public void testGetDeviceFile_with_device_node_unavailable() {
try {
tunInfo.getDeviceFile();
fail("Expected IllegalStateException");
} catch (IllegalStateException e) {
// expected
}
}
public void testGetDeviceFile_with_device_node_available() {
tunInfo.setDeviceNodeAvailable(true);
assertEquals(new File("/dev/tun"), tunInfo.getDeviceFile());
}