def test_fast_mean_with_empty_list_returns_zero(self):
# Arrange
values = np.asarray([], dtype=np.float64)
# Act
result = fast_mean(values)
# Assert
assert result == 0
def test_fast_mean_with_values(self):
# Arrange
values = np.asarray([0.0, 1.1, 2.2, 3.3, 4.4, 5.5], dtype=np.float64)
# Act
result = fast_mean(values)
# Assert
assert result == 2.75
assert np.mean(values) == 2.75
def test_fast_mean_iterated_with_values(self):
# Arrange
values1 = np.asarray([0.0, 1.1, 2.2], dtype=np.float64)
values2 = np.asarray([0.0, 1.1, 2.2, 3.3, 4.4], dtype=np.float64)
# Act
result1 = fast_mean_iterated(values1, 0.0, fast_mean(values1), 5)
result2 = fast_mean_iterated(values2, 5.5, np.mean(values2), 5)
# Assert
assert result1 == np.mean([0.0, 1.1, 2.2])
assert result2 == 3.3000000000000003
def test_std_dev_with_mean(self):
# Arrange
values = np.asarray([0.0, 1.1, 2.2, 3.3, 4.4, 8.1, 9.9, -3.0],
dtype=np.float64)
mean = fast_mean(values)
# Act
result1 = fast_std(values)
result2 = fast_std_with_mean(values, mean)
# Assert
assert result1 == np.std(values)
assert result2 == np.std(values)
assert result1 == 3.943665807342199
assert result2 == 3.943665807342199