## L1. Append Multiple Nodes and Count

def test_(self):

  import list
  list = list.List()
  self.assertEquals(list.count(), 0)
  list.append("one")
  list.append("two")
  list.append("three")
  list.append("four")
  list.append("five")
  self.assertEquals(list.count(), 5)

## L2. Find Index Of

def test_(self):
  import list
  list = list.List()
  list.append("one")
  list.append("two")
  list.append("three")
  list.append("four")
  list.append("five")
  self.assertEquals(list.find_index_of("four"), 3)

## L2. Attempt to Find Things That Don't Exist

def test_(self):

  import list
  list = list.List()
  self.assertEquals(list.find_value_at(4), None)
  self.assertEquals(list.find_index_of("four"), None)
  list.append("one")
  list.append("two")
  list.append("three")
  self.assertEquals(list.find_value_at(3), None)
  self.assertEquals(list.find_index_of("four"), None)
  
## L2. Find the Value at a Position

def test_(self):

  import list
  list = list.List()
  list.append("one")
  list.append("two")
  list.append("three")
  list.append("four")
  list.append("five")
  self.assertEquals(list.find_value_at(4), "five")
  
## L3. Insert at a Position

def test_(self):
    import list
    list = list.List()
    list.append("A")
    list.append("C")
    list.insert_at_position(1, "B")
    self.assertEqual(list.find_index_of("B"), 1)
    list.insert_at_position(3, "D")
    self.assertEqual(list.find_index_of("D"), 3)
    list.insert_at_position(0, "Z")
    self.assertEqual(list.find_index_of("Z"), 0)

## L4. Delete by Position To Clear a List

def test_(self):
  import list
  list = list.List()
  list.append("A")
  list.append("B")
  self.assertEqual(list.count(), 2)
  list.delete_at_position(1)
  list.delete_at_position(0)
  self.assertEqual(list.count(), 0)

## L4. Delete by Position Complex Sequence

def test_(self):
    import list
    list = list.List()
    list.append("A")
    list.append("B")
    list.append("C")
    list.append("D")
    list.append("E")
    list.delete_at_position(0)
    self.assertEqual(list.find_index_of("B"), 0)
    list.delete_at_position(1)
    self.assertEqual(list.find_index_of("B"), 0)
    self.assertEqual(list.find_index_of("C"), None)
    self.assertEqual(list.find_index_of("D"), 1)
    list.delete_at_position(1)
    self.assertEqual(list.find_index_of("B"), 0)
    self.assertEqual(list.find_index_of("E"), 1)
    self.assertEqual(list.count(), 2)
    list.delete_at_position(1)
    list.delete_at_position(0)
    self.assertEqual(list.count(), 0)

## L4. Delete by Value Sequence

def test_(self):
  import list
  list = list.List()
  list.append("A")
  list.append("B")
  list.append("C")
  list.append("D")
  list.append("E")
  list.delete_value("C")
  self.assertEqual(list.find_index_of("D"), 2)
  list.delete_value("A")
  self.assertEqual(list.find_index_of("B"), 0)
  list.delete_value("E")
  self.assertEqual(list.count(), 2)
  list.delete_value("B")
  list.delete_value("D")
  self.assertEqual(list.count(), 0)

## L4. Delete by Value Edge Cases

def test_(self):
  import list
  list = list.List()
  list.delete_value("A")
  list.append("A")
  list.append("B")
  list.append("A")
  self.assertEqual(list.count(), 3)
  list.delete_value("A")
  self.assertEqual(list.count(), 2)
  list.delete_value("C")
  self.assertEqual(list.count(), 2)