def test_acoustic_material():
water = fds.AcousticMaterial(1500, 1000)
water.bulk_viscosity = 1e-3
water.shear_viscosity = 1e-3
assert np.isclose(water.absorption_coef, 7e-3 / 3)
water.absorption_coef = 3e-3
assert np.isclose(water.absorption_coef, 3e-3)
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