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import pytest
from pint import UnitRegistry
from pint.testsuite import QuantityTestCase
class TestGroup:
def _build_empty_reg_root(self):
ureg = UnitRegistry(None)
grp = ureg.get_group("root")
grp.invalidate_members()
return ureg, ureg.get_group("root")
def test_units_programmatically(self):
ureg, root = self._build_empty_reg_root()
d = ureg._groups
assert root._used_groups == set()
assert root._used_by == set()
root.add_units("meter", "second", "meter")
assert root._unit_names == {"meter", "second"}
assert root.members == {"meter", "second"}
assert d.keys() == {"root"}
def test_cyclic(self):
ureg, root = self._build_empty_reg_root()
g2 = ureg.Group("g2")
g3 = ureg.Group("g3")
g2.add_groups("g3")
with pytest.raises(ValueError):
g2.add_groups("root")
with pytest.raises(ValueError):
g3.add_groups("g2")
with pytest.raises(ValueError):
g3.add_groups("root")
def test_groups_programmatically(self):
ureg, root = self._build_empty_reg_root()
d = ureg._groups
g2 = ureg.Group("g2")
assert d.keys() == {"root", "g2"}
assert root._used_groups == {"g2"}
assert root._used_by == set()
assert g2._used_groups == set()
assert g2._used_by == {"root"}
def test_simple(self):
lines = ["@group mygroup", "meter = 3", "second = 2"]
ureg, root = self._build_empty_reg_root()
d = ureg._groups
grp = ureg.Group.from_lines(lines, lambda x: None)
assert d.keys() == {"root", "mygroup"}
assert grp.name == "mygroup"
assert grp._unit_names == {"meter", "second"}
assert grp._used_groups == set()
assert grp._used_by == {root.name}
assert grp.members == frozenset(["meter", "second"])
def test_using1(self):
lines = ["@group mygroup using group1", "meter = 2", "second = 3"]
ureg, root = self._build_empty_reg_root()
ureg.Group("group1")
grp = ureg.Group.from_lines(lines, lambda x: None)
assert grp.name == "mygroup"
assert grp._unit_names == {"meter", "second"}
assert grp._used_groups == {"group1"}
assert grp.members == frozenset(["meter", "second"])
def test_using2(self):
lines = ["@group mygroup using group1,group2", "meter = 2", "second = 3"]
ureg, root = self._build_empty_reg_root()
ureg.Group("group1")
ureg.Group("group2")
grp = ureg.Group.from_lines(lines, lambda x: None)
assert grp.name == "mygroup"
assert grp._unit_names == {"meter", "second"}
assert grp._used_groups == {"group1", "group2"}
assert grp.members == frozenset(["meter", "second"])
def test_spaces(self):
lines = [
"@group mygroup using group1 , group2",
" meter = 2",
" second = 3",
]
ureg, root = self._build_empty_reg_root()
ureg.Group("group1")
ureg.Group("group2")
grp = ureg.Group.from_lines(lines, lambda x: None)
assert grp.name == "mygroup"
assert grp._unit_names == {"meter", "second"}
assert grp._used_groups == {"group1", "group2"}
assert grp.members == frozenset(["meter", "second"])
def test_invalidate_members(self):
lines = ["@group mygroup using group1", "meter = 2 ", "second = 3"]
ureg, root = self._build_empty_reg_root()
ureg.Group("group1")
grp = ureg.Group.from_lines(lines, lambda x: None)
assert root._computed_members is None
assert grp._computed_members is None
assert grp.members == frozenset(["meter", "second"])
assert root._computed_members is None
assert grp._computed_members is not None
assert root.members == frozenset(["meter", "second"])
assert root._computed_members is not None
assert grp._computed_members is not None
grp.invalidate_members()
assert root._computed_members is None
assert grp._computed_members is None
def test_with_defintions(self):
lines = [
"@group imperial",
"kings_leg = 2 * meter",
"kings_head = 52 * inch",
]
defs = []
def define(ud):
defs.append(ud.name)
ureg, root = self._build_empty_reg_root()
ureg.Group.from_lines(lines, define)
assert ["kings_leg", "kings_head"] == defs
def test_members_including(self):
ureg, root = self._build_empty_reg_root()
g1 = ureg.Group("group1")
g1.add_units("second", "inch")
g2 = ureg.Group("group2")
g2.add_units("second", "newton")
g3 = ureg.Group("group3")
g3.add_units("meter", "second")
