diff --git a/impl/maven-core/src/test/java/org/apache/maven/plugin/CacheUtilsTest.java b/impl/maven-core/src/test/java/org/apache/maven/plugin/CacheUtilsTest.java
new file mode 100644
index 000000000000..fc8b72285a4e
--- /dev/null
+++ b/impl/maven-core/src/test/java/org/apache/maven/plugin/CacheUtilsTest.java
@@ -0,0 +1,123 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.maven.plugin;
+
+import org.apache.maven.model.Dependency;
+import org.apache.maven.model.Plugin;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class CacheUtilsTest {
+
+    private Plugin pluginOne = new Plugin();
+    private Plugin pluginTwo = new Plugin();
+
+    @Test
+    void testPluginEqualsEmptyPlugins() {
+        assertTrue(CacheUtils.pluginEquals(pluginOne, pluginOne));
+        assertTrue(CacheUtils.pluginEquals(pluginOne, pluginTwo));
+    }
+
+    @Test
+    void testPluginEqualsSetArtifactId() {
+        pluginOne.setArtifactId("myArtifact");
+
+        assertTrue(CacheUtils.pluginEquals(pluginOne, pluginOne));
+        assertFalse(CacheUtils.pluginEquals(pluginOne, pluginTwo));
+
+        pluginTwo.setArtifactId("myArtifact");
+
+        assertTrue(CacheUtils.pluginEquals(pluginOne, pluginOne));
+        assertTrue(CacheUtils.pluginEquals(pluginOne, pluginTwo));
+    }
+
+    @Test
+    void testPluginEqualsSetGroupId() {
+        pluginOne.setGroupId("myGroupId");
+
+        assertTrue(CacheUtils.pluginEquals(pluginOne, pluginOne));
+        assertFalse(CacheUtils.pluginEquals(pluginOne, pluginTwo));
+
+        pluginTwo.setGroupId("myGroupId");
+
+        assertTrue(CacheUtils.pluginEquals(pluginOne, pluginOne));
+        assertTrue(CacheUtils.pluginEquals(pluginOne, pluginTwo));
+    }
+
+    @Test
+    void testPluginEqualsSetVersion() {
+        pluginOne.setVersion("myVersion");
+
+        assertTrue(CacheUtils.pluginEquals(pluginOne, pluginOne));
+        assertFalse(CacheUtils.pluginEquals(pluginOne, pluginTwo));
+
+        pluginTwo.setVersion("myVersion");
+
+        assertTrue(CacheUtils.pluginEquals(pluginOne, pluginOne));
+        assertTrue(CacheUtils.pluginEquals(pluginOne, pluginTwo));
+    }
+
+    @Test
+    void testPluginEqualsSetExtension() {
+        pluginOne.setExtensions("true");
+
+        assertTrue(CacheUtils.pluginEquals(pluginOne, pluginOne));
+        assertFalse(CacheUtils.pluginEquals(pluginOne, pluginTwo));
+
+        pluginTwo.setExtensions("TRUE");
+    }
+
+    @Test
+    void testPluginEqualsSetDependency() {
+        Dependency dependencyOne = new Dependency();
+        pluginOne.addDependency(dependencyOne);
+
+        assertTrue(CacheUtils.pluginEquals(pluginOne, pluginOne));
+        assertFalse(CacheUtils.pluginEquals(pluginOne, pluginTwo));
+
+        Dependency dependencyTwo = new Dependency();
+        pluginTwo.addDependency(dependencyTwo);
+
+        assertTrue(CacheUtils.pluginEquals(pluginOne, pluginOne));
+        assertTrue(CacheUtils.pluginEquals(pluginOne, pluginTwo));
+
+        dependencyTwo.setGroupId("myDependencyGroupId");
+
+        assertTrue(CacheUtils.pluginEquals(pluginOne, pluginOne));
+        assertFalse(CacheUtils.pluginEquals(pluginOne, pluginTwo));
+
+        dependencyOne.setGroupId("myDependencyGroupId");
+        dependencyTwo.setArtifactId("myDependencyArtifactId");
+
+        assertTrue(CacheUtils.pluginEquals(pluginOne, pluginOne));
+        assertFalse(CacheUtils.pluginEquals(pluginOne, pluginTwo));
+
+        dependencyTwo.setVersion("myDependencyVersion");
+
+        assertTrue(CacheUtils.pluginEquals(pluginOne, pluginOne));
+        assertFalse(CacheUtils.pluginEquals(pluginOne, pluginTwo));
+
+        dependencyOne.setArtifactId("myDependencyArtifactId");
+        dependencyTwo.setVersion("myDependencyVersion");
+
+        assertTrue(CacheUtils.pluginEquals(pluginOne, pluginOne));
+        assertFalse(CacheUtils.pluginEquals(pluginOne, pluginTwo));
+    }
+}
diff --git a/impl/maven-xml/src/test/java/org/apache/maven/internal/xml/XmlNodeBuilderTest.java b/impl/maven-xml/src/test/java/org/apache/maven/internal/xml/XmlNodeBuilderTest.java
index 7dfd0f9de803..3463be67134a 100644
--- a/impl/maven-xml/src/test/java/org/apache/maven/internal/xml/XmlNodeBuilderTest.java
+++ b/impl/maven-xml/src/test/java/org/apache/maven/internal/xml/XmlNodeBuilderTest.java
@@ -21,8 +21,10 @@
 import javax.xml.stream.XMLInputFactory;
 import javax.xml.stream.XMLStreamReader;
 
+import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.io.StringReader;
+import java.nio.charset.StandardCharsets;
 
 import org.apache.maven.api.xml.XmlNode;
 import org.apache.maven.api.xml.XmlService;
@@ -44,6 +46,10 @@ public int read(char[] cbuf, int off, int len) throws IOException {
         XmlNode node1 = XmlService.read(r);
         XmlNode node2 = XmlService.read(r);
         assertEquals(node1, node2);
+
+        XmlNode node3 = XmlService.read(new ByteArrayInputStream(doc.getBytes(StandardCharsets.UTF_8)), null);
+        XmlNode node4 = XmlService.read(new ByteArrayInputStream(doc.getBytes(StandardCharsets.UTF_8)), null);
+        assertEquals(node3, node4);
     }
 
     @Test