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("area(int, int) returns correct area for rectangle")
    void testRectangleArea() {
        assertEquals(50, com.example.Main.area(5, 10), "Rectangle area should be width * height");
        assertEquals(0, com.example.Main.area(0, 10), "Area should be zero if width is zero");
        assertEquals(0, com.example.Main.area(10, 0), "Area should be zero if height is zero");
        assertEquals(6, com.example.Main.area(2, 3), "Area should be width * height");
    }

    @Test
    @DisplayName("area(double) returns correct area for circle")
    void testCircleArea() {
        assertEquals(Math.PI * 3.0 * 3.0, com.example.Main.area(3.0), 0.0001, "Circle area should be PI * r^2");
        assertEquals(0.0, com.example.Main.area(0.0), 0.0001, "Area should be zero if radius is zero");
    }

    @Test
    @DisplayName("area(double, double, double) returns correct area for triangle using Heron's formula")
    void testTriangleArea() {
        assertEquals(6.0, com.example.Main.area(3.0, 4.0, 5.0), 0.0001, "Triangle area should match Heron's formula for 3-4-5 triangle");
        assertEquals(0.0, com.example.Main.area(1.0, 2.0, 3.0), 0.0001, "Area should be zero when triangle is degenerate");
    }
}

MainTest.java

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Explore the basics of methods in Java, including their structure, purpose, and how they enable code reuse and modularity.

Delve into parameter passing, argument types, and how methods interact with data.

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Challenge: Method Overloading

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Challenge: Method Overloading

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