Add missing test

Author: garydgregory

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

@@ -210,6 +210,12 @@ public void testCreateFile() {
         assertEquals(file, TypeHandler.createFile(file.toString()));
     }
 
+    @Test
+    public void testCreateNumber() throws ParseException {
+        assertEquals(0L, TypeHandler.createNumber("0"));
+        assertEquals(0d, TypeHandler.createNumber("0.0"));
+    }
+
     @Test
     public void testCreateFiles() {
         assertThrows(UnsupportedOperationException.class, () -> TypeHandler.createFiles(null));