def test_bollinger_bands():
candles = np.array(bollinger_bands_candles)
bb = ta.bollinger_bands(candles)
u, m, l = bb
assert type(bb).__name__ == 'BollingerBands'
assert round(u, 1) == 145.8
assert round(m, 1) == 141.2
assert round(l, 1) == 136.7
seq_bb = ta.bollinger_bands(candles, sequential=True)
assert seq_bb.upperband[-1] == u
assert len(seq_bb.upperband) == len(candles)
assert len(seq_bb.middleband) == len(candles)
assert len(seq_bb.lowerband) == len(candles)
def bb(self):
# Bollinger bands using default parameters and hl2 as source
return ta.bollinger_bands(self.candles, source_type="hl2")