How to mock ConnectivityManager to perform a test?

I have a method to check if my mobile has a connection

ic static boolean thereIsConnection(Context context) {
    if(context == null)  return false;


    ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

    if (connectivityManager != null) {


        if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
            NetworkCapabilities capabilities = connectivityManager.getNetworkCapabilities(connectivityManager.getActiveNetwork());
            if (capabilities != null) {
                if (capabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)) {
                    return true;
                } else if (capabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)) {
                    return true;
                }  else if (capabilities.hasTransport(NetworkCapabilities.TRANSPORT_ETHERNET)){
                    return true;
                }
            }
        }

and I have wrote this test but I don't know why the expected output is false:

 @Test
public void thereIsConnection() {
   Context context = new MockContext();
    ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkCapabilities networkCapabilities = manager.getNetworkCapabilities(manager.getActiveNetwork());

    Mockito.when(context.getSystemService(Context.CONNECTIVITY_SERVICE)).thenReturn(manager);
    Mockito.when(manager.getNetworkCapabilities(manager.getActiveNetwork())).thenReturn(networkCapabilities);
    Mockito.when(networkCapabilities.hasCapability(NetworkCapabilities.TRANSPORT_CELLULAR)).thenReturn(true);
    Mockito.when(networkCapabilities.hasCapability(NetworkCapabilities.TRANSPORT_WIFI)).thenReturn(true);
    Mockito.when(networkCapabilities.hasCapability(NetworkCapabilities.TRANSPORT_ETHERNET)).thenReturn(true);

    Assert.assertThat(Utils.thereIsConnection(context), CoreMatchers.is(true));

    Mockito.verify(networkCapabilities).hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR);
    Mockito.verify(networkCapabilities).hasTransport(NetworkCapabilities.TRANSPORT_WIFI);
    Mockito.verify(networkCapabilities).hasTransport(NetworkCapabilities.TRANSPORT_ETHERNET);
}

I have an java.lang.UnsupportedOperationException at android.test.mock.MockContext.getSystemService(MockContext.java:616)

so my question is: how to mock Connectivity Manager?