ConsoleGameHub/WordGuessGameTest.java at main · On-Time-Software-Developers/ConsoleGameHub · GitHub

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import org.junit.jupiter.api.Test;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.util.Optional;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;

/**
 * Tests for WordGuessGame.
 * @version 1
 */
public class WordGuessGameTest {

    @Test
    public void testCorrectGuessOnFirstTry() {
        String simulatedInput = "APPLE\n";
        InputStream originalIn = System.in;
        System.setIn(new ByteArrayInputStream(simulatedInput.getBytes()));

        WordGuessGame game = new WordGuessGame();
        Optional<Integer> result = game.play();

        assertTrue(result.isPresent());
        assertEquals(6, result.get());

        System.setIn(originalIn);
    }

    @Test
    public void testIncorrectThenCorrectGuess() {
        String simulatedInput = "MANGO\nAPPLE\n";
        InputStream originalIn = System.in;
        System.setIn(new ByteArrayInputStream(simulatedInput.getBytes()));

        WordGuessGame game = new WordGuessGame();
        Optional<Integer> result = game.play();

        assertTrue(result.isPresent());
        assertEquals(5, result.get());

        System.setIn(originalIn);
    }

    @Test
    public void testAllIncorrectGuesses() {
        String simulatedInput = "MANGO\nGRAPE\nPLUMB\nBERRY\nPEACH\nLEMON\n";
        InputStream originalIn = System.in;
        System.setIn(new ByteArrayInputStream(simulatedInput.getBytes()));

        WordGuessGame game = new WordGuessGame();
        Optional<Integer> result = game.play();

        assertTrue(result.isPresent());
        assertEquals(0, result.get());

        System.setIn(originalIn);
    }
}