g3.add_groups("group1", "group2")
assert root.members == frozenset(["meter", "second", "newton", "inch"])
assert g1.members == frozenset(["second", "inch"])
assert g2.members == frozenset(["second", "newton"])
assert g3.members == frozenset(["meter", "second", "newton", "inch"])
def test_get_compatible_units(self):
ureg = UnitRegistry()
g = ureg.get_group("test-imperial")
g.add_units("inch", "yard", "pint")
c = ureg.get_compatible_units("meter", "test-imperial")
assert c == frozenset([ureg.inch, ureg.yard])
# TODO: do not subclass from QuantityTestCase
class TestSystem(QuantityTestCase):
def _build_empty_reg_root(self):
ureg = UnitRegistry(None)
grp = ureg.get_group("root")
grp.invalidate_members()
return ureg, ureg.get_group("root")
def test_implicit_root(self):
lines = ["@system mks", "meter", "kilogram", "second"]
ureg, root = self._build_empty_reg_root()
s = ureg.System.from_lines(lines, lambda x: x)
s._used_groups = {"root"}
def test_simple_using(self):
lines = ["@system mks using g1", "meter", "kilogram", "second"]
ureg, root = self._build_empty_reg_root()
s = ureg.System.from_lines(lines, lambda x: x)
s._used_groups = {"root", "g1"}
def test_members_group(self):
lines = ["@system mk", "meter", "kilogram"]
ureg, root = self._build_empty_reg_root()
root.add_units("second")
s = ureg.System.from_lines(lines, lambda x: x)
assert s.members == frozenset(["second"])
def test_get_compatible_units(self):
sysname = "mysys1"
ureg = UnitRegistry()
g = ureg.get_group("test-imperial")
g.add_units("inch", "yard", "pint")
c = ureg.get_compatible_units("meter", "test-imperial")
assert c == frozenset([ureg.inch, ureg.yard])
lines = ["@system %s using test-imperial" % sysname, "inch"]
ureg.System.from_lines(lines, lambda x: x)
c = ureg.get_compatible_units("meter", sysname)
assert c == frozenset([ureg.inch, ureg.yard])
def test_get_base_units(self):
sysname = "mysys2"
ureg = UnitRegistry()
g = ureg.get_group("test-imperial")
g.add_units("inch", "yard", "pint")
lines = ["@system %s using test-imperial" % sysname, "inch"]
s = ureg.System.from_lines(lines, ureg.get_base_units)
ureg._systems[s.name] = s
# base_factor, destination_units
c = ureg.get_base_units("inch", system=sysname)
assert round(abs(c[0] - 1), 7) == 0
assert c[1] == {"inch": 1}
c = ureg.get_base_units("cm", system=sysname)
assert round(abs(c[0] - 1.0 / 2.54), 7) == 0
assert c[1] == {"inch": 1}
def test_get_base_units_different_exponent(self):
sysname = "mysys3"
ureg = UnitRegistry()
g = ureg.get_group("test-imperial")
g.add_units("inch", "yard", "pint")
ureg.get_compatible_units("meter", "test-imperial")
lines = ["@system %s using test-imperial" % sysname, "pint:meter"]
s = ureg.System.from_lines(lines, ureg.get_base_units)
ureg._systems[s.name] = s
# base_factor, destination_units
c = ureg.get_base_units("inch", system=sysname)
assert round(abs(c[0] - 0.326), 3) == 0
assert c[1] == {"pint": 1.0 / 3}
c = ureg.get_base_units("cm", system=sysname)
assert round(abs(c[0] - 0.1283), 3) == 0
assert c[1] == {"pint": 1.0 / 3}
c = ureg.get_base_units("inch**2", system=sysname)
assert round(abs(c[0] - 0.326**2), 3) == 0
assert c[1] == {"pint": 2.0 / 3}
c = ureg.get_base_units("cm**2", system=sysname)
assert round(abs(c[0] - 0.1283**2), 3) == 0
assert c[1] == {"pint": 2.0 / 3}
def test_get_base_units_relation(self):
sysname = "mysys4"
ureg = UnitRegistry()
g = ureg.get_group("test-imperial")
g.add_units("inch", "yard", "pint")
lines = ["@system %s using test-imperial" % sysname, "mph:meter"]
s = ureg.System.from_lines(lines, ureg.get_base_units)
ureg._systems[s.name] = s
# base_factor, destination_units
c = ureg.get_base_units("inch", system=sysname)
assert round(abs(c[0] - 0.056), 2) == 0
assert c[1] == {"mph": 1, "second": 1}
c = ureg.get_base_units("kph", system=sysname)
assert round(abs(c[0] - 0.6213), 3) == 0
assert c[1] == {"mph": 1}
def test_members_nowarning(self):
ureg = self.ureg
for name in dir(ureg.sys):
dir(getattr(ureg.sys, name))
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