def test_2():
assert kelvins(-50) == 223.15
def test_8():
assert kelvins(1000) == 1273.15
def test_1():
assert kelvins(-273.15) == 0
def test_7():
assert kelvins(100) == 373.15
def test_6():
assert kelvins(37) == 310.15
def test_5():
assert kelvins(21) == 294.15
def test_4():
assert kelvins(0) == 273.15
def test_3():
assert kelvins(-10) == 263.15