old_contents: import pandas as pd
  import pytest
  
  from vivarium.framework.population import PopulationView, InitializerComponentSet, PopulationError
  
  
  class DummyPopulationManager:
      def __init__(self):
          self.get_population = lambda _ : pd.DataFrame({'age': [0, 10, 20, 30, 40, 50, 60, 70], 'sex': ['Male', 'Female']*4})
  
  
  def test_create_PopulationView_with_all_columns():
      manager = DummyPopulationManager()
      view = PopulationView(manager, 0)
      assert set(view.columns) == {'age', 'sex'}
  
  
  def test_initializer_set_fail_type():
      component_set = InitializerComponentSet()
  
      with pytest.raises(TypeError):
          component_set.add(lambda: 'test', ['test_column'])
  
      def initializer():
          return 'test'
  
      with pytest.raises(TypeError):
          component_set.add(initializer, ['test_column'])
  
  
  class UnnamedComponent:
  
      def initializer(self):
          return 'test'
  
  
  class Component:
  
      def __init__(self, name):
          self.name = name
  
      def initializer(self):
          return 'test'
  
      def other_initializer(self):
          return 'whoops'
  
  
  def test_initializer_set_fail_attr():
      component_set = InitializerComponentSet()
  
      with pytest.raises(AttributeError):
          component_set.add(UnnamedComponent().initializer, ['test_column'])
  
  
  def test_initializer_set_duplicate_component():
      component_set = InitializerComponentSet()
      component = Component('test')
  
      component_set.add(component.initializer, ['test_column1'])
      with pytest.raises(PopulationError, match='multiple population initializers'):
          component_set.add(component.other_initializer, ['test_column2'])
  
  
  def test_initializer_set_duplicate_columns():
      component_set = InitializerComponentSet()
      component1 = Component('test1')
      component2 = Component('test2')
      columns = ['test_column']
  
      component_set.add(component1.initializer, columns)
      with pytest.raises(PopulationError, match='both registered initializers'):
          component_set.add(component2.initializer, columns)
  
      with pytest.raises(PopulationError, match='both registered initializers'):
          component_set.add(component2.initializer, ['sneaky_column'] + columns)
  
  
  def test_initializer_set():
      component_set = InitializerComponentSet()
      for i in range(10):
          component = Component(i)
          columns = [f'test_column_{i}_{j}' for j in range(5)]
          component_set.add(component.initializer, columns)
  
new_contents: import pandas as pd
  import pytest
  
  from vivarium.framework.population import PopulationView, InitializerComponentSet, PopulationError, PopulationManager
  
  
  class DummyPopulationManager:
      def __init__(self):
          self.get_population = lambda _ : pd.DataFrame({'age': [0, 10, 20, 30, 40, 50, 60, 70], 'sex': ['Male', 'Female']*4})
  
  
  def test_create_PopulationView_with_all_columns():
      manager = DummyPopulationManager()
      view = PopulationView(manager, 0)
      assert set(view.columns) == {'age', 'sex'}
  
  
  def test_initializer_set_fail_type():
      component_set = InitializerComponentSet()
  
      with pytest.raises(TypeError):
          component_set.add(lambda: 'test', ['test_column'])
  
      def initializer():
          return 'test'
  
      with pytest.raises(TypeError):
          component_set.add(initializer, ['test_column'])
  
  
  class UnnamedComponent:
  
      def initializer(self):
          return 'test'
  
  
  class Component:
  
      def __init__(self, name):
          self.name = name
  
      def initializer(self):
          return 'test'
  
      def other_initializer(self):
          return 'whoops'
  
  
  def test_initializer_set_fail_attr():
      component_set = InitializerComponentSet()
  
      with pytest.raises(AttributeError):
          component_set.add(UnnamedComponent().initializer, ['test_column'])
  
  
  def test_initializer_set_duplicate_component():
      component_set = InitializerComponentSet()
      component = Component('test')
  
      component_set.add(component.initializer, ['test_column1'])
      with pytest.raises(PopulationError, match='multiple population initializers'):
          component_set.add(component.other_initializer, ['test_column2'])
  
  
  def test_initializer_set_duplicate_columns():
      component_set = InitializerComponentSet()
      component1 = Component('test1')
      component2 = Component('test2')
      columns = ['test_column']
  
      component_set.add(component1.initializer, columns)
      with pytest.raises(PopulationError, match='both registered initializers'):
          component_set.add(component2.initializer, columns)
  
      with pytest.raises(PopulationError, match='both registered initializers'):
          component_set.add(component2.initializer, ['sneaky_column'] + columns)
  
  
  def test_initializer_set():
      component_set = InitializerComponentSet()
      for i in range(10):
          component = Component(i)
          columns = [f'test_column_{i}_{j}' for j in range(5)]
          component_set.add(component.initializer, columns)
  
  
  def test_get_view_with_no_query():
      manager = PopulationManager()
      view = manager._get_view(columns=['age','sex'])
      assert view.query == 'tracked == True'
  
subject: Add test for _get_view with no query