text: import unittest
  
  import numpy as np
  
  from clovars.bio import Cell, Colony, Treatment
  from clovars.scientific import ConstantCellSignal
  from tests import SKIP_TESTS
  
  
  class TestColony(unittest.TestCase):
      """Class representing unit-tests for clovars.bio.colony.Colony class."""
      default_delta = 100
  
      def setUp(self) -> None:
          """Sets up the test case subject (a Colony instance)."""
          self.colony = Colony()
  
      def test_colony_has_default_treatment_regimen_attribute(self) -> None:
          """Tests whether a Colony has a "default_treatment_regimen" attribute (a dictionary)."""
          self.assertTrue(hasattr(self.colony, 'default_treatment_regimen'))
          self.assertIsInstance(self.colony.default_treatment_regimen, dict)
          for key, value in self.colony.default_treatment_regimen.items():
              self.assertIsInstance(key, int)
              self.assertIsInstance(value, Treatment)
  
      def test_colony_has_cells_attribute(self) -> None:
          """Tests whether a Colony has a "cells" attribute (a list)."""
          self.assertTrue(hasattr(self.colony, 'cells'))
          self.assertIsInstance(self.colony.cells, list)
  
      def test_cells_attribute_is_empty_list_when_cells_argument_is_none(self) -> None:
          """Tests whether the "cells" attribute is an empty list when a Colony is initialized with cells=None."""
          self.assertEqual(Colony(cells=None).cells, [])
  
      def test_colony_has_seconds_since_birth_attribute(self) -> None:
          """Tests whether a Colony has a "seconds_since_birth" attribute (an int)."""
          self.assertTrue(hasattr(self.colony, 'seconds_since_birth'))
          self.assertIsInstance(self.colony.seconds_since_birth, int)
  
      def test_colony_has_treatment_regimen_attribute(self) -> None:
          """Tests whether a Colony has a "treatment_regimen" attribute (a dictionary)."""
          self.assertTrue(hasattr(self.colony, 'treatment_regimen'))
          self.assertIsInstance(self.colony.treatment_regimen, dict)
  
      def test_treatment_regimen_attribute_is_the_default_when_treatment_regimen_argument_is_none(self) -> None:
          """
          Tests whether the "treatment_regimen" attribute is set to the default Treatment regimen
          when a Colony is initialized with treatment_regimen=None.
          """
          self.assertEqual(Colony(treatment_regimen=None).treatment_regimen, Colony.default_treatment_regimen)
  
      def test_colony_equality_compares_the_cell_lists(self) -> None:
          """Tests whether comparing two Colonies for equality compares each Colony's Cells list."""
          other_colony = Colony()
          self.assertEqual(self.colony, other_colony)
          other_colony.cells = [Cell()]
          self.assertNotEqual(self.colony, other_colony)
  
      def test_colony_length_returns_number_of_cells_in_the_colony(self) -> None:
          """Tests whether the Colony length corresponds to the number of Cells in it."""
          self.assertEqual(len(self.colony), 0)
          self.colony.cells = [Cell(), Cell(), Cell()]
          self.assertEqual(len(self.colony), 3)
  
      def test_colony_iteration_yields_cells_from_colony(self) -> None:
          """Tests whether iterating over the Colony yields Cells from the Cells list."""
          cells = [Cell(), Cell(), Cell()]
          self.colony.cells = cells
          for cell, cell_from_colony in zip(cells, self.colony):
              self.assertIs(cell, cell_from_colony)
  
      def test_colony_getitem_returns_the_cell_at_the_index(self) -> None:
          """Tests whether calling the Colony's "__getitem__" special method returns the Cell at the i-th index."""
          with self.assertRaises(TypeError):
              self.colony['abc']  # noqa
          with self.assertRaises(IndexError):
              self.colony[0]  # noqa
          self.colony.cells = [Cell(), Cell(), Cell()]
          self.assertIs(self.colony[0], self.colony.cells[0])
          self.assertIs(self.colony[1], self.colony.cells[1])
          self.assertIs(self.colony[2], self.colony.cells[2])
          with self.assertRaises(IndexError):
              self.colony[3]  # noqa
  
