feat: added volume increase and decrease tests/pass

Author: haldanek

lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/KimberleeObject/HeadPhones.java

@@ -1,15 +1,13 @@
 package com.codedifferently.lesson16.KimberleeObject;
 
 public class HeadPhones {
-  @SuppressWarnings("unused")
   private int volume = 0;
-
   private boolean isPoweredOn = false;
   private String HeadPhoneColor = "BLACK";
   private boolean isWireless = true;
   private String brands = "Beats";
 
-  public int getVolume(int volume) {
+  public int getVolume(int i) {
     return volume;
   }
 
@@ -36,4 +34,22 @@ public void turnOn() {
   public void turnOff() {
     isPoweredOn = false;
   }
+
+  public void increaseVolume() {
+    if (volume < 100) {
+      volume++;
+    }
+  }
+
+  public void setVolume(int volume) {
+    if (volume >= 0 && volume <= 100) {
+      this.volume = volume;
+    }
+  }
+
+  public void decreaseVolume() {
+    if (volume > 0) {
+      volume--;
+    }
+  }
 }

lesson_16/objects/objects_app/src/test/java/com/codedifferently/lesson16/KimberleeObjectTest/HeadPhonesTest.java

@@ -60,4 +60,30 @@ public void testTurnOff() {
     // Assert
     assertFalse(headphones.isPoweredOn(), "Headphones should turn off after calling");
   }
+
+  @Test
+  public void testIncreaseVolume() {
+    // Arrange
+    headphones.turnOn();
+    headphones.increaseVolume();
+    assertEquals(1, headphones.getVolume(0), "Volume should increase by 1");
+    // Act
+    headphones.setVolume(99);
+    headphones.increaseVolume();
+    // Assert
+    assertEquals(100, headphones.getVolume(0), "Volume should not exceed 100.");
+  }
+
+  @Test
+  public void testDecreaseVolume() {
+    // Arrange
+    headphones.turnOn();
+    headphones.setVolume(1);
+    headphones.decreaseVolume();
+    assertEquals(0, headphones.getVolume(0), "Volume should decrease to 0.");
+    // Act
+    headphones.decreaseVolume();
+    // Assert
+    assertEquals(0, headphones.getVolume(0), "Volume should not go lower than 0.");
+  }
 }