1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
|
# Licensed under a 3-clause BSD style license - see LICENSE.rst
"""Testing :mod:`astropy.cosmology.w0wzcdm`."""
import numpy as np
import pytest
import astropy.units as u
from astropy.cosmology import Flatw0wzCDM, w0wzCDM
from astropy.cosmology._src.parameter import Parameter
from astropy.cosmology._src.tests.test_core import ParameterTestMixin, make_valid_zs
from astropy.utils.compat.optional_deps import HAS_SCIPY
from .conftest import filter_keys_from_items
from .test_base import FlatFLRWMixinTest, FLRWTest
from .test_w0cdm import Parameterw0TestMixin
##############################################################################
# PARAMETERS
COMOVING_DISTANCE_EXAMPLE_KWARGS = {"w0": -0.9, "wz": 0.1, "Tcmb0": 0.0}
valid_zs = make_valid_zs(max_z=400)[-1]
##############################################################################
# TESTS
##############################################################################
class ParameterwzTestMixin(ParameterTestMixin):
"""Tests for `astropy.cosmology.Parameter` wz on a Cosmology.
wz is a descriptor, which are tested by mixin, here with ``TestFLRW``.
These tests expect dicts ``_cls_args`` and ``cls_kwargs`` which give the
args and kwargs for the cosmology class, respectively. See ``TestFLRW``.
"""
def test_wz(self, cosmo_cls, cosmo):
"""Test Parameter ``wz``."""
# on the class
wz = cosmo_cls.parameters["wz"]
assert isinstance(wz, Parameter)
assert "Derivative of the dark energy" in wz.__doc__
assert wz.unit is None
assert wz.default == 0.0
# on the instance
assert cosmo.wz is cosmo.__dict__["wz"]
assert cosmo.wz == self.cls_kwargs["wz"]
def test_init_wz(self, cosmo_cls, ba):
"""Test initialization for values of ``wz``."""
# test that it works with units
ba.arguments["wz"] = ba.arguments["wz"] << u.one # ensure units
cosmo = cosmo_cls(*ba.args, **ba.kwargs)
assert cosmo.wz == ba.arguments["wz"]
# also without units
ba.arguments["wz"] = ba.arguments["wz"].value # strip units
cosmo = cosmo_cls(*ba.args, **ba.kwargs)
assert cosmo.wz == ba.arguments["wz"]
# must be dimensionless
ba.arguments["wz"] = 10 * u.km
with pytest.raises(TypeError):
cosmo_cls(*ba.args, **ba.kwargs)
class Testw0wzCDM(FLRWTest, Parameterw0TestMixin, ParameterwzTestMixin):
"""Test :class:`astropy.cosmology.w0wzCDM`."""
def setup_class(self):
"""Setup for testing."""
super().setup_class(self)
self.cls = w0wzCDM
self.cls_kwargs.update(w0=-1, wz=0.5)
# ===============================================================
# Method & Attribute Tests
def test_clone_change_param(self, cosmo):
"""Test method ``.clone()`` changing a(many) Parameter(s)."""
super().test_clone_change_param(cosmo)
# `w` params
c = cosmo.clone(w0=0.1, wz=0.2)
assert c.w0 == 0.1
assert c.wz == 0.2
for n, v in filter_keys_from_items(c.parameters, ("w0", "wz")):
assert u.allclose(v, getattr(cosmo, n), atol=1e-4 * getattr(v, "unit", 1))
# @pytest.mark.parametrize("z", valid_zs) # TODO! recompute comparisons below
def test_w(self, cosmo):
"""Test :meth:`astropy.cosmology.w0wzCDM.w`."""
# super().test_w(cosmo, z)
assert u.allclose(cosmo.w(1.0), -0.5)
assert u.allclose(
cosmo.w([0.0, 0.5, 1.0, 1.5, 2.3]), [-1.0, -0.75, -0.5, -0.25, 0.15]
)
def test_repr(self, cosmo_cls, cosmo):
"""Test method ``.__repr__()``."""
assert repr(cosmo) == (
"w0wzCDM(name='ABCMeta', H0=<Quantity 70. km / (Mpc s)>, Om0=0.27, "
"Ode0=0.73, Tcmb0=<Quantity 3. K>, Neff=3.04, "
"m_nu=<Quantity [0., 0., 0.] eV>, Ob0=0.03, w0=-1.0, wz=0.5)"
)
# ---------------------------------------------------------------
@pytest.mark.parametrize("z", valid_zs)
def test_Otot(self, cosmo, z):
"""Test :meth:`astropy.cosmology.w0wzCDM.Otot`.
