diff --git a/core/src/test/java/hudson/slaves/NodeListTest.java b/core/src/test/java/hudson/slaves/NodeListTest.java
deleted file mode 100644
index aef20d4028..0000000000
--- a/core/src/test/java/hudson/slaves/NodeListTest.java
+++ /dev/null
@@ -1,76 +0,0 @@
-/*
- * The MIT License
- *
- * Copyright (c) 2004-2009, Sun Microsystems, Inc., Kohsuke Kawaguchi
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-
-package hudson.slaves;
-
-import static org.junit.jupiter.api.Assertions.assertEquals;
-import static org.junit.jupiter.api.Assertions.assertTrue;
-import static org.mockito.Mockito.CALLS_REAL_METHODS;
-import static org.mockito.Mockito.mock;
-import static org.mockito.Mockito.when;
-import static org.mockito.Mockito.withSettings;
-
-import hudson.XmlFile;
-import hudson.model.Node;
-import java.io.File;
-import java.nio.charset.Charset;
-import jenkins.model.Jenkins;
-import org.apache.commons.io.FileUtils;
-import org.junit.jupiter.api.Test;
-
-/**
- * @author Kohsuke Kawaguchi
- */
-public class NodeListTest {
-
-    @Test
-    public void serialization() throws Exception {
-        // create a normal and an ephemeral class, which should not be serialized
-        Node dummyNode = mock(Node.class, withSettings().serializable().defaultAnswer(CALLS_REAL_METHODS));
-        when(dummyNode.getNodeName()).thenReturn("node1");
-        Node ephemeralNode = mock(Node.class, withSettings().extraInterfaces(EphemeralNode.class).defaultAnswer(CALLS_REAL_METHODS));
-        when(ephemeralNode.getNodeName()).thenReturn("node2");
-        NodeList nl = new NodeList(dummyNode, ephemeralNode);
-
-        File tmp = File.createTempFile("test", "test");
-        try {
-            XmlFile x = new XmlFile(Jenkins.XSTREAM, tmp);
-            x.write(nl);
-
-            String xml = FileUtils.readFileToString(tmp, Charset.defaultCharset());
-            // check that at least some content
-            assertTrue(xml.split("\n").length > 6);
-
-            NodeList back = (NodeList) x.read();
-
-            // there should only be the 'normal' node
-            assertEquals(1, back.size());
-            assertEquals(dummyNode.getClass(), back.get(0).getClass());
-        } finally {
-            if (!tmp.delete()) {
-                System.out.println("unable to delete File: " + tmp.getName());
-            }
-        }
-    }
-}