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test_obj_Collection_child_parent.py
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test_obj_Collection_child_parent.py
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import numpy as np
import magpylib as magpy
from magpylib._src.exceptions import MagpylibBadUserInput
def test_parent_setter():
""" setting and removing a parent"""
child_labels = lambda x: [c.style.label for c in x]
# default parent is None
x1 = magpy.Sensor(style_label='x1')
assert x1.parent is None
# init collection gives parent
c1 = magpy.Collection(x1, style_label='c1')
assert x1.parent.style.label == 'c1'
assert child_labels(c1) == ['x1']
# remove parent with setter
x1.parent=None
assert x1.parent is None
assert child_labels(c1) == []
# set parent
x1.parent = c1
assert x1.parent.style.label == 'c1'
assert child_labels(c1) == ['x1']
# set another parent
c2 = magpy.Collection(style_label='c2')
x1.parent = c2
assert x1.parent.style.label == 'c2'
assert child_labels(c1) == []
assert child_labels(c2) == ['x1']
def test_children_setter():
""" setting new children and removing old parents"""
x1 = magpy.Sensor()
x2 = magpy.Sensor()
x3 = magpy.Sensor()
x4 = magpy.Sensor()
c = magpy.Collection(x1, x2)
c.children = [x3, x4]
# remove old parents
assert x1.parent is None
assert x2.parent is None
# new children
assert c[0] == x3
assert c[1] == x4
def test_setter_parent_override():
""" all setter should override parents"""
x1 = magpy.Sensor()
s1 = magpy.magnet.Cuboid()
c1 = magpy.Collection()
coll = magpy.Collection(x1, s1, c1)
coll2 = magpy.Collection()
coll2.children = coll.children
assert coll2.children == [x1, s1, c1]
coll3 = magpy.Collection()
coll3.sensors = [x1]
coll3.sources = [s1]
coll3.collections = [c1]
assert coll3.children == [x1, s1, c1]
def test_sensors_setter():
""" setting new sensors and removing old parents"""
x1 = magpy.Sensor()
x2 = magpy.Sensor()
x3 = magpy.Sensor()
x4 = magpy.Sensor()
s1 = magpy.magnet.CylinderSegment()
c = magpy.Collection(x1, x2, s1)
c.sensors = [x3, x4]
# remove old parents
assert x1.parent is None
assert x2.parent is None
# keep non-sensors
assert s1.parent == c
# new sensors
assert c[0] == s1
assert c.sensors[0] == x3
assert c.sensors[1] == x4
def test_sources_setter():
""" setting new sources and removing old parents"""
s1 = magpy.magnet.Cylinder()
s2 = magpy.magnet.Cylinder()
s3 = magpy.magnet.Cylinder()
s4 = magpy.magnet.Cylinder()
x1 = magpy.Sensor()
c = magpy.Collection(x1, s1, s2)
c.sources = [s3, s4]
# old parents
assert s1.parent is None
assert s2.parent is None
# keep non-sources
assert x1.parent == c
# new children
assert c[0] == x1
assert c.sources[0] == s3
assert c[2] == s4
def test_collections_setter():
""" setting new sources and removing old parents"""
c1 = magpy.Collection()
c2 = magpy.Collection()
c3 = magpy.Collection()
c4 = magpy.Collection()
x1 = magpy.Sensor()
c = magpy.Collection(c1, x1, c2)
c.collections = [c3, c4]
# old parents
assert c1.parent is None
assert c2.parent is None
# keep non-collections
assert x1.parent == c
# new children
assert c[0] == x1
assert c.collections[0] == c3
assert c[2] == c4
def test_collection_inputs():
""" test basic collection inputs"""
s1 = magpy.magnet.Cuboid(style_label='s1')
s2 = magpy.magnet.Cuboid(style_label='s2')
s3 = magpy.magnet.Cuboid(style_label='s3')
x1 = magpy.Sensor(style_label='x1')
x2 = magpy.Sensor(style_label='x2')
c1 = magpy.Collection(x2, style_label='c1')
c2 = magpy.Collection(c1, x1, s1, s2, s3)
assert [c.style.label for c in c2.children] == ['c1', 'x1', 's1', 's2', 's3']
assert [c.style.label for c in c2.sensors] == ['x1']
assert [c.style.label for c in c2.sources] == ['s1', 's2', 's3']
assert [c.style.label for c in c2.collections] == ['c1']
def test_collection_parent_child_relation():
""" test if parent-child relations are properly set with collections"""
s1 = magpy.magnet.Cuboid()
s2 = magpy.magnet.Cuboid()
s3 = magpy.magnet.Cuboid()
x1 = magpy.Sensor()
x2 = magpy.Sensor()
c1 = magpy.Collection(x2)
c2 = magpy.Collection(c1, x1, s1, s2, s3)
assert x1.parent == c2
assert s3.parent == c2
assert x2.parent == c1
assert c1.parent == c2
assert c2.parent is None
