### Question:
OpenstackIdentity { public String getCredendials() { return this.credentials; } OpenstackIdentity(String identity, String keyStoneVersion); String getCredendials(); String getTenant(); String getTenantDomain();  }### Answer:
@Test public void testOpenstackIdentityNullOrEmpty() { Assert.assertEquals("", new OpenstackIdentity("", null).getCredendials()); Assert.assertEquals("", new OpenstackIdentity("", "").getCredendials()); Assert.assertEquals("", new OpenstackIdentity("", "3").getCredendials()); }