michaelmoss michael-moss-tdd-lab-design-your-own-object

src/main/java/michaelmoss/Cat.java

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+package michaelmoss;
+
+public class Cat {
+
+    // 5 private field attributes/modifiers
+    private String name;
+    private int age;
+    private String breed;
+    private String color;
+    private double weight;
+
+
+    // constructor; taking all fields as parameters
+    public Cat(String name, int age, String breed, String color, double weight) {
+
+        if (age < 0) {
+            throw new IllegalArgumentException("Age cannot be negative");
+        }
+
+        if (weight <= 0) {
+            throw new IllegalArgumentException("Weight must be positive");
+
+        }
+
+
+        this.name = name;
+        this.age = age;
+        this.breed = breed;
+        this.color = color;
+        this.weight = weight;
+
+
+    }
+    // Getters
+    public String getName() {
+        return name;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public String getBreed () {
+        return breed;
+    }
+
+    public String getColor () {
+        return color;
+    }
+
+    public double getWeight () {
+        return weight;
+    }
+
+    // Setters
+    public void setName (String name){
+        this.name = name;
+    }
+
+    public void setAge ( int age){
+        this.age = age;
+    }
+
+    public void setBreed (String breed){
+        this.breed = breed;
+    }
+
+    public void setColor (String color){
+        this.color = color;
+    }
+
+    public void setWeight ( double weight){
+        this.weight = weight;
+    }
+    // 2 random methods
+    public void meow() {
+        System.out.println(name + " says: Meow!");
+    }
+
+    public void eat2(double foodWeight) {
+        weight += foodWeight;
+    }
+    // IllegalArgumentException; validated weight
+    public void eat(double foodWeight) {
+
+
+        if (foodWeight < 0) {
+            throw new IllegalArgumentException("Food amount cannot be negative");
+        }
+
+        this.weight += foodWeight;
+    }
+
+    }
+
+
+
+
+
+
+
+
+

src/test/java/michaelmoss/CatTest.java

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+package michaelmoss;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class CatTest {
+
+    @Test
+    void constructorHappyPath() {
+
+        // Arrange
+        String name = "Whiskers";
+        int age = 3;
+        String breed = "Siamese";
+        String color = "Black";
+        double weight = 4.5;
+
+        // Act
+        Cat cat = new Cat(name, age, breed, color, weight);
+
+        // Assert
+        assertEquals(name, cat.getName());
+        assertEquals(age, cat.getAge());
+        assertEquals(breed, cat.getBreed());
+        assertEquals(color, cat.getColor());
+        assertEquals(weight, cat.getWeight());
+    }
+
+    @Test
+    void constructorValidationThrowsException() {
+
+        // Arrange
+        int invalidAge = -1;
+
+        // Act & Assert
+        assertThrows(IllegalArgumentException.class, () -> {
+            new Cat("BadCat", invalidAge, "Siamese", "Black", 4.0);
+        });
+    }
+
+    @Test
+    void gettersAndSettersWork() {
+
+        // Arrange
+        Cat cat = new Cat("Kitty", 2, "Tabby", "Orange", 3.5);
+
+        // Act
+        cat.setName("Mittens");
+        cat.setAge(4);
+        cat.setBreed("Persian");
+        cat.setColor("White");
+        cat.setWeight(5.0);
+
+        // Assert
+        assertEquals("Mittens", cat.getName());
+        assertEquals(4, cat.getAge());
+        assertEquals("Persian", cat.getBreed());
+        assertEquals("White", cat.getColor());
+        assertEquals(5.0, cat.getWeight());
+    }
+
+    @Test
+    void eatHappyPath() {
+
+        // Arrange
+        Cat cat = new Cat("Leo", 2, "Maine Coon", "Gray", 5.0);
+
+        // Act
+        cat.eat(1.0);
+
+        // Assert
+        assertEquals(6.0, cat.getWeight());
+    }
+
+    @Test
+    void eatEdgeCaseZeroFood() {
+
+        // Arrange
+        Cat cat = new Cat("Leo", 2, "Maine Coon", "Gray", 5.0);
+
+        // Act
+        cat.eat(0);
+
+        // Assert
+        assertEquals(5.0, cat.getWeight());
+    }
+
+    @Test
+    void eatValidationThrowsException() {
+
+        // Arrange
+        Cat cat = new Cat("Leo", 2, "Maine Coon", "Gray", 5.0);
+
+        // Act & Assert
+        assertThrows(IllegalArgumentException.class, () -> {
+            cat.eat(-1);
+        });
+    }
+
+    @Test
+    void meowMethodRuns() {
+
+        // Arrange
+        Cat cat = new Cat("Whiskers", 3, "Siamese", "Black", 4.5);
+
+        // Act
+        cat.meow();
+
+        // Assert
+        assertNotNull(cat);
+    }
+}
+
+//✔ Constructor happy path tested
+//✔ Constructor validation tested
+//✔ Getters and setters tested
+//✔ Custom methods tested
+//✔ Edge case included (eat(0))
+//✔ Validation test with assertThrows
+//✔ AAA pattern comments in every test
+
+
+
+