def test_density(self):
"""Test seawater's mass density.
"""
seawater = pyseawater.seawater(density=1.04)
message = "Density is not equal to the expected value of 1.04."
self.assertEqual(seawater.density, 1.04, message)
def setUpClass(cls):
"""Reference hydrogen mass fraction
"""
seawater = pyseawater.seawater(salinity=35e-3).fractions()
hydrogen = {element.symbol: element for element in seawater}["H"]
cls.fraction = seawater[hydrogen]
def test_less_salt(self):
"""Test hydrogen's mass fraction for less salt.
"""
seawater = pyseawater.seawater(salinity=34e-3).fractions()
hydrogen = {element.symbol: element for element in seawater}["H"]
message = "Hydrogen's mass fraction is not larger for less salt."
self.assertGreater(seawater[hydrogen], self.fraction, message)
def test_more_salt(self):
"""Test hydrogen's mass fraction for more salt.
"""
seawater = pyseawater.seawater(salinity=36e-3).fractions()
hydrogen = {element.symbol: element for element in seawater}["H"]
message = "Hydrogen's mass fraction is not smaller for more salt."
self.assertLess(seawater[hydrogen], self.fraction, message)
def test_ordering(self):
"""Test mass fractions' odering.
"""
seawater = pyseawater.seawater(salinity=35e-3).fractions()
fractions = sorted(
seawater.items(), key=lambda entry: entry[1], reverse=True)
symbols = [e.symbol for e, f in fractions]
expected = ["O", "H", "Cl", "Na", "Mg", "S", "Ca", "K"]
message = (
"The sequence of the chemical elements of seawater, sorted by "
"mass fraction, is not equal to the expectation."
)
self.assertListEqual(symbols, expected, message)
def setUpClass(cls):
seawater = pyseawater.seawater(salinity=35e-3, density=1.)
cls.elements = {e.symbol: e for e in seawater.fractions().keys()}