def test_collections_add():
""" test collection construction"""
child_labels = lambda x: [c.style.label for c in x]
x1 = magpy.Sensor(style_label='x1')
x2 = magpy.Sensor(style_label='x2')
x3 = magpy.Sensor(style_label='x3')
x6 = magpy.Sensor(style_label='x6')
x7 = magpy.Sensor(style_label='x7')
# simple add
c2 = magpy.Collection(x1, style_label='c2')
c2.add(x2, x3)
assert child_labels(c2) == ['x1', 'x2', 'x3']
# adding another collection
c3 = magpy.Collection(x6, style_label='c3')
c2.add(c3)
assert child_labels(c2) == ['x1', 'x2', 'x3', 'c3']
assert child_labels(c3) == ['x6']
# adding to child collection should not change its parent collection
c3.add(x7)
assert child_labels(c2) == ['x1', 'x2', 'x3', 'c3']
assert child_labels(c3) == ['x6', 'x7']
# add with parent override
assert x7.parent == c3
c4 = magpy.Collection(style_label='c4')
c4.add(x7, override_parent=True)
assert child_labels(c3) == ['x6']
assert child_labels(c4) == ['x7']
assert x7.parent == c4
def test_collection_plus():
"""
testing collection adding and the += functionality
"""
child_labels = lambda x: [c.style.label for c in x]
s1 = magpy.magnet.Cuboid(style_label='s1')
s2 = magpy.magnet.Cuboid(style_label='s2')
x1 = magpy.Sensor(style_label='x1')
x2 = magpy.Sensor(style_label='x2')
x3 = magpy.Sensor(style_label='x3')
c1 = magpy.Collection(s1, style_label='c1')
# practical simple +
c2 = c1 + s2
assert child_labels(c2) == ['c1', 's2']
# useless triple addition consistency
c3 = x1 + x2 + x3
assert c3[0][0].style.label == 'x1'
assert c3[0][1].style.label == 'x2'
assert c3[1].style.label == 'x3'
# useless += consistency
s3 = magpy.magnet.Cuboid(style_label='s3')
c2 += s3
assert [c.style.label for c in c2[0]] == ['c1', 's2']
assert c2[1] == s3
def test_collection_remove():
""" removing from collections"""
child_labels = lambda x: [c.style.label for c in x]
source_labels = lambda x: [c.style.label for c in x.sources]
sensor_labels = lambda x: [c.style.label for c in x.sensors]
x1 = magpy.Sensor(style_label='x1')
x2 = magpy.Sensor(style_label='x2')
x3 = magpy.Sensor(style_label='x3')
x4 = magpy.Sensor(style_label='x4')
x5 = magpy.Sensor(style_label='x5')
s1 = magpy.misc.Dipole(style_label='s1')
s2 = magpy.misc.Dipole(style_label='s2')
s3 = magpy.misc.Dipole(style_label='s3')
q1 = magpy.misc.CustomSource(style_label='q1')
c1 = magpy.Collection(x1, x2, x3, x4, x5, style_label='c1')
c2 = magpy.Collection(s1, s2, s3, style_label='c2')
c3 = magpy.Collection(q1, c1, c2, style_label='c3')
assert child_labels(c1) == ['x1', 'x2', 'x3', 'x4', 'x5']
assert child_labels(c2) == ['s1', 's2', 's3']
assert child_labels(c3) == ['q1', 'c1', 'c2']
# remove item from collection
c1.remove(x5)
assert child_labels(c1) == ['x1', 'x2', 'x3', 'x4']
assert [c.style.label for c in c1.sensors] == ['x1', 'x2', 'x3', 'x4']
# remove 2 items from collection
c1.remove(x3, x4)
assert child_labels(c1) == ['x1', 'x2']
assert sensor_labels(c1) == ['x1', 'x2']
# remove item from child collection
c3.remove(s3)
assert child_labels(c3) == ['q1', 'c1', 'c2']
assert child_labels(c2) == ['s1', 's2']
assert source_labels(c2) == ['s1', 's2']
# remove child collection
c3.remove(c2)
assert child_labels(c3) == ['q1', 'c1']
assert child_labels(c2) == ['s1', 's2']
# attempt remove non-existant child
c3.remove(s1, errors='ignore')
assert child_labels(c3) == ['q1', 'c1']
assert child_labels(c1) == ['x1', 'x2']
# attempt remove child in lower level with recursion=False
c3.remove(x1, errors='ignore', recursive=False)
assert child_labels(c3) == ['q1', 'c1']
assert child_labels(c1) == ['x1', 'x2']
# attempt remove of non-existing child
with np.testing.assert_raises(MagpylibBadUserInput):
c3.remove(x1, errors='raise', recursive=False)
def test_collection_nested_getBH():
""" test if getBH functionality is self-consistent with nesting"""
s1 = magpy.current.Loop(1, 1)
s2 = magpy.current.Loop(1, 1)
s3 = magpy.current.Loop(1, 1)
s4 = magpy.current.Loop(1, 1)
obs = [(1,2,3), (-2,-3,1), (2,2,-4), (4,2,-4)]
coll = s1 + s2 + s3 + s4 # nasty nesting
B1 = s1.getB(obs)
B4 = coll.getB(obs)
np.testing.assert_allclose(4*B1, B4)
H1 = s1.getH(obs)
H4 = coll.getH(obs)
np.testing.assert_allclose(4*H1, H4)