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diff --git a/src/test/java/org/apache/commons/lang3/tuple/TripleTest.java b/src/test/java/org/apache/commons/lang3/tuple/TripleTest.java
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+/*
+ * 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.assertNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.util.Calendar;
+import java.util.HashSet;
+
+import org.apache.commons.lang3.AbstractLangTest;
+import org.junit.jupiter.api.Test;
+
+/**
+ * Test the Triple class.
+ */
+public class TripleTest extends AbstractLangTest {
+
+    @Test
+    public void testOfNonNull() {
+        assertThrows(NullPointerException.class, () -> Triple.ofNonNull(null, null, null));
+        assertThrows(NullPointerException.class, () -> Triple.ofNonNull(null, null, "z"));
+        assertThrows(NullPointerException.class, () -> Triple.ofNonNull(null, "y", "z"));
+        assertThrows(NullPointerException.class, () -> Triple.ofNonNull("x", null, null));
+        assertThrows(NullPointerException.class, () -> Triple.ofNonNull("x", "y", null));
+        final Triple<String, String, String> pair = Triple.ofNonNull("x", "y", "z");
+        assertEquals("x", pair.getLeft());
+        assertEquals("y", pair.getMiddle());
+        assertEquals("z", pair.getRight());
+    }
+
+    @Test
+    public void testComparable1() {
+        final Triple<String, String, String> triple1 = Triple.of("A", "D", "A");
+        final Triple<String, String, String> triple2 = Triple.of("B", "C", "A");
+        assertEquals(0, triple1.compareTo(triple1));
+        assertTrue(triple1.compareTo(triple2) < 0);
+        assertEquals(0, triple2.compareTo(triple2));
+        assertTrue(triple2.compareTo(triple1) > 0);
+    }
+
+    @Test
+    public void testComparable2() {
+        final Triple<String, String, String> triple1 = Triple.of("A", "C", "B");
+        final Triple<String, String, String> triple2 = Triple.of("A", "D", "B");
+        assertEquals(0, triple1.compareTo(triple1));
+        assertTrue(triple1.compareTo(triple2) < 0);
+        assertEquals(0, triple2.compareTo(triple2));
+        assertTrue(triple2.compareTo(triple1) > 0);
+    }
+
+    @Test
+    public void testComparable3() {
+        final Triple<String, String, String> triple1 = Triple.of("A", "A", "D");
+        final Triple<String, String, String> triple2 = Triple.of("A", "B", "C");
+        assertEquals(0, triple1.compareTo(triple1));
+        assertTrue(triple1.compareTo(triple2) < 0);
+        assertEquals(0, triple2.compareTo(triple2));
+        assertTrue(triple2.compareTo(triple1) > 0);
+    }
+
+    @Test
+    public void testComparable4() {
+        final Triple<String, String, String> triple1 = Triple.of("B", "A", "C");
+        final Triple<String, String, String> triple2 = Triple.of("B", "A", "D");
+        assertEquals(0, triple1.compareTo(triple1));
+        assertTrue(triple1.compareTo(triple2) < 0);
+        assertEquals(0, triple2.compareTo(triple2));
+        assertTrue(triple2.compareTo(triple1) > 0);
+    }
+
+    @Test
+    public void testCompatibilityBetweenTriples() {
+        final Triple<Integer, String, Boolean> triple = ImmutableTriple.of(0, "foo", Boolean.TRUE);
+        final Triple<Integer, String, Boolean> triple2 = MutableTriple.of(0, "foo", Boolean.TRUE);
+        assertEquals(triple, triple2);
+        assertEquals(triple.hashCode(), triple2.hashCode());
+        final HashSet<Triple<Integer, String, Boolean>> set = new HashSet<>();
+        set.add(triple);
+        assertTrue(set.contains(triple2));
+    }
+
+    @Test
+    public void testEmptyArrayGenerics() {
+        final Triple<Integer, String, Boolean>[] empty = Triple.emptyArray();
+        assertEquals(0, empty.length);
+    }
+
+    @Test
+    public void testEmptyArrayLength() {
+        @SuppressWarnings("unchecked")
+        final Triple<Integer, String, Boolean>[] empty = (Triple<Integer, String, Boolean>[]) Triple.EMPTY_ARRAY;
+        assertEquals(0, empty.length);
+    }
+
+    @Test
+    public void testFormattable_padded() {
+        final Triple<String, String, String> triple = Triple.of("Key", "Something", "Value");
+        assertEquals("         (Key,Something,Value)", String.format("%1$30s", triple));
+    }
+
+    @Test
+    public void testFormattable_simple() {
+        final Triple<String, String, String> triple = Triple.of("Key", "Something", "Value");
+        assertEquals("(Key,Something,Value)", String.format("%1$s", triple));
+    }
+
+    @Test
+    public void testToString() {
+        final Triple<String, String, String> triple = Triple.of("Key", "Something", "Value");
+        assertEquals("(Key,Something,Value)", triple.toString());
+    }
+
+    @Test
+    public void testToStringCustom() {
+        final Calendar date = Calendar.getInstance();
+        date.set(2011, Calendar.APRIL, 25);
+        final Triple<String, String, Calendar> triple = Triple.of("DOB", "string", date);
+        assertEquals("Test created on " + "04-25-2011", triple.toString("Test created on %3$tm-%3$td-%3$tY"));
+    }
+
+    @Test
+    public void testTripleOf() {
+        final Triple<Integer, String, Boolean> triple = Triple.of(0, "foo", Boolean.TRUE);
+        assertTrue(triple instanceof ImmutableTriple<?, ?, ?>);
+        assertEquals(0, ((ImmutableTriple<Integer, String, Boolean>) triple).left.intValue());
+        assertEquals("foo", ((ImmutableTriple<Integer, String, Boolean>) triple).middle);
+        assertEquals(Boolean.TRUE, ((ImmutableTriple<Integer, String, Boolean>) triple).right);
+        final Triple<Object, String, Long> triple2 = Triple.of(null, "bar", Long.valueOf(200L));
+        assertTrue(triple2 instanceof ImmutableTriple<?, ?, ?>);
+        assertNull(((ImmutableTriple<Object, String, Long>) triple2).left);
+        assertEquals("bar", ((ImmutableTriple<Object, String, Long>) triple2).middle);
+        assertEquals(Long.valueOf(200L), ((ImmutableTriple<Object, String, Long>) triple2).right);
+    }
+
+}
+