old_contents: "Test for recalcitrant and obtuse graphs to describe"
  from wordgraph.points import Point
  import wordgraph
  
  import random
  
  from utilities import EPOCH_START, time_values
  
  def test_time_goes_backwards():
      "A valid time series where time changes linearly backwards"
      values = [1.0] * 10
      times = (EPOCH_START-i for i in range(10))
      datapoints = [Point(x=t, y=v) for (v, t) in zip(values, time)]
      features = wordgraph.describe(datapoints)
      assert features is None
  
  def test_random_data():
      "A time series of 50 data points where every value is random"
      rng = random.Random(0)
      values = [rng.random() for i in range(50)]
      datapoints = time_values(values)
      features = wordgraph.describe(datapoints)
      assert features is None
  
new_contents: "Test for recalcitrant and obtuse graphs to describe"
  from wordgraph.points import Point
  import wordgraph
  
  import random
  import pytest
  
  from utilities import EPOCH_START, time_values
  
  def test_time_goes_backwards():
      "A valid time series where time changes linearly backwards"
      values = [1.0] * 10
      times = (EPOCH_START-i for i in range(10))
      datapoints = [Point(x=t, y=v) for (v, t) in zip(values, time)]
      features = wordgraph.describe(datapoints)
      assert features is None
  
  def test_random_data():
      "A time series of 50 data points where every value is random"
      rng = random.Random(0)
      values = [rng.random() for i in range(50)]
      datapoints = time_values(values)
      features = wordgraph.describe(datapoints)
      assert features is None
  
  def test_too_few_points():
      """A time series with too few data points to be analysed.
  
      Expected to raise an exception.
      """
      with pytest.raises(ValueError):
          features = wordgraph.describe([Point(x=0, y=0)])
  
  def test_nonuniform_time_periods():
      """A time series where time periods are wildly different.
  
      Expected to raise an exception.
      """
      times = [1, 3, 4, 6, 7, 9, 10]
      datapoints = [Point(x=t, y=1.0) for t in times]
      with pytest.raises(ValueError):
          features = wordgraph.describe(datapoints)
  
subject: Test expected failures of the anlayzer