def test_histogram_can_not_set_x():
"""We cannot change the x accessor"""
xlo = [10, 20, 40, 80]
xhi = [20, 40, 60, 90]
y = [1, 2, 3, 4]
d = Data1DInt('xx', xlo, xhi, y)
dp = sherpaplot.DataHistogramPlot()
dp.prepare(d)
with pytest.raises(AttributeError):
dp.x = xlo
def test_histogram_returns_x():
"""We support x accessor for histogram plots."""
xlo = [10, 20, 40, 80]
xhi = [20, 40, 60, 90]
y = [1, 2, 3, 4]
d = Data1DInt('xx', xlo, xhi, y)
dp = sherpaplot.DataHistogramPlot()
dp.prepare(d)
xlo = numpy.asarray(xlo)
xhi = numpy.asarray(xhi)
assert dp.xlo == pytest.approx(xlo)
assert dp.xhi == pytest.approx(xhi)
assert dp.x == pytest.approx(0.5 * (xlo + xhi))
# check x is not in the str output
#
for line in str(dp).split('\n'):
toks = line.split()
assert len(toks) > 2
assert toks[0] != 'x'
def test_histogram_empty_x():
"""x accessor is None if there's no data"""
dp = sherpaplot.DataHistogramPlot()
assert dp.x is None