writer.write("1.2.3.4 HOST1\n");
            writer.write("192.168.1.100 HOST2\n");
            writer.write("255.255.255.255 HOST3\n");
            writer.write("10.0.0.1 HOST4\n");
        }

        when(mockConfig.getLmHostsFileName()).thenReturn(lmhostsFile.getAbsolutePath());

        // Use getByName to trigger populate
        assertNotNull(lmhosts.getByName("HOST1", mockContext));