Fix-up : changing the HorseStable lowercase and fixing test

Author: yafiaha

lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/HorseStable/HorseStable.java

@@ -1,4 +1,4 @@
-package com.codedifferently.lesson16.HorseStable;
+package com.codedifferently.lesson16.horseStable;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -64,11 +64,17 @@ public void addHorse(String horseName) throws StableFullException {
     horses.add(horseName);
   }
 
-  public void displayHorses() {
+  public void removeHorse(String horseName) {
+    if (!horses.contains(horseName)) {
+      throw new IllegalArgumentException("Horse not found in the stable.");
+    }
+    horses.remove(horseName);
+  }
+
+  public String displayHorses() {
     if (horses.isEmpty()) {
-      System.out.println("No horses in the stable.");
-      return;
+      return "No horses in the stable.";
     }
-    System.out.println("There are " + horses.size() + " horses in " + name + ".");
+    return "There are " + horses.size() + " horses in " + name + ".";
   }
 }

lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/HorseStable/StableFullException.java

@@ -1,4 +1,4 @@
-package com.codedifferently.lesson16.HorseStable;
+package com.codedifferently.lesson16.horseStable;
 
 public class StableFullException extends Exception {
   public StableFullException(String message) {

lesson_16/objects/objects_app/src/test/java/com/codedifferently/lesson16/HorseStableTest/HorseStableTest.java

@@ -2,8 +2,8 @@
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
-import com.codedifferently.lesson16.HorseStable.HorseStable;
-import com.codedifferently.lesson16.HorseStable.StableFullException;
+import com.codedifferently.lesson16.horseStable.HorseStable;
+import com.codedifferently.lesson16.horseStable.StableFullException;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
@@ -32,15 +32,20 @@ public void testAddHorse_Success() throws StableFullException {
   }
 
   @Test
-  public void testDisplayHorses_NoHorses() {
-    stable.displayHorses();
+  public void testDisplayHorses_NoHorses() throws StableFullException {
+    stable.addHorse("Spirit");
+    stable.addHorse("Shadow");
+    stable.removeHorse("Spirit");
+    stable.removeHorse("Shadow");
+
+    assertEquals(0, stable.getHorses().size());
   }
 
   @Test
   public void testDisplayHorses_WithHorses() throws StableFullException {
     stable.addHorse("Spirit");
     stable.addHorse("Shadow");
-    stable.displayHorses();
+    assertEquals("There are 2 horses in Sunny Acres.", stable.displayHorses());
   }
 
   @Test