Fix

Author: Hardvan

src/test/java/com/thealgorithms/datastructures/lists/SortedLinkedListTest.java

@@ -116,6 +116,12 @@ public void testIsEmptyOnNonEmptyList() {
         assertFalse(list.isEmpty());
     }
 
+    @Test
+    public void testIsEmptyAfterInsertion() {
+        list.insert(10);
+        assertFalse(list.isEmpty());
+    }
+
     @Test
     public void testIsEmptyAfterDeletion() {
         list.insert(10);