
using Xunit;
namespace ConsoleApp {
    public class ProgramTests {
        [Fact(DisplayName = "Returns true for valid email and password")] 
        public void ValidateRegistration_ValidInput_ReturnsTrue() {
            Assert.True(Program.ValidateRegistration("user@example.com", "Pa$$word1"), "Should return true for valid email and password");
            Assert.True(Program.ValidateRegistration("a@b.cd", "abcdefgh"), "Should return true for valid minimal email and password");
        }

        [Fact(DisplayName = "Returns false if email does not contain exactly one @")] 
        public void ValidateRegistration_InvalidEmailAt_ReturnsFalse() {
            Assert.False(Program.ValidateRegistration("userexample.com", "Pa$$word1"), "Should return false if email missing @");
            Assert.False(Program.ValidateRegistration("user@@example.com", "Pa$$word1"), "Should return false if email has multiple @");
            Assert.False(Program.ValidateRegistration("@example.com", "Pa$$word1"), "Should return false if @ is at start");
        }

        [Fact(DisplayName = "Returns false if email does not contain '.' after '@'")] 
        public void ValidateRegistration_InvalidEmailDot_ReturnsFalse() {
            Assert.False(Program.ValidateRegistration("user@examplecom", "Pa$$word1"), "Should return false if no dot after @");
            Assert.False(Program.ValidateRegistration("user@.com", "Pa$$word1"), "Should return false if dot is immediately after @");
            Assert.False(Program.ValidateRegistration("user@domain", "Pa$$word1"), "Should return false if no dot after @");
        }

        [Fact(DisplayName = "Returns false if password is fewer than 8 characters")] 
        public void ValidateRegistration_ShortPassword_ReturnsFalse() {
            Assert.False(Program.ValidateRegistration("user@example.com", "short"), "Should return false if password is too short");
            Assert.False(Program.ValidateRegistration("user@example.com", "1234567"), "Should return false if password is 7 chars");
            Assert.False(Program.ValidateRegistration("user@example.com", ""), "Should return false if password is empty");
        }
    }
}

ProgramTests.cs

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Learn the basics of exceptions in C#, how to use try-catch blocks, and why error handling is crucial for robust applications.

Learn to create your own exception types and use guard clauses to prevent invalid states in your code.

Master techniques for validating user input and safely parsing data to prevent runtime errors.

Handle file operations safely and learn to debug exceptions using stack traces and refactoring techniques.

Challenge: Input Validation for Registration

Lösning

Challenge: Input Validation for Registration

Lösning