[testing] Use tuples for numpy indexing

[kparzysz-quic]

Some versions of numpy disallow the following:

>>> import numpy as np
>>> a = np.zeros(10)
>>> b = [slice(None)]
>>> a[b]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IndexError: only integers, slices (`:`), ellipsis (`...`), numpy.newaxis (`None`) and integer or boolean arrays are valid indices

When b is a tuple, it works fine:

>>> a[tuple(b)]
array([0., 0., 0., 0., 0., 0., 0., 0., 0., 0.])

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