feat: added function from a collection member variable

Author: haldanek

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

@@ -1,6 +1,11 @@
 package com.codedifferently.lesson16.KimberleeObject;
 
+import java.util.Arrays;
+
 public class HeadPhones {
+  @SuppressWarnings("unused")
+  private static final Object PREFERRED_BRANDS = null;
+
   private int volume = 0;
   private boolean isPoweredOn = false;
   private HeadPhoneColor headPhoneColor = HeadPhoneColor.BLACK;
@@ -16,6 +21,15 @@ public enum HeadPhoneColor {
     BLACK;
   }
 
+  public void BrandsArray() {
+    String[] brands = new String[5];
+    brands[0] = "Beats";
+    brands[1] = "Sony";
+    brands[2] = "Bose";
+    brands[3] = "SkullCandy";
+    brands[4] = "Juicy";
+  }
+
   public int getVolume(int i) {
     return volume;
   }
@@ -65,4 +79,14 @@ public void decreaseVolume() {
   public void setColor(HeadPhoneColor color) {
     this.headPhoneColor = color;
   }
+
+  public class BrandUtils {
+    private static final String[] PREFERRED_BRANDS = {
+      "Beats", "Sony", "Bose", "SkullCandy", "Juicy"
+    };
+
+    public static boolean isPreferredBrand(String brand) {
+      return Arrays.asList(PREFERRED_BRANDS).contains(brand);
+    }
+  }
 }

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

@@ -0,0 +1,11 @@
+package com.codedifferently.lesson16.KimberleeObjectTest;
+
+import java.util.function.BooleanSupplier;
+
+public class BrandsArray {
+
+  public static BooleanSupplier isPreferredBrand(String string) {
+    // TODO Auto-generated method stub
+    throw new UnsupportedOperationException("Unimplemented method 'isPreferredBrand'");
+  }
+}

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

@@ -1,7 +1,6 @@
 package com.codedifferently.lesson16.KimberleeObjectTest;
 
 import static org.junit.jupiter.api.Assertions.*;
-import static org.junit.jupiter.api.Assertions.assertArrayEquals;
 
 import com.codedifferently.lesson16.KimberleeObject.HeadPhones;
 import com.codedifferently.lesson16.KimberleeObject.HeadPhones.HeadPhoneColor;
@@ -17,15 +16,6 @@ public void setUp() {
     headphones = new HeadPhones();
   }
 
-  public void BrandsArray() {
-    String[] brands = new String[5];
-    brands[0] = "Beats";
-    brands[1] = "Sony";
-    brands[2] = "Bose";
-    brands[3] = "SkullCandy";
-    brands[4] = "Juicy";
-  }
-
   @Test
   public void testDefaultState() {
     assertEquals(0, headphones.getVolume(0), "Volume should be 0 by default.");
@@ -90,4 +80,15 @@ public void testSetColor() {
         headphones.getHeadPhoneColor(),
         "Headphone color should be set to Rose Gold.");
   }
+
+  @Test
+  public void testPreferredBrand() {
+    // Assert
+    assertTrue(BrandsArray.isPreferredBrand("Beats"), "Beats should be a preferred brand.");
+    assertTrue(BrandsArray.isPreferredBrand("Sony"), "Sony should be a preferred brand.");
+    assertFalse(BrandsArray.isPreferredBrand("Apple"), "Apple should not be a preferred brand.");
+    assertTrue(
+        BrandsArray.isPreferredBrand("SkullCandy"), "SkullCandy should be a preferred brand.");
+    assertTrue(BrandsArray.isPreferredBrand("Juicy"), "Juicy should be a preferred brand.");
+  }
 }