextGuess;

    }

    public static void Main(string[] args)

    {

        Console.WriteLine(" ");

        Console.WriteLine("-------------- STARTING UNIT TESTING ---------------");

        new NUnitLite.AutoRun().Execute(["--noc" ]);    

    }

}

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