This is tested in the base class, but we need to override it here because
this class is quite unstable.
"""
super().test_Otot(cosmo, z)
@pytest.mark.xfail(reason="Doesn't work on armel")
def test_Otot_overflow(self, cosmo):
"""Test :meth:`astropy.cosmology.w0wzCDM.Otot` for overflow."""
with (
np.errstate(invalid="ignore", over="warn"),
pytest.warns(RuntimeWarning, match="overflow encountered in exp"),
):
cosmo.Otot(1e3)
# ===============================================================
# I/O Tests
@pytest.mark.filterwarnings("ignore:overflow encountered")
def test_toformat_model(self, cosmo, to_format, method_name):
"""Test cosmology -> astropy.model."""
super().test_toformat_model(cosmo, to_format, method_name)
# ===============================================================
# Usage Tests
@pytest.mark.skipif(not HAS_SCIPY, reason="scipy is not installed")
@pytest.mark.parametrize(
("args", "kwargs", "expected"),
[
( # no relativistic species
(75.0, 0.3, 0.6),
{},
[2934.20187523, 4559.94636182, 5590.71080419, 6312.66783729] * u.Mpc,
),
( # massless neutrinos
(75.0, 0.25, 0.5),
{"Tcmb0": 3.0, "Neff": 3, "m_nu": 0 * u.eV},
[2904.47062713, 4528.59073707, 5575.95892989, 6318.98689566] * u.Mpc,
),
( # massive neutrinos
(75.0, 0.25, 0.5),
{"Tcmb0": 3.0, "Neff": 4, "m_nu": 5 * u.eV},
[2613.84726408, 3849.66574595, 4585.51172509, 5085.16795412] * u.Mpc,
),
],
)
def test_comoving_distance_example(self, cosmo_cls, args, kwargs, expected):
"""Test :meth:`astropy.cosmology.LambdaCDM.comoving_distance`.
These do not come from external codes -- they are just internal checks to make
sure nothing changes if we muck with the distance calculators.
"""
super().test_comoving_distance_example(
cosmo_cls, args, {**COMOVING_DISTANCE_EXAMPLE_KWARGS, **kwargs}, expected
)
@pytest.mark.skipif(not HAS_SCIPY, reason="scipy is not installed")
def test_comoving_distance_mathematica(self, cosmo_cls):
"""Test with Mathematica example.
This test should be updated as the code changes.
::
In[1]:= {Om0, w0, wz, H0, c}={0.3,-0.9, 0.2, 70, 299792.458};
c/H0 NIntegrate[1/Sqrt[Om0*(1+z)^3+(1-Om0)(1+z)^(3(1+w0-wz)) Exp[3 *wz*z]],{z, 0, 0.5}]
Out[1]= 1849.75
"""
assert u.allclose(
cosmo_cls(H0=70, Om0=0.3, w0=-0.9, wz=0.2, Ode0=0.7).comoving_distance(0.5),
1849.75 * u.Mpc,
rtol=1e-4,
)
class TestFlatw0wzCDM(FlatFLRWMixinTest, Testw0wzCDM):
"""Test :class:`astropy.cosmology.Flatw0wzCDM`."""
def setup_class(self):
"""Setup for testing."""
super().setup_class(self)
self.cls = Flatw0wzCDM
def test_repr(self, cosmo_cls, cosmo):
"""Test method ``.__repr__()``."""
super().test_repr(cosmo_cls, cosmo)
assert repr(cosmo) == (
"Flatw0wzCDM(name='ABCMeta', H0=<Quantity 70. km / (Mpc s)>, Om0=0.27, "
"Tcmb0=<Quantity 3. K>, Neff=3.04, m_nu=<Quantity [0., 0., 0.] eV>, "
"Ob0=0.03, w0=-1.0, wz=0.5)"
)
# ---------------------------------------------------------------
@pytest.mark.parametrize("z", valid_zs)
def test_Otot(self, cosmo, z):
"""Test :meth:`astropy.cosmology.Flatw0wzCDM.Otot`.
