Add missing test

Author: garydgregory

src/main/java/org/apache/commons/cli/ParseException.java

@@ -49,6 +49,7 @@ public static ParseException wrap(final Throwable e) throws UnsupportedOperation
         }
         return new ParseException(e);
     }
+
     /**
      * Constructs a new {@code ParseException} with the specified detail message.
      *
@@ -60,6 +61,7 @@ public ParseException(final String message) {
 
     /**
      * Constructs a new {@code ParseException} wrapping the specified exception.
+     *
      * @param e the Exception to wrap.
      */
     public ParseException(final Throwable e) {

src/test/java/org/apache/commons/cli/ParseExceptionTest.java

@@ -0,0 +1,40 @@
+/*
+  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.cli;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.io.IOException;
+
+import org.junit.jupiter.api.Test;
+
+/**
+ * Tests {@link ParseException}.
+ */
+public class ParseExceptionTest {
+
+    @Test
+    public void testConstructor() {
+        assertEquals("a", new ParseException("a").getMessage());
+        final Throwable t = new IOException();
+        assertEquals(t, new ParseException(t).getCause());
+        assertEquals(t, ParseException.wrap(t).getCause());
+        final ParseException pe = new ParseException("A");
+        assertEquals(pe, ParseException.wrap(pe));
+    }
+}