def test_io_inverse_operator():
    """Test IO of inverse_operator
    """
    tempdir = _TempDir()
    inverse_operator = read_inverse_operator(fname_inv)
    x = repr(inverse_operator)
    assert_true(x)
    assert_true(isinstance(inverse_operator['noise_cov'], Covariance))
    # just do one example for .gz, as it should generalize
    _compare_io(inverse_operator, '.gz')

    # test warnings on bad filenames
    with warnings.catch_warnings(record=True) as w:
        warnings.simplefilter('always')
        inv_badname = op.join(tempdir, 'test-bad-name.fif.gz')
        write_inverse_operator(inv_badname, inverse_operator)
        read_inverse_operator(inv_badname)
    assert_naming(w, 'test_inverse.py', 2)

    # make sure we can write and read
    inv_fname = op.join(tempdir, 'test-inv.fif')
    args = (10, 1. / 9., 'dSPM')
    inv_prep = prepare_inverse_operator(inverse_operator, *args)
    write_inverse_operator(inv_fname, inv_prep)
    inv_read = read_inverse_operator(inv_fname)
    _compare(inverse_operator, inv_read)
    inv_read_prep = prepare_inverse_operator(inv_read, *args)
    _compare(inv_prep, inv_read_prep)
    inv_prep_prep = prepare_inverse_operator(inv_prep, *args)
    _compare(inv_prep, inv_prep_prep)

def test_io_inverse_operator():
    """Test IO of inverse_operator."""
    tempdir = _TempDir()
    inverse_operator = read_inverse_operator(fname_inv)
    x = repr(inverse_operator)
    assert (x)
    assert (isinstance(inverse_operator['noise_cov'], Covariance))
    # just do one example for .gz, as it should generalize
    _compare_io(inverse_operator, '.gz')

    # test warnings on bad filenames
    inv_badname = op.join(tempdir, 'test-bad-name.fif.gz')
    with pytest.warns(RuntimeWarning, match='-inv.fif'):
        write_inverse_operator(inv_badname, inverse_operator)
    with pytest.warns(RuntimeWarning, match='-inv.fif'):
        read_inverse_operator(inv_badname)

    # make sure we can write and read
    inv_fname = op.join(tempdir, 'test-inv.fif')
    args = (10, 1. / 9., 'dSPM')
    inv_prep = prepare_inverse_operator(inverse_operator, *args)
    write_inverse_operator(inv_fname, inv_prep)
    inv_read = read_inverse_operator(inv_fname)
    _compare(inverse_operator, inv_read)
    inv_read_prep = prepare_inverse_operator(inv_read, *args)
    _compare(inv_prep, inv_read_prep)
    inv_prep_prep = prepare_inverse_operator(inv_prep, *args)
    _compare(inv_prep, inv_prep_prep)

def test_apply_inverse_sphere():
    """Test applying an inverse with a sphere model (rank-deficient)."""
    evoked = _get_evoked()
    evoked.pick_channels(evoked.ch_names[:306:8])
    evoked.info['projs'] = []
    cov = make_ad_hoc_cov(evoked.info)
    sphere = make_sphere_model('auto', 'auto', evoked.info)
    fwd = read_forward_solution(fname_fwd)
    vertices = [fwd['src'][0]['vertno'][::5],
                fwd['src'][1]['vertno'][::5]]
    stc = SourceEstimate(np.zeros((sum(len(v) for v in vertices), 1)),
                         vertices, 0., 1.)
    fwd = restrict_forward_to_stc(fwd, stc)
    fwd = make_forward_solution(evoked.info, fwd['mri_head_t'], fwd['src'],
                                sphere, mindist=5.)
    evoked = EvokedArray(fwd['sol']['data'].copy(), evoked.info)
    assert fwd['sol']['nrow'] == 39
    assert fwd['nsource'] == 101
    assert fwd['sol']['ncol'] == 303
    tempdir = _TempDir()
    temp_fname = op.join(tempdir, 'temp-inv.fif')
    inv = make_inverse_operator(evoked.info, fwd, cov, loose=1.)
    # This forces everything to be float32
    write_inverse_operator(temp_fname, inv)
    inv = read_inverse_operator(temp_fname)
    stc = apply_inverse(evoked, inv, method='eLORETA',
                        method_params=dict(eps=1e-2))
    # assert zero localization bias
    assert_array_equal(np.argmax(stc.data, axis=0),
                       np.repeat(np.arange(101), 3))

