package com.example;

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

import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;

public class MainTest {
    @Test
    @DisplayName("calculateTotalExpenses sums all values in the array")
    void testCalculateTotalExpensesSum() {
        double[] expenses = {10.0, 20.5, 5.25, 4.25};
        double expected = 40.0;
        double actual = Main.calculateTotalExpenses(expenses);
        assertEquals(expected, actual, 0.0001, "Should sum all values in the array");
    }

    @Test
    @DisplayName("calculateTotalExpenses returns 0 for empty array")
    void testCalculateTotalExpensesEmpty() {
        double[] expenses = {};
        double expected = 0.0;
        double actual = Main.calculateTotalExpenses(expenses);
        assertEquals(expected, actual, 0.0001, "Should return 0 for empty array");
    }

    @Test
    @DisplayName("calculateTotalExpenses handles single value array")
    void testCalculateTotalExpensesSingle() {
        double[] expenses = {99.99};
        double expected = 99.99;
        double actual = Main.calculateTotalExpenses(expenses);
        assertEquals(expected, actual, 0.0001, "Should return the single value");
    }
}

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: Even Number Collector

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