public void setDisplayName(String displayName) throws IOException {
        this.displayName = Util.fixEmptyAndTrim(displayName);
        save();
    }
@Test
    public void testSetDisplayName() throws Exception {
        final String displayName = "testDisplayName";
        StubAbstractItem i = new StubAbstractItem();
        i.setDisplayName(displayName);
        assertEquals(displayName, i.getDisplayName());
    }