using Xunit;
using System;
using System.IO;
namespace ConsoleApp {
    public class ProgramTests {
        [Fact(DisplayName = "CelsiusToFahrenheit returns correct value for 25")] 
        public void CelsiusToFahrenheit_ReturnsCorrectValue() 
        {
            double result = TemperatureConverter.CelsiusToFahrenheit(25);
            Assert.Equal(77, result, 4);
        }

        [Fact(DisplayName = "FahrenheitToCelsius returns correct value for 77")] 
        public void FahrenheitToCelsius_ReturnsCorrectValue() 
        {
            double result = TemperatureConverter.FahrenheitToCelsius(77);
            Assert.Equal(25, result, 4);
        }

        [Fact(DisplayName = "Methods are accessible without instantiation")] 
        public void Methods_AccessibleWithoutInstantiation() 
        {
            // Should not require instantiation
            double c = TemperatureConverter.CelsiusToFahrenheit(0);
            double f = TemperatureConverter.FahrenheitToCelsius(32);
            Assert.Equal(32, c, 4);
            Assert.Equal(0, f, 4);
        }

        [Fact(DisplayName = "TemperatureConverter cannot be instantiated")] 
        public void TemperatureConverter_CannotBeInstantiated() 
        {
            var type = typeof(TemperatureConverter);
            Assert.True(type.IsAbstract && type.IsSealed, "TemperatureConverter should be static and cannot be instantiated.");
        }
    }
}

ProgramTests.cs

Master the art of building robust C# classes through hands-on drills and engaging theory. Explore constructors, encapsulation, access modifiers, static classes, and more, with real-world inspired challenges.

Dive into the world of constructors in C#. Learn how to initialize objects, use constructor overloading, and apply best practices for flexible class instantiation.

Explore the principles of class design, encapsulation, and how to protect and organize data using access modifiers.

Learn how to use static classes and members for shared data and utility functionality in C#.

Delve into advanced class construction topics: composition vs inheritance, and refactoring structs into classes for more complex scenarios.

Challenge: Utility Class for Temperature Conversion

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Challenge: Utility Class for Temperature Conversion

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