@Test
  public void testBuildEnvProperties() {
    appender.setInitialContextFactoryName("icfn");
    appender.setProviderURL("url");
    appender.setURLPkgPrefixes("pkgPref");
    appender.setSecurityPrincipalName("user");
    appender.setSecurityCredentials("cred");

    Properties props = appender.buildEnvProperties();
    assertEquals(5, props.size());
    assertEquals(
        appender.getInitialContextFactoryName(),
        props.getProperty(Context.INITIAL_CONTEXT_FACTORY));
    assertEquals(appender.getProviderURL(), props.getProperty(Context.PROVIDER_URL));
    assertEquals(appender.getURLPkgPrefixes(), props.getProperty(Context.URL_PKG_PREFIXES));
    assertEquals(
        appender.getSecurityPrincipalName(), props.getProperty(Context.SECURITY_PRINCIPAL));
    assertEquals(
        appender.getSecurityCredentials(), props.getProperty(Context.SECURITY_CREDENTIALS));
  }