package com.example;

import org.junit.jupiter.api.*;
import java.io.ByteArrayOutputStream;
import java.io.PrintStream;

import static org.junit.jupiter.api.Assertions.*;

public class MainTest {

    private UserScores scores;

    @BeforeEach
    void setUp() {
        scores = new UserScores();
        scores.addUser("Alice", 90);
        scores.addUser("Bob", 75);
        scores.addUser("Charlie", 88);
    }

    @Test
    @DisplayName("addUser adds and getUserScore retrieves correct score")
    void testAddAndGetUserScore() {
        assertEquals(90, scores.getUserScore("Alice"), "Alice's score should be 90");
        assertEquals(75, scores.getUserScore("Bob"), "Bob's score should be 75");
        assertEquals(88, scores.getUserScore("Charlie"), "Charlie's score should be 88");
    }

    @Test
    @DisplayName("getUserScore returns null for missing user")
    void testGetUserScoreMissing() {
        assertNull(scores.getUserScore("David"), "Should return null for non-existent user");
    }

    @Test
    @DisplayName("removeUser removes user and getUserScore returns null")
    void testRemoveUser() {
        scores.removeUser("Bob");
        assertNull(scores.getUserScore("Bob"), "After removal, Bob should not be found");
        assertEquals(90, scores.getUserScore("Alice"), "Alice should still be present");
    }

    @Test
    @DisplayName("printAllUsers prints all users and scores, one per line")
    void testPrintAllUsers() {
        ByteArrayOutputStream outContent = new ByteArrayOutputStream();
        PrintStream originalOut = System.out;
        System.setOut(new PrintStream(outContent));

        scores.printAllUsers();

        System.setOut(originalOut);
        String output = outContent.toString().trim();
        int count = 0;
        if (output.contains("User: Alice, Score: 90")) count++;
        if (output.contains("User: Bob, Score: 75")) count++;
        if (output.contains("User: Charlie, Score: 88")) count++;
        assertEquals(3, count, "Should print all three users");
    }

    @Test
    @DisplayName("printAllUsers prints after removal")
    void testPrintAllUsersAfterRemoval() {
        scores.removeUser("Bob");
        ByteArrayOutputStream outContent = new ByteArrayOutputStream();
        PrintStream originalOut = System.out;
        System.setOut(new PrintStream(outContent));

        scores.printAllUsers();

        System.setOut(originalOut);
        String output = outContent.toString().trim();
        assertTrue(output.contains("User: Alice, Score: 90"), "Should contain Alice");
        assertFalse(output.contains("User: Bob, Score: 75"), "Should not contain Bob");
        assertTrue(output.contains("User: Charlie, Score: 88"), "Should contain Charlie");
    }
}


MainTest.java

Een praktische gids voor Java-gegevensstructuren en collecties. Verken lijsten, gekoppelde lijsten, wachtrijen, deques, stacks en maps, terwijl u oefent met CRUD-bewerkingen, algoritmische complexiteit en praktijkgerichte uitdagingen zoals bibliotheekbeheer en browsergeschiedenis.

Een praktische gids voor datastructuren en collecties in Java. Verken lijsten, gekoppelde lijsten, wachtrijen, deques, stacks en maps, met oefening in CRUD-bewerkingen, algoritmische complexiteit en praktijkgerichte uitdagingen zoals bibliotheekbeheer en browsergeschiedenis.

Uitdaging: Gebruikersscores Opslaan en Ophalen

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