def test_graph_sample_rate():
graph = AudioGraph()
assert graph.sample_rate > 0
graph.sample_rate = 1000
assert graph.sample_rate == 1000
with pytest.raises(Exception):
graph.sample_rate = 0
buf = Buffer(1, 1000)
sine = SineOscillator(10)
process_tree(sine, buf)
assert count_zero_crossings(buf.data[0]) == 10
del graph
def test_graph_cyclic():
graph = AudioGraph()
graph.sample_rate = 1000
line = Line(0, 1, 1)
m1 = line * 1
m2 = line * 2
add = m1 + m2
graph.play(add)
buf = Buffer(1, 1000)
graph.render_to_buffer(buf)
assert np.all(np.abs(buf.data[0] - np.linspace(0, 3, graph.sample_rate)) < 0.00001)
del graph