def METHOD_NAME(self):
    """sbpy#113
    Using Haberreiter et al. 2017 solar spectrum: -26.77.
    NaNs in Kurucz file should not affect this calculation.
    """
    sun = Sun.from_builtin("Kurucz1993")
    V = bandpass("johnson v")
    fluxd = sun.observe(V, unit=u.ABmag)
    assert np.isclose(fluxd.value, -26.77, atol=0.005)