def test_io_inverse_operator():
    """Test IO of inverse_operator
    """
    for inv in [inverse_operator, inverse_operator_vol]:
        inv_init = copy.deepcopy(inv)
        write_inverse_operator('test-inv.fif', inv)
        this_inv = read_inverse_operator('test-inv.fif')

        _compare(inv, inv_init)
        _compare(inv, this_inv)

def test_io_inverse_operator():
    """Test IO of inverse_operator
    """
    for inv in [inverse_operator, inverse_operator_vol]:
        inv_init = copy.deepcopy(inv)
        for out_file in ['test-inv.fif', 'test-inv.fif.gz']:
            write_inverse_operator(out_file, inv)
            this_inv = read_inverse_operator(out_file)

            _compare(inv, inv_init)
            _compare(inv, this_inv)

def _compare_io(inv_op, out_file_ext='.fif'):
    if out_file_ext == '.fif':
        out_file = op.join(tempdir, 'test-inv.fif')
    elif out_file_ext == '.gz':
        out_file = op.join(tempdir, 'test-inv.fif.gz')
    else:
        raise ValueError('IO test could not complete')
    # Test io operations
    inv_init = copy.deepcopy(inv_op)
    write_inverse_operator(out_file, inv_op)
    read_inv_op = read_inverse_operator(out_file)
    _compare(inv_init, read_inv_op)
    _compare(inv_init, inv_op)

def test_io_inverse_operator():
    """Test IO of inverse_operator with GZip
    """
    inverse_operator = read_inverse_operator(fname_inv)
    # just do one example for .gz, as it should generalize
    _compare_io(inverse_operator, '.gz')

    # test warnings on bad filenames
    with warnings.catch_warnings(record=True) as w:
        warnings.simplefilter('always')
        inv_badname = op.join(tempdir, 'test-bad-name.fif.gz')
        write_inverse_operator(inv_badname, inverse_operator)
        read_inverse_operator(inv_badname)
    assert_true(len(w) == 2)

def test_apply_inverse_operator():
    """Test MNE inverse computation

    With and without precomputed inverse operator.
    """
    evoked = fiff.Evoked(fname_data, setno=0, baseline=(None, 0))

    stc = apply_inverse(evoked, inverse_operator, lambda2, "MNE")
    assert_true(stc.data.min() > 0)
    assert_true(stc.data.max() < 10e-10)
    assert_true(stc.data.mean() > 1e-11)

    stc = apply_inverse(evoked, inverse_operator, lambda2, "sLORETA")
    assert_true(stc.data.min() > 0)
    assert_true(stc.data.max() < 9.0)
    assert_true(stc.data.mean() > 0.1)

    stc = apply_inverse(evoked, inverse_operator, lambda2, "dSPM")
    assert_true(stc.data.min() > 0)
    assert_true(stc.data.max() < 35)
    assert_true(stc.data.mean() > 0.1)

    # Test MNE inverse computation starting from forward operator
    evoked = fiff.Evoked(fname_data, setno=0, baseline=(None, 0))
    fwd_op = read_forward_solution(fname_fwd, surf_ori=True)

    my_inv_op = make_inverse_operator(evoked.info, fwd_op, noise_cov,
                                      loose=0.2, depth=0.8)
    write_inverse_operator('test-inv.fif', my_inv_op)
    read_my_inv_op = read_inverse_operator('test-inv.fif')
    _compare(my_inv_op, read_my_inv_op)

    my_stc = apply_inverse(evoked, my_inv_op, lambda2, "dSPM")

    assert_true('dev_head_t' in my_inv_op['info'])
    assert_true('mri_head_t' in my_inv_op)

    assert_equal(stc.times, my_stc.times)
    assert_array_almost_equal(stc.data, my_stc.data, 2)