public Object getDynamicAttr(String dynamicAttrKey) {
        return dynamicAttrs.get(dynamicAttrKey);
    }
@Test
    public void testGetDynamicAttr() {
        ProviderInfo providerInfo = new ProviderInfo();
        providerInfo.setDynamicAttr("timeout", 1);
        Assert.assertEquals("1", providerInfo.getAttr("timeout"));
    }