
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.

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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

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Challenge: Input Validation for Registration

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