This is tested in the base class, but we need to override it here because
this class is quite unstable.
"""
super().test_Otot(cosmo, z)
def test_Otot_overflow(self, cosmo):
"""Test :meth:`astropy.cosmology.Flatw0wzCDM.Otot` for NOT overflowing."""
cosmo.Otot(1e5)
# ---------------------------------------------------------------
@pytest.mark.skipif(not HAS_SCIPY, reason="scipy is not installed")
@pytest.mark.parametrize(
("args", "kwargs", "expected"),
[
( # no relativistic species
(75.0, 0.3),
{},
[3004.55645039, 4694.15295565, 5760.90038238, 6504.07869144] * u.Mpc,
),
( # massless neutrinos
(75.0, 0.25),
{"Tcmb0": 3.0, "Neff": 3, "m_nu": 0 * u.eV},
[3086.14574034, 4885.09170925, 6035.4563298, 6840.89215656] * u.Mpc,
),
( # massive neutrinos
(75.0, 0.25),
{"Tcmb0": 3.0, "Neff": 4, "m_nu": 5 * u.eV},
[2510.44035219, 3683.87910326, 4389.97760294, 4873.33577288] * u.Mpc,
),
],
)
def test_comoving_distance_example(self, cosmo_cls, args, kwargs, expected):
"""Test :meth:`astropy.cosmology.LambdaCDM.comoving_distance`.
These do not come from external codes -- they are just internal checks to make
sure nothing changes if we muck with the distance calculators.
"""
super().test_comoving_distance_example(
cosmo_cls, args, {**COMOVING_DISTANCE_EXAMPLE_KWARGS, **kwargs}, expected
)
@pytest.mark.skipif(not HAS_SCIPY, reason="scipy is not installed")
def test_comoving_distance_mathematica(self, cosmo_cls):
"""Test with Mathematica example.
This test should be updated as the code changes.
::
In[1]:= {Om0, w0, wz, H0, c}={0.3,-0.9, 0.2, 70, 299792.458};
c/H0 NIntegrate[1/Sqrt[Om0*(1+z)^3+(1-Om0)(1+z)^(3(1+w0-wz)) Exp[3 *wz*z]],{z, 0, 0.5}]
Out[1]= 1849.75
"""
assert u.allclose(
cosmo_cls(H0=70, Om0=0.3, w0=-0.9, wz=0.2).comoving_distance(0.5),
1849.75 * u.Mpc,
rtol=1e-4,
)
##############################################################################
# Miscellaneous
# TODO: these should be better integrated into the new test framework
@pytest.mark.skipif(not HAS_SCIPY, reason="test requires scipy")
def test_de_densityscale():
cosmo = w0wzCDM(H0=70, Om0=0.3, Ode0=0.50, w0=-1, wz=0.5)
z = np.array([0.1, 0.2, 0.5, 1.5, 2.5])
assert u.allclose(
cosmo.de_density_scale(z),
[1.00705953, 1.02687239, 1.15234885, 2.40022841, 6.49384982],
rtol=1e-4,
)
assert u.allclose(cosmo.de_density_scale(3), cosmo.de_density_scale(3.0), rtol=1e-7)
assert u.allclose(
cosmo.de_density_scale([1, 2, 3]),
cosmo.de_density_scale([1.0, 2.0, 3.0]),
rtol=1e-7,
)
# Flat tests
cosmo = w0wzCDM(H0=70, Om0=0.3, Ode0=0.7, w0=-1, wz=0.5)
flatcosmo = Flatw0wzCDM(H0=70, Om0=0.3, w0=-1, wz=0.5)
assert u.allclose(
cosmo.de_density_scale(z), flatcosmo.de_density_scale(z), rtol=1e-4
)
|
