def test_material_init():
"""Test the initialization of EnergyMaterial objects and basic properties."""
concrete = EnergyMaterial('Concrete', 0.2, 0.5, 800, 1200, 'MediumSmooth',
0.95, 0.75, 0.8)
str(concrete) # test the string representation of the material
concrete_dup = concrete.duplicate()
assert concrete.identifier == concrete_dup.identifier == 'Concrete'
assert concrete.thickness == concrete_dup.thickness == 0.2
assert concrete.conductivity == concrete_dup.conductivity == 0.5
assert concrete.density == concrete_dup.density == 800
assert concrete.specific_heat == concrete_dup.specific_heat == 1200
assert concrete.roughness == concrete_dup.roughness == 'MediumSmooth'
assert concrete.thermal_absorptance == concrete_dup.thermal_absorptance == 0.95
assert concrete.solar_absorptance == concrete_dup.solar_absorptance == 0.75
assert concrete.visible_absorptance == concrete_dup.visible_absorptance == 0.8
assert concrete.resistivity == 1 / 0.5
assert concrete.u_value == pytest.approx(2.5, rel=1e-2)
assert concrete.r_value == pytest.approx(0.4, rel=1e-2)
assert concrete.mass_area_density == pytest.approx(160, rel=1e-2)
assert concrete.area_heat_capacity == pytest.approx(192000, rel=1e-2)
concrete.r_value = 0.5
assert concrete.conductivity != concrete_dup.conductivity
assert concrete.r_value == 0.5
assert concrete.conductivity == pytest.approx(0.4, rel=1e-2)
def test_material_equivalency():
"""Test the equality of a material to another EnergyMaterial."""
concrete_1 = EnergyMaterial('Concrete [HW]', 0.2, 0.5, 800, 1200)
concrete_2 = concrete_1.duplicate()
insulation = EnergyMaterial('Insulation', 0.05, 0.049, 265, 836)
assert concrete_1 == concrete_2
assert concrete_1 != insulation
collection = [concrete_1, concrete_2, insulation]
assert len(set(collection)) == 2
concrete_2.density = 600
assert concrete_1 != concrete_2
assert len(set(collection)) == 3
