def METHOD_NAME():
    # Get data without streamer and with streamer.
    # These two must be the same.
    X = buildLargeSystem(False)   # without streamer
    Y = buildLargeSystem(True)    # with streamer.
    # X has no time.
    assert len(X) == len(Y.dtype.names)-1, (len(X), Y.dtype)
    # same column names.
    xNames = list(X.keys())
    yNames = list(Y.dtype.names)
    assert set(yNames) - set(xNames)  == set(['time']), (yNames, xNames)
    # Test for equality in some tables.
    for i in range(1, 10):
        a, b = Y[xNames[i]], X[xNames[i]]
        assert a.shape == b.shape, (a.shape, b.shape)
        assert (a == b).all(), (a-b)