def test_detect_increasing_trend(self):
x = np.arange(0, 100)
y = np.arange(0, 100)
noise = np.random.normal(size=100)
signal = y + noise
mk = MannKendall()
trend, trend_type, p, z = mk.detect_trend(x, signal)
assert trend
assert trend_type == 'increasing'
def test_detect_no_trend(self):
x = np.zeros((100, ))
y = np.zeros((100, ))
noise = np.random.normal(size=100)
signal = y + noise
mk = MannKendall()
trend, trend_type, p, z = mk.detect_trend(x, signal)
assert not trend
assert trend_type == 'no trend'
def test_detect_decreasing_trend(self):
x = np.linspace(100, 0, num=100)
y = np.linspace(100, 0, num=100)
noise = np.random.normal(size=100)
signal = y + noise
mk = MannKendall()
trend, trend_type, p, z = mk.detect_trend(x, signal)
assert trend
assert trend_type == 'decreasing'