using Xunit;

namespace ConsoleApp.Tests
{
    public class ProgramTests
    {
        [Fact(DisplayName = "ConvertToFahrenheit converts correctly for positive Celsius values")]
        public void ConvertToFahrenheit_PositiveValues()
        {
            double result = Program.ConvertToFahrenheit(25); // 25°C => 77°F
            Assert.Equal(77.0, result, 1);

            result = Program.ConvertToFahrenheit(0); // 0°C => 32°F
            Assert.Equal(32.0, result, 1);

            result = Program.ConvertToFahrenheit(100); // 100°C => 212°F
            Assert.Equal(212.0, result, 1);
        }

        [Fact(DisplayName = "ConvertToFahrenheit converts correctly for negative Celsius values")]
        public void ConvertToFahrenheit_NegativeValues()
        {
            double result = Program.ConvertToFahrenheit(-10); // -10°C => 14°F
            Assert.Equal(14.0, result, 1);

            result = Program.ConvertToFahrenheit(-40); // -40°C => -40°F
            Assert.Equal(-40.0, result, 1);
        }

        [Fact(DisplayName = "ConvertToFahrenheit works for fractional Celsius values")]
        public void ConvertToFahrenheit_FractionalValues()
        {
            double result = Program.ConvertToFahrenheit(36.6); // 36.6°C => 97.88°F
            Assert.Equal(97.88, result, 2);

            result = Program.ConvertToFahrenheit(0.5); // 0.5°C => 32.9°F
            Assert.Equal(32.9, result, 1);
        }
    }
}

ProgramTests.cs

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Challenge: Return Values

Solution