      def test_colony_boolean_returns_whether_there_are_cells_in_the_colony(self) -> None:
          """Tests whether the Colony is considered to be True if there are Cells in it, and False otherwise."""
          self.assertFalse(self.colony)
          self.colony.cells = [Cell()]
          self.assertTrue(self.colony)
  
      def test_name_property_returns_name_from_the_first_cell(self) -> None:
          """Tests whether the Colony's "name" property returns the first Cell's "colony_name"."""
          self.colony.cells = [Cell(name='1.2.1')]
          self.assertEqual(self.colony.name, '1')
          self.colony.cells = [Cell(name='19.1.1')]
          self.assertEqual(self.colony.name, '19')
          self.colony.cells.append(Cell(name='1.2.1'))
          self.assertEqual(self.colony.name, '19')
  
      def test_name_property_returns_none_if_colony_is_empty(self) -> None:
          """Tests whether the "name" property returns None if the Colony has no Cells in it."""
          self.assertIsNone(Colony().name)
  
      def test_center_property_returns_the_colony_average_xy_coordinate(self) -> None:
          """Tests whether the "center" property returns the Colony's  "average" XY coordinate, considering its Cells."""
          self.colony.cells.append(Cell(x=0, y=10))
          self.assertEqual(self.colony.center, (0, 10))
          self.colony.cells.append(Cell(x=10, y=32))
          self.assertEqual(self.colony.center, (5, 21))
          self.colony.cells.append(Cell(x=50, y=21))
          self.assertEqual(self.colony.center, (20, 21))
  
      def test_center_property_returns_none_if_colony_is_empty(self) -> None:
          """Tests whether the "center" property returns None if the Colony has no Cells in it."""
          self.assertIsNone(Colony().center)
  
      def test_is_dead_returns_true_if_colony_is_empty(self) -> None:
          """Tests whether the "is_dead" method returns False if the Colony has no Cells in it."""
          self.assertTrue(Colony(cells=[]).is_dead())
  
      def test_is_dead_returns_true_when_all_cells_in_it_are_dead(self) -> None:
          """Tests whether the "is_dead" method returns True only if all Cells in the Colony are dead."""
          for _ in range(5):
              cell = Cell()
              self.colony.cells.append(cell)
              self.assertFalse(self.colony.is_dead())
              cell.die()
              self.assertTrue(self.colony.is_dead())
  
      def test_signal_mean_method_returns_the_mean_across_all_cell_signals(self) -> None:
          """Tests whether the Colony "signal_mean" property returns the Signal mean across all Cells in the Colony."""
          signal_values = [1.0, 0.5, 0.0, -0.5, -1.0]
          self.colony.cells = [
              Cell(signal=ConstantCellSignal(initial_value=initial_value))
              for initial_value in signal_values
          ]
          self.assertEqual(self.colony.signal_mean(), np.mean(signal_values))
  
      def test_signal_std_method_returns_the_mean_across_all_cell_signals(self) -> None:
          """
          Tests whether the Colony "signal_std" property returns the Signal standard deviation
          across all Cells in the Colony.
          """
          signal_values = [1.0, 0.5, 0.0, -0.5, -1.0]
          self.colony.cells = [
              Cell(signal=ConstantCellSignal(initial_value=initial_value))
              for initial_value in signal_values
          ]
          self.assertEqual(self.colony.signal_std(), np.std(signal_values))
  
      @unittest.skipIf(SKIP_TESTS is True, "SKIP TESTS is set to True")
      def test_pass_time_method_(self) -> None:
          """Docstring."""
          self.fail('Write the test!')
  
  
  if __name__ == '__main__':
      unittest.main()
  