diff --git a/assignment/src/test/java/appointmentplanner/customlist/api/CustomLinkedListTest.java b/assignment/src/test/java/appointmentplanner/customlist/api/CustomLinkedListTest.java
index 9fa839d..7884b66 100644
--- a/assignment/src/test/java/appointmentplanner/customlist/api/CustomLinkedListTest.java
+++ b/assignment/src/test/java/appointmentplanner/customlist/api/CustomLinkedListTest.java
@@ -10,7 +10,6 @@ import org.junit.jupiter.params.converter.ConvertWith;
 import org.junit.jupiter.params.provider.Arguments;
 import org.junit.jupiter.params.provider.CsvSource;
 import org.junit.jupiter.params.provider.MethodSource;
-import org.junit.jupiter.params.provider.MethodSources;
 
 import appointmentplanner.StringArrayConverter;
 import appointmentplanner.customlist.CustomLinkedListImpl;
@@ -68,7 +67,7 @@ public class CustomLinkedListTest {
     assertThat(list.contains(toRemove)).isFalse();
   }
 
-  private static enum LlGetPosition {
+  private static enum LlItemPosition {
     BEFORE, AFTER
   }
 
@@ -76,16 +75,16 @@ public class CustomLinkedListTest {
 
   private static Stream<Arguments> getAfterBeforeData() {
     return Stream.of(
-        Arguments.of(someBasicDataSet, LlGetPosition.BEFORE, "MUJ", "O"),
-        Arguments.of(someBasicDataSet, LlGetPosition.AFTER, "MUJ", "BOZE"),
-        Arguments.of(someBasicDataSet, LlGetPosition.AFTER, "O", "MUJ"),
-        Arguments.of(someBasicDataSet, LlGetPosition.AFTER, "BOZE", null),
-        Arguments.of(someBasicDataSet, LlGetPosition.BEFORE, "O", null));
+        Arguments.of(someBasicDataSet, LlItemPosition.BEFORE, "MUJ", "O"),
+        Arguments.of(someBasicDataSet, LlItemPosition.AFTER, "MUJ", "BOZE"),
+        Arguments.of(someBasicDataSet, LlItemPosition.AFTER, "O", "MUJ"),
+        Arguments.of(someBasicDataSet, LlItemPosition.AFTER, "BOZE", null),
+        Arguments.of(someBasicDataSet, LlItemPosition.BEFORE, "O", null));
   }
 
   @ParameterizedTest
   @MethodSource("getAfterBeforeData")
-  void cllGetAfter_shouldReturnCorrectResult(String[] data, LlGetPosition position, String reference,
+  void cllGetAfter_shouldReturnCorrectResult(String[] data, LlItemPosition position, String reference,
       String expectedResult) {
 
     CustomLinkedList<String> list = new CustomLinkedListImpl<>();
@@ -107,4 +106,49 @@ public class CustomLinkedListTest {
 
   }
 
+  private static Stream<Arguments> insertBeforeAfterData() {
+    return Stream.of(
+        Arguments.of(someBasicDataSet, "DOPRDELE", "BOZE", LlItemPosition.AFTER),
+        Arguments.of(new String[] { "Ahoj" }, "vole", "Ahoj", LlItemPosition.AFTER),
+        Arguments.of(new String[] { "ahoj" }, "More", "ahoj", LlItemPosition.BEFORE),
+        Arguments.of(new String[] { "A", "tak", "se", "pochcal", "posral", "a", "jeste", "nakonec", "serval" },
+            "vyblil",
+            "posral", LlItemPosition.BEFORE),
+        Arguments.of(new String[] { "A", "tak", "se", "pochcal", "posral", "a", "jeste", "nakonec", "serval" },
+            "vyblil",
+            "posral", LlItemPosition.AFTER),
+        Arguments.of(someBasicDataSet, "PREMOCNY", "BOZE", LlItemPosition.BEFORE));
+  }
+
+  @ParameterizedTest
+  @MethodSource("insertBeforeAfterData")
+  void cllInsertAfterBefore_shouldInsertItemSuccessfully(String[] initData, String toInsert, String reference,
+      LlItemPosition position) {
+
+    CustomLinkedList<String> list = initPopulaterList(initData);
+
+    switch (position) {
+      case AFTER:
+        list.insertAfter(reference, toInsert);
+        assertThat(list.getAfter(reference)).isEqualTo(toInsert);
+        break;
+
+      case BEFORE:
+        list.insertBefore(reference, toInsert);
+        assertThat(list.getBefore(reference)).isEqualTo(toInsert);
+        break;
+
+      default:
+        fail("Incorrect position parameter");
+        break;
+    }
+
+  }
+
+  private CustomLinkedList<String> initPopulaterList(String[] initData) {
+    CustomLinkedList<String> list = new CustomLinkedListImpl<>();
+    Stream.of(initData).forEach(list::add);
+    return list;
+  }
+
 }