def ccd_data(request):
"""
Return a CCDData object with units of ADU.
The size of the data array is 100x100 but can be changed using the marker
@pytest.mark.data_size(N) on the test function, where N should be the
desired dimension.
Data values are initialized to random numbers drawn from a normal
distribution with mean of 0 and scale 1.
The scale can be changed with the marker @pytest.marker.scale(s) on the
test function, where s is the desired scale.
The mean can be changed with the marker @pytest.marker.scale(m) on the
test function, where m is the desired mean.
"""
size = value_from_markers('data_size', request)
scale = value_from_markers('data_scale', request)
mean = value_from_markers('data_mean', request)
with NumpyRNGContext(DEFAULTS['seed']):
data = np.random.normal(loc=mean, size=[size, size], scale=scale)
fake_meta = {'my_key': 42, 'your_key': 'not 42'}
ccd = CCDData(data, unit=u.adu)
ccd.header = fake_meta
return ccd
def ccd_data(request):
"""
Return a CCDData object with units of ADU.
The size of the data array is 100x100 but can be changed using the marker
@pytest.mark.data_size(N) on the test function, where N should be the
desired dimension.
Data values are initialized to random numbers drawn from a normal
distribution with mean of 0 and scale 1.
The scale can be changed with the marker @pytest.marker.scale(s) on the
test function, where s is the desired scale.
The mean can be changed with the marker @pytest.marker.scale(m) on the
test function, where m is the desired mean.
"""
size = value_from_markers('data_size', request)
scale = value_from_markers('data_scale', request)
mean = value_from_markers('data_mean', request)
with NumpyRNGContext(DEFAULTS['seed']):
data = np.random.normal(loc=mean, size=[size, size], scale=scale)
fake_meta = {'my_key': 42, 'your_key': 'not 42'}
ccd = CCDData(data, unit=u.adu)
ccd.header = fake_meta
return ccd
def test_header2meta():
hdr = fits.header.Header()
hdr['observer'] = 'Edwin Hubble'
hdr['exptime'] = '3600'
d1 = CCDData(np.ones((5, 5)), unit=u.electron)
d1.header = hdr
assert d1.meta['OBSERVER'] == 'Edwin Hubble'
assert d1.header['OBSERVER'] == 'Edwin Hubble'
def test_header2meta():
hdr = fits.header.Header()
hdr['observer'] = 'Edwin Hubble'
hdr['exptime'] = '3600'
d1 = CCDData(np.ones((5, 5)), unit=u.electron)
d1.header = hdr
assert d1.meta['OBSERVER'] == 'Edwin Hubble'
assert d1.header['OBSERVER'] == 'Edwin Hubble'
def create_ccd_data():
"""
Return a CCDData object of size DEFAULT_DATA_SIZE x DEFAULT_DATA_SIZE
with units of ADU.
"""
data = _random_array.copy()
fake_meta = {'my_key': 42, 'your_key': 'not 42'}
ccd = CCDData(data, unit=u.adu)
ccd.header = fake_meta
return ccd
