diff --git a/src/test/java/tools/jackson/core/JDKSerializabilityTest.java b/src/test/java/tools/jackson/core/JDKSerializabilityTest.java
index 4261dfba2a..571a1719c4 100644
--- a/src/test/java/tools/jackson/core/JDKSerializabilityTest.java
+++ b/src/test/java/tools/jackson/core/JDKSerializabilityTest.java
@@ -12,8 +12,6 @@
 import tools.jackson.core.util.JsonRecyclerPools;
 import tools.jackson.core.util.RecyclerPool;
 
-import static com.fasterxml.jackson.core.util.JdkSerializationTestUtils.jdkDeserialize;
-import static com.fasterxml.jackson.core.util.JdkSerializationTestUtils.jdkSerialize;
 import static org.junit.jupiter.api.Assertions.*;
 
 /**
diff --git a/src/test/java/tools/jackson/core/JUnit5TestBase.java b/src/test/java/tools/jackson/core/JUnit5TestBase.java
index c4e23ed158..f7411a3b9e 100644
--- a/src/test/java/tools/jackson/core/JUnit5TestBase.java
+++ b/src/test/java/tools/jackson/core/JUnit5TestBase.java
@@ -415,6 +415,12 @@ protected int[] calcQuads(byte[] wordBytes) {
         return result;
     }
 
+    /*
+    /**********************************************************************
+    /* Content reading, serialization
+    /**********************************************************************
+     */
+
     public static byte[] readResource(String ref)
     {
        ByteArrayOutputStream bytes = new ByteArrayOutputStream();
@@ -437,4 +443,28 @@ public static byte[] readResource(String ref)
        }
        return bytes.toByteArray();
     }
+
+    public static byte[] jdkSerialize(Object o) throws IOException
+    {
+        ByteArrayOutputStream bytes = new ByteArrayOutputStream(1000);
+        ObjectOutputStream obOut = new ObjectOutputStream(bytes);
+        obOut.writeObject(o);
+        obOut.close();
+        return bytes.toByteArray();
+    }
+
+    @SuppressWarnings("unchecked")
+    public static <T> T jdkDeserialize(byte[] raw) throws IOException
+    {
+        ObjectInputStream objIn = new ObjectInputStream(new ByteArrayInputStream(raw));
+        try {
+            return (T) objIn.readObject();
+        } catch (ClassNotFoundException e) {
+            fail("Missing class: "+e.getMessage());
+            return null;
+        } finally {
+            objIn.close();
+        }
+    }
+
 }
diff --git a/src/test/java/tools/jackson/core/util/JdkSerializationTestUtils.java b/src/test/java/tools/jackson/core/util/JdkSerializationTestUtils.java
deleted file mode 100644
index 21bcccda7e..0000000000
--- a/src/test/java/tools/jackson/core/util/JdkSerializationTestUtils.java
+++ /dev/null
@@ -1,34 +0,0 @@
-package com.fasterxml.jackson.core.util;
-
-import java.io.ByteArrayInputStream;
-import java.io.ByteArrayOutputStream;
-import java.io.IOException;
-import java.io.ObjectInputStream;
-import java.io.ObjectOutputStream;
-
-import static org.junit.jupiter.api.Assertions.fail;
-
-public class JdkSerializationTestUtils {
-    public static byte[] jdkSerialize(Object o) throws IOException
-    {
-        ByteArrayOutputStream bytes = new ByteArrayOutputStream(1000);
-        ObjectOutputStream obOut = new ObjectOutputStream(bytes);
-        obOut.writeObject(o);
-        obOut.close();
-        return bytes.toByteArray();
-    }
-
-    @SuppressWarnings("unchecked")
-    public static <T> T jdkDeserialize(byte[] raw) throws IOException
-    {
-        ObjectInputStream objIn = new ObjectInputStream(new ByteArrayInputStream(raw));
-        try {
-            return (T) objIn.readObject();
-        } catch (ClassNotFoundException e) {
-            fail("Missing class: "+e.getMessage());
-            return null;
-        } finally {
-            objIn.close();
-        }
-    }
-}
diff --git a/src/test/java/tools/jackson/core/util/TestSerializedString.java b/src/test/java/tools/jackson/core/util/TestSerializedString.java
index 083f8b0cc0..f9509eb148 100644
--- a/src/test/java/tools/jackson/core/util/TestSerializedString.java
+++ b/src/test/java/tools/jackson/core/util/TestSerializedString.java
@@ -10,8 +10,6 @@
 import tools.jackson.core.io.SerializedString;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
-import static tools.jackson.core.util.JdkSerializationTestUtils.jdkDeserialize;
-import static tools.jackson.core.util.JdkSerializationTestUtils.jdkSerialize;
 
 /**
  * Simple unit tests to try to verify that the default