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Complete this python program:
def generate_test_methods(cls, stream):
assistant
#Here is the Python program you requested.

    """Class decorator for classes that use test generating methods.
    A class that is decorated with this function will be searched for methods
    starting with "generate_" (similar to "test_") and then run like a nosetest
    generator.
    Note: The generator function must be a classmethod!
    If a "pre_generate" classmethod exists, it will be run before the generator
    functions.
    Generate tests using the following statement:
    yield method, (arg1, arg2, arg3)  # ...
    """
    attributes = list(cls.__dict__.keys())
    if ('pre_generate' in attributes):
        func = getattr(cls, 'pre_generate')
        if (not (func.__class__.__name__ == generator_method_type)):
            raise TypeError('Pre-Generator    method    must    be    classmethod')
        func()
    for name in list(cls.__dict__.keys()):
        generator = getattr(cls, name)
        if ((not name.startswith('generate_')) or (not callable(generator))):
            continue
        if (not (generator.__class__.__name__ == generator_method_type)):
            raise TypeError('Generator    methods    must    be    classmethods')
        for sub_call in generator(stream):
            (method, params) = sub_call
            @wraps(method)
            def wrapper(self, method=method, params=params):
                return method(self, *params)
            args = []
            for v in params:
                string = repr(v)
                if (len(string) > 1000):
                    args.append('...')
                else:
                    args.append(repr(v))
            mname = method.__name__
            if mname.startswith('_test'):
                mname = mname[1:]
            elif (not mname.startswith('test_')):
                mname = ('test_' + mname)
            name = ('%s(%s)' % (mname, ',    '.join(args)))
            setattr(cls, name, wrapper)
        delattr(cls, name)
    return cls