package com.example;

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

public class MainTest {
    @Test
    @DisplayName("sumHighValueItems sums only items > 10 (mixed values)")
    void testMixedValues() {
        int[] prices = {5, 12, 8, 20, 3, 15};
        int expected = 47;
        int actual = com.example.Main.sumHighValueItems(prices);
        assertEquals(expected, actual, "Should sum only 12, 20, and 15 (total 47)");
    }

    @Test
    @DisplayName("sumHighValueItems returns 0 when all items are 10 or less")
    void testAllBelowOrEqualTen() {
        int[] prices = {10, 5, 8, 3, 7};
        int expected = 0;
        int actual = com.example.Main.sumHighValueItems(prices);
        assertEquals(expected, actual, "Should return 0 when no items are above 10");
    }

    @Test
    @DisplayName("sumHighValueItems sums all when all items are above 10")
    void testAllAboveTen() {
        int[] prices = {11, 20, 30};
        int expected = 61;
        int actual = com.example.Main.sumHighValueItems(prices);
        assertEquals(expected, actual, "Should sum all prices (61)");
    }

    @Test
    @DisplayName("sumHighValueItems returns 0 for empty array")
    void testEmptyArray() {
        int[] prices = {};
        int expected = 0;
        int actual = com.example.Main.sumHighValueItems(prices);
        assertEquals(expected, actual, "Should return 0 for empty input");
    }

    @Test
    @DisplayName("sumHighValueItems handles single element array above 10")
    void testSingleAboveTen() {
        int[] prices = {25};
        int expected = 25;
        int actual = com.example.Main.sumHighValueItems(prices);
        assertEquals(expected, actual, "Should return the single element if above 10");
    }

    @Test
    @DisplayName("sumHighValueItems handles single element array at or below 10")
    void testSingleAtOrBelowTen() {
        int[] prices = {10};
        int expected = 0;
        int actual = com.example.Main.sumHighValueItems(prices);
        assertEquals(expected, actual, "Should return 0 if single element is not above 10");
    }
}

MainTest.java

A beginner-friendly course designed to introduce learners to the fundamentals of loops in Java. Through a blend of clear explanations, practical examples, and hands-on tasks, students will gain confidence in using for, while, and do-while loops, as well as applying them to solve real-world problems.

Introduce the concept of loops, their necessity, and the basic structure of for, while, and do-while loops in Java. This section lays the foundation for understanding how repetition works in programming.

Dive deeper into different loop types, including do-while loops and nested loops, and learn how to control loop execution with break and continue.

Apply loop concepts to solve practical problems, including working with arrays and combining loops with conditionals.

Challenge: Array Sum Calculator

解答