
using Xunit;
using Xunit;
using System;
using System.IO;

namespace ConsoleApp {
    public class ProgramTests {
        [Fact(DisplayName = "Stops checking after correct password is entered (no if or break)")]
        public void StopsCheckingAfterCorrectPassword_NoIfOrBreak()
        {
            var sw = new StringWriter();
            Console.SetOut(sw);
            string[] attempts = {"wrong1", "letmein", "wrong2"};
            Program.SimulatePasswordAttempts("letmein", attempts, 3);
            string output = sw.ToString();
            Assert.Contains("Password entered: wrong1", output);
            Assert.Contains("Password entered: letmein", output);
            Assert.DoesNotContain("Password entered: wrong2", output);
            Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = true });
        }
        
        [Fact(DisplayName = "Prints success message when correct password is found (no if)")]
        public void PrintsSuccessMessage_NoIf()
        {
            var sw = new StringWriter();
            Console.SetOut(sw);
            string[] attempts = {"letmein"};
            Program.SimulatePasswordAttempts("letmein", attempts, 3);
            string output = sw.ToString();
            Assert.Contains("Access granted!", output);
            Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = true });
        }
        
        [Fact(DisplayName = "Prints account locked message if all attempts used (no if)")]
        public void PrintsAccountLockedMessage_NoIf()
        {
            var sw = new StringWriter();
            Console.SetOut(sw);
            string[] attempts = {"wrong1", "wrong2", "wrong3"};
            Program.SimulatePasswordAttempts("letmein", attempts, 3);
            string output = sw.ToString();
            Assert.Contains("Account locked. Too many failed attempts.", output);
            Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = true });
        }
        
        [Fact(DisplayName = "Decreases attempts after each wrong password (no if)")]
        public void DecreasesAttemptsAfterEachWrongPassword_NoIf()
        {
            var sw = new StringWriter();
            Console.SetOut(sw);
            string[] attempts = {"bad", "nope", "letmein"};
            Program.SimulatePasswordAttempts("letmein", attempts, 3);
            string output = sw.ToString();
            Assert.Contains("Incorrect password. Attempts left: 2", output);
            Assert.Contains("Incorrect password. Attempts left: 1", output);
            Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = true });
        }
        
        [Fact(DisplayName = "Prints attempts left after each incorrect try (no if)")]
        public void PrintsAttemptsLeftAfterEachIncorrectTry_NoIf()
        {
            var sw = new StringWriter();
            Console.SetOut(sw);
            string[] attempts = {"bad", "nope", "wrong"};
            Program.SimulatePasswordAttempts("letmein", attempts, 3);
            string output = sw.ToString();
            Assert.Contains("Incorrect password. Attempts left: 2", output);
            Assert.Contains("Incorrect password. Attempts left: 1", output);
            Assert.Contains("Incorrect password. Attempts left: 0", output);
            Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = true });
        }
    }
}

ProgramTests.cs

In this task:

- **`attempt`** is the current password guess from the `attempts` array, used for printing and comparison;
- **`remaining`** counts how many tries are left, decreasing after each wrong password;
- **`found`** is `true` when the correct password is entered, stopping the loop.

These variables let you manage attempts and stop the loop without using `if`, `else`, or `break`.

Note

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Master while and do-while loops for scenarios where the number of iterations isn't known in advance, and learn to control loop execution with conditions.

Delve into advanced looping techniques, including nested loops for pattern generation, loop transformations, efficiency, and avoiding common mistakes.

Challenge: Password Attempts

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Challenge: Password Attempts

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