final NullArgumentException nullArgumentException = new NullArgumentException("hoge");
        assertThat(nullArgumentException.getArgName(), is("hoge"));
        assertThat(nullArgumentException.getMessage(), is("[ECL0008]argument[hoge] is null."));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testErrorMessage_en() throws Exception {
        // ## Arrange ##

     * .
     */
    @Test
    public void testLoadPropertiesInputStreamPropsNull() {
        exception.expect(NullArgumentException.class);
        exception.expectMessage(is("[ECL0008]argument[props] is null."));
        final InputStream inputStream = ResourceUtil.getResourceAsStream("org/codelibs/core/io/test.properties");
        PropertiesUtil.load(null, inputStream);
    }

    /**

     *
     * @param argName
     *            Name of the argument that is {@code null}
     */
    public NullArgumentException(final String argName) {
        super(argName, "ECL0008", asArray(argName));
    }

     * .
     */
    @Test
    public void testCreateAndCopySrcNull() {
        exception.expect(NullArgumentException.class);
        exception.expectMessage(is("[ECL0008]argument[calendar] is null."));
        CalendarConversionUtil.localize(null);
    }

     * .
     */
    @Test
    public void testAssertArgumentNotNull() {
        exception.expect(NullArgumentException.class);
        exception.expectMessage(is("[ECL0008]argument[hoge] is null."));
        assertArgumentNotNull("hoge", null);
    }

    /**
     * Test method for
     * {@link org.codelibs.core.misc.AssertionUtil#assertArgument(String, boolean, String)}
     * .

        exception.expectMessage(is("[ECL0008]argument[src] is null."));
        BeanUtil.copyMapToBean(null, new Object());
    }

    /**
     *
     */
    @Test
    public void testCopyBeanToMap_DestNull() {
        exception.expect(NullArgumentException.class);
        exception.expectMessage(is("[ECL0008]argument[dest] is null."));
        BeanUtil.copyBeanToMap(new Object(), null);

     * .
     */
    @Test
    public void testCopyDestNull() {
        exception.expect(NullArgumentException.class);
        exception.expectMessage(is("[ECL0008]argument[enumeration] is null."));
        new EnumerationIterator<Object>(null);
    }