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import numpy as np
import pytest
from pyecsca.sca import Trace, trim, reverse, pad, stretch
@pytest.fixture()
def trace():
return Trace(np.array([10, 20, 30, 40, 50], dtype=np.dtype("i1")))
def test_trim(trace):
result = trim(trace, 2)
assert result is not None
np.testing.assert_equal(
result.samples, np.array([30, 40, 50], dtype=np.dtype("i1"))
)
result = trim(trace, end=3)
assert result is not None
np.testing.assert_equal(
result.samples, np.array([10, 20, 30], dtype=np.dtype("i1"))
)
with pytest.raises(ValueError):
trim(trace, 5, 1)
def test_reverse(trace):
result = reverse(trace)
assert result is not None
np.testing.assert_equal(
result.samples, np.array([50, 40, 30, 20, 10], dtype=np.dtype("i1"))
)
def test_pad(trace):
result = pad(trace, 2)
assert result is not None
np.testing.assert_equal(
result.samples,
np.array([0, 0, 10, 20, 30, 40, 50, 0, 0], dtype=np.dtype("i1")),
)
result = pad(trace, (1, 3))
assert result is not None
np.testing.assert_equal(
result.samples,
np.array([0, 10, 20, 30, 40, 50, 0, 0, 0], dtype=np.dtype("i1")),
)
def test_stretch(trace):
result = stretch(trace, 10)
assert result is not None
assert np.min(result) == min(trace)
assert np.max(result) == max(trace)
assert len(result) == 10
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