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diff --git a/src/test/java/org/apache/commons/lang3/tuple/MutableTripleTest.java b/src/test/java/org/apache/commons/lang3/tuple/MutableTripleTest.java
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+++ b/src/test/java/org/apache/commons/lang3/tuple/MutableTripleTest.java
@@ -0,0 +1,139 @@
+/*
+ * 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.commons.lang3.tuple;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import org.apache.commons.lang3.AbstractLangTest;
+import org.apache.commons.lang3.SerializationUtils;
+import org.junit.jupiter.api.Test;
+
+/**
+ * Test the MutableTriple class.
+ */
+public class MutableTripleTest extends AbstractLangTest {
+
+    @Test
+    public void testOfNonNull() {
+        assertThrows(NullPointerException.class, () -> MutableTriple.ofNonNull(null, null, null));
+        assertThrows(NullPointerException.class, () -> MutableTriple.ofNonNull(null, null, "z"));
+        assertThrows(NullPointerException.class, () -> MutableTriple.ofNonNull(null, "y", "z"));
+        assertThrows(NullPointerException.class, () -> MutableTriple.ofNonNull("x", null, null));
+        assertThrows(NullPointerException.class, () -> MutableTriple.ofNonNull("x", "y", null));
+        final MutableTriple<String, String, String> pair = MutableTriple.ofNonNull("x", "y", "z");
+        assertEquals("x", pair.left);
+        assertEquals("y", pair.middle);
+        assertEquals("z", pair.right);
+    }
+
+
+    @Test
+    public void testBasic() {
+        final MutableTriple<Integer, String, Boolean> triple = new MutableTriple<>(0, "foo", Boolean.FALSE);
+        assertEquals(0, triple.getLeft().intValue());
+        assertEquals("foo", triple.getMiddle());
+        assertEquals(Boolean.FALSE, triple.getRight());
+        final MutableTriple<Object, String, String> triple2 = new MutableTriple<>(null, "bar", "hello");
+        assertNull(triple2.getLeft());
+        assertEquals("bar", triple2.getMiddle());
+        assertEquals("hello", triple2.getRight());
+    }
+
+    @Test
+    public void testDefault() {
+        final MutableTriple<Integer, String, Boolean> triple = new MutableTriple<>();
+        assertNull(triple.getLeft());
+        assertNull(triple.getMiddle());
+        assertNull(triple.getRight());
+    }
+
+    @Test
+    public void testEmptyArrayGenerics() {
+        final MutableTriple<Integer, String, Boolean>[] empty = MutableTriple.emptyArray();
+        assertEquals(0, empty.length);
+    }
+
+    @Test
+    public void testEmptyArrayLength() {
+        @SuppressWarnings("unchecked")
+        final MutableTriple<Integer, String, Boolean>[] empty = (MutableTriple<Integer, String, Boolean>[]) MutableTriple.EMPTY_ARRAY;
+        assertEquals(0, empty.length);
+    }
+
+    @Test
+    public void testEquals() {
+        assertEquals(MutableTriple.of(null, "foo", "baz"), MutableTriple.of(null, "foo", "baz"));
+        assertNotEquals(MutableTriple.of("foo", 0, Boolean.TRUE), MutableTriple.of("foo", null, Boolean.TRUE));
+        assertNotEquals(MutableTriple.of("foo", "bar", "baz"), MutableTriple.of("xyz", "bar", "baz"));
+        assertNotEquals(MutableTriple.of("foo", "bar", "baz"), MutableTriple.of("foo", "bar", "blo"));
+
+        final MutableTriple<String, String, String> p = MutableTriple.of("foo", "bar", "baz");
+        assertEquals(p, p);
+        assertNotEquals(p, new Object());
+    }
+
+    @Test
+    public void testHashCode() {
+        assertEquals(MutableTriple.of(null, "foo", "baz").hashCode(), MutableTriple.of(null, "foo", "baz").hashCode());
+    }
+
+    @Test
+    public void testMutate() {
+        final MutableTriple<Integer, String, Boolean> triple = new MutableTriple<>(0, "foo", Boolean.TRUE);
+        triple.setLeft(42);
+        triple.setMiddle("bar");
+        triple.setRight(Boolean.FALSE);
+        assertEquals(42, triple.getLeft().intValue());
+        assertEquals("bar", triple.getMiddle());
+        assertEquals(Boolean.FALSE, triple.getRight());
+    }
+
+    @Test
+    public void testSerialization() throws Exception {
+        final MutableTriple<Integer, String, Boolean> origTriple = MutableTriple.of(0, "foo", Boolean.TRUE);
+        final MutableTriple<Integer, String, Boolean> deserializedTriple = SerializationUtils.roundtrip(origTriple);
+        assertEquals(origTriple, deserializedTriple);
+        assertEquals(origTriple.hashCode(), deserializedTriple.hashCode());
+    }
+
+    @Test
+    public void testToString() {
+        assertEquals("(null,null,null)", MutableTriple.of(null, null, null).toString());
+        assertEquals("(null,two,null)", MutableTriple.of(null, "two", null).toString());
+        assertEquals("(one,null,null)", MutableTriple.of("one", null, null).toString());
+        assertEquals("(one,two,null)", MutableTriple.of("one", "two", null).toString());
+        assertEquals("(null,two,three)", MutableTriple.of(null, "two", "three").toString());
+        assertEquals("(one,null,three)", MutableTriple.of("one", null, "three").toString());
+        assertEquals("(one,two,three)", MutableTriple.of("one", "two", "three").toString());
+    }
+
+    @Test
+    public void testTripleOf() {
+        final MutableTriple<Integer, String, Boolean> triple = MutableTriple.of(0, "foo", Boolean.TRUE);
+        assertEquals(0, triple.getLeft().intValue());
+        assertEquals("foo", triple.getMiddle());
+        assertEquals(Boolean.TRUE, triple.getRight());
+        final MutableTriple<Object, String, String> triple2 = MutableTriple.of(null, "bar", "hello");
+        assertNull(triple2.getLeft());
+        assertEquals("bar", triple2.getMiddle());
+        assertEquals("hello", triple2.getRight());
+    }
+}
+