from ctypes import Structure, c_int16

def test_struct_format():
    class Struct(Structure):
        _fields_ = [('a', c_int16)]

    Struct3 = 3 * Struct

    c_array = (2 * Struct3)(
        Struct3(Struct(a=1), Struct(a=2), Struct(a=3)),
        Struct3(Struct(a=4), Struct(a=5), Struct(a=6))
    )

    mv = memoryview(c_array)
    assert mv.format == 'T{<h:a:}', '%s != "T{<h:a:}"' % mv.format

test_struct_format()