test failing comparing float values

[tngTUDOR]

Current

============================
FAILED tests/unit/test_unit.py::test_energy - AssertionError: Expected u1.conversion_factor(u2) to be 3.6, but got 3.5999999999999996
assert 3.5999999999999996 == 3.6
 +  where 3.5999999999999996 = conversion_factor('MJ')
 +    where conversion_factor = 'kilowatt hour'.conversion_factor
======================== 1 failed, 552 passed in 4.89s =========================

Expected

the comparison in the test is sensitive to float values and passes.