diff --git a/test/aud/exam/prep/list/DoubleListItemProcessorTest.java b/test/aud/exam/prep/list/DoubleListItemProcessorTest.java
new file mode 100644
index 0000000..85be768
--- /dev/null
+++ b/test/aud/exam/prep/list/DoubleListItemProcessorTest.java
@@ -0,0 +1,51 @@
+package aud.exam.prep.list;
+
+import aud.exam.prep.SequenceProcessor;
+import aud.exam.prep.SequenceProcessorTest;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+abstract class DoubleListItemProcessorTest extends SequenceProcessorTest<DoubleListItem<Integer>> {
+
+    protected DoubleListItemProcessorTest(SequenceProcessor<Integer, DoubleListItem<Integer>> processor) {
+        super(processor);
+    }
+
+    @Test
+    void testThat_checkOfNullIsTrue() {
+        assertTrue(processor.check(null));
+    }
+
+    @Test
+    void testThat_checkOfNoKeyIsFalse() {
+        var item = new DoubleListItem<Integer>();
+        assertFalse(processor.check(item));
+    }
+
+    @Test
+    void testThat_checkOfNoPrevOfNextIsFalse() {
+        var item = new DoubleListItem<Integer>();
+        item.key = 1;
+
+        item.next = new DoubleListItem<>();
+        item.next.key = 1;
+
+        assertFalse(processor.check(item));
+    }
+
+    @Test
+    void testThat_checkOfCircleIsFalse() {
+        var item = new DoubleListItem<Integer>();
+        item.next = item;
+        assertFalse(processor.check(item));
+    }
+
+    @Test
+    void testThat_checkPrevNextNotMatchingIsFalse() {
+        var item = new DoubleListItem<Integer>();
+        item.next = new DoubleListItem<>();
+        item.next.prev = new DoubleListItem<>();
+        assertFalse(processor.check(item));
+    }
+}
\ No newline at end of file
diff --git a/test/aud/exam/prep/list/RecursiveDoubleListItemProcessorTest.java b/test/aud/exam/prep/list/RecursiveDoubleListItemProcessorTest.java
index 60ab264..e3d8d09 100644
--- a/test/aud/exam/prep/list/RecursiveDoubleListItemProcessorTest.java
+++ b/test/aud/exam/prep/list/RecursiveDoubleListItemProcessorTest.java
@@ -1,10 +1,8 @@
 package aud.exam.prep.list;
 
-import aud.exam.prep.SequenceProcessorTest;
-
-class RecursiveDoubleListItemProcessorTest extends SequenceProcessorTest<DoubleListItem<Integer>> {
+public class RecursiveDoubleListItemProcessorTest extends DoubleListItemProcessorTest {
 
     protected RecursiveDoubleListItemProcessorTest() {
         super(new RecursiveDoubleListItemProcessor<>());
     }
-}
\ No newline at end of file
+}