diff --git a/spring-core/src/test/java/org/springframework/util/xml/AbstractStaxHandlerTestCase.java b/spring-core/src/test/java/org/springframework/util/xml/AbstractStaxHandlerTestCase.java
index e498652365..026dd5ffcf 100644
--- a/spring-core/src/test/java/org/springframework/util/xml/AbstractStaxHandlerTestCase.java
+++ b/spring-core/src/test/java/org/springframework/util/xml/AbstractStaxHandlerTestCase.java
@@ -20,9 +20,11 @@ import org.junit.Assume;
 import org.junit.Before;
 import org.junit.Test;
 import org.w3c.dom.Document;
+import org.w3c.dom.Node;
 import org.xml.sax.InputSource;
 import org.xml.sax.XMLReader;
 import org.xml.sax.helpers.XMLReaderFactory;
+import org.xmlunit.util.Predicate;
 
 import javax.xml.parsers.DocumentBuilder;
 import javax.xml.parsers.DocumentBuilderFactory;
@@ -58,6 +60,9 @@ public abstract class AbstractStaxHandlerTestCase {
 
 	private XMLReader xmlReader;
 
+	private Predicate<Node> nodeFilter = n -> n.getNodeType() != Node.COMMENT_NODE
+			&& n.getNodeType() != Node.DOCUMENT_TYPE_NODE && n.getNodeType() != Node.PROCESSING_INSTRUCTION_NODE;
+
 	@Before
 	public void createXMLReader() throws Exception {
 		xmlReader = XMLReaderFactory.createXMLReader();
@@ -77,7 +82,7 @@ public abstract class AbstractStaxHandlerTestCase {
 
 		xmlReader.parse(new InputSource(new StringReader(COMPLEX_XML)));
 
-		assertThat(stringWriter.toString(), isSimilarTo(COMPLEX_XML));
+		assertThat(stringWriter.toString(), isSimilarTo(COMPLEX_XML).withNodeFilter(nodeFilter));
 	}
 
 	private static boolean wwwSpringframeworkOrgIsAccessible() {
@@ -104,7 +109,7 @@ public abstract class AbstractStaxHandlerTestCase {
 
 		xmlReader.parse(new InputSource(new StringReader(COMPLEX_XML)));
 
-		assertThat(stringWriter.toString(), isSimilarTo(COMPLEX_XML));
+		assertThat(stringWriter.toString(), isSimilarTo(COMPLEX_XML).withNodeFilter(nodeFilter));
 	}
 
 	@Test
@@ -126,7 +131,7 @@ public abstract class AbstractStaxHandlerTestCase {
 
 		xmlReader.parse(new InputSource(new StringReader(SIMPLE_XML)));
 
-		assertThat(result, isSimilarTo(expected));
+		assertThat(result, isSimilarTo(expected).withNodeFilter(nodeFilter));
 	}
 
 	@Test
@@ -148,7 +153,7 @@ public abstract class AbstractStaxHandlerTestCase {
 
 		xmlReader.parse(new InputSource(new StringReader(SIMPLE_XML)));
 
-		assertThat(expected, isSimilarTo(result));
+		assertThat(expected, isSimilarTo(result).withNodeFilter(nodeFilter));
 	}