def test_known_common_stable_isotopes_cases():
"""Test that known_isotopes, common_isotopes, and stable_isotopes
return certain isotopes that fall into these categories."""
assert "H-1" in known_isotopes("H")
assert "D" in known_isotopes("H")
assert "T" in known_isotopes("H")
assert "Be-8" in known_isotopes("Be")
assert "Og-294" in known_isotopes(118)
assert "H-1" in common_isotopes("H")
assert "H-4" not in common_isotopes(1)
assert "H-1" in stable_isotopes("H")
assert "D" in stable_isotopes("H")
assert "T" not in stable_isotopes("H")
assert "Fe-56" in common_isotopes("Fe", most_common_only=True)
assert "He-4" in common_isotopes("He", most_common_only=True)
def test_known_common_stable_isotopes_len():
"""Test that `known_isotopes`, `common_isotopes`, and
`stable_isotopes` each return a `list` of the expected length.
The number of common isotopes may change if isotopic composition
data has any significant changes.
The number of stable isotopes may decrease slightly if some isotopes
are discovered to be unstable but with extremely long half-lives.
The number of known isotopes will increase as new isotopes are
discovered, so a buffer is included in the test.
"""
assert len(common_isotopes()) == 288, (
"The length of the list returned by common_isotopes() is "
f"{len(common_isotopes())}, which is not the expected value.")
assert len(stable_isotopes()) == 254, (
"The length of the list returned by stable_isotopes() is "
f"{len(stable_isotopes())}, which is not the expected value.")
assert 3352 <= len(known_isotopes()) <= 3400, (
"The length of the list returned by known_isotopes() is "
f"{len(known_isotopes())}, which is not within the expected range.")
def test_particle_half_life_string():
"""
Find the first isotope where the half-life is stored as a string
(because the uncertainties are too great), and tests that requesting
the half-life of that isotope causes a `MissingParticleDataWarning`
whilst returning a string.
"""
for isotope in known_isotopes():
half_life = _isotopes[isotope].get("half-life", None)
if isinstance(half_life, str):
break
with pytest.warns(MissingParticleDataWarning):
assert isinstance(Particle(isotope).half_life, str)
def test_known_common_stable_isotopes():
"""Test that `known_isotopes`, `common_isotopes`, and
`stable_isotopes` return the correct values for hydrogen."""
known_should_be = ["H-1", "D", "T", "H-4", "H-5", "H-6", "H-7"]
common_should_be = ["H-1", "D"]
stable_should_be = ["He-3", "He-4"]
assert known_isotopes("H") == known_should_be, (
f"known_isotopes('H') should return {known_should_be}, but is "
f"instead returning {known_isotopes('H')}")
assert common_isotopes("H") == common_should_be, (
f"common_isotopes('H') should return {common_should_be}, but is "
f"instead returning {common_isotopes('H')}")
assert stable_isotopes("He") == stable_should_be, (
f"stable_isotopes('He') should return {stable_should_be}, but is "
f"instead returning {stable_isotopes('He')}")