Adding dequeue test to make list work like a queue.

linked_lists/linked_list_test.rb

@@ -19,6 +19,7 @@ def test_it_pushes_three_elements_onto_a_list
     list.push("hello")
     list.push("world")
     list.push("today")
+
     assert_equal 3, list.count
   end
 
@@ -27,36 +28,45 @@ def test_it_pops_the_last_element_from_the_list
     list.push("hello")
     list.push("world")
     list.push("today")
+
     output = list.pop
+
     assert_equal "today", output
     assert_equal 2, list.count
   end
 
   def test_a_popped_element_is_removed
     skip
     list.push("hello")
+
     output = list.pop
+
     assert_equal "hello", output
     assert_equal 0, list.count
   end
 
   def test_it_pops_nil_when_there_are_no_elements
     skip
+
     assert_nil list.pop
   end
 
   def test_it_deletes_a_solo_node
     skip
     list.push("hello")
+
     list.delete("hello")
+
     assert_equal 0, list.count
   end
 
   def test_it_does_not_delete_when_the_data_does_not_match
     skip
     list.push("hello")
     list.push("world")
+
     list.delete("today")
+
     assert_equal 2, list.count
   end
 
@@ -65,7 +75,9 @@ def test_it_deletes_a_last_node
     list.push("hello")
     list.push("world")
     list.push("today")
+
     list.delete("today")
+
     assert_equal 2, list.count
   end
 
@@ -74,7 +86,9 @@ def test_it_deletes_a_middle_node
     list.push("hello")
     list.push("world")
     list.push("today")
+
     list.delete("world")
+
     assert_equal 2, list.count
     assert_equal "today", list.pop
     assert_equal "hello", list.pop
@@ -85,14 +99,17 @@ def test_it_deletes_the_head_when_there_are_more_nodes
     list.push("hello")
     list.push("world")
     list.push("today")
+
     list.delete("hello")
+
     assert_equal 2, list.count
     assert_equal "today", list.pop
     assert_equal "world", list.pop
   end
 
   def test_it_converts_to_an_array_when_there_are_no_elements
     skip
+
     assert_equal [], list.to_a
   end
 
@@ -101,35 +118,41 @@ def test_it_converts_to_an_array_with_several_elements
     list.push("hello")
     list.push("world")
     list.push("today")
+
     assert_equal ["hello", "world", "today"], list.to_a
   end
 
   def test_it_finds_the_last_node
     skip
     list.push("hello")
     list.push("world")
+
     node = list.last_node
+
     assert_equal "world", node.data
   end
 
   def test_a_node_links_to_its_next_element
     skip
     list.push("hello")
     list.push("world")
+
     assert_equal "world", list.last_node.data
     assert_equal "world", list.head_node.next_node.data
   end
 
   def test_next_node_for_the_last_node_is_nil
     skip
     list.push("world")
+
     assert_nil list.last_node.next_node
   end
 
   def test_find_if_an_element_is_included_in_the_list
     skip
     list.push("hello")
     list.push("world")
+
     assert_equal true, list.include?("hello")
     assert_equal false, list.include?("bogus")
   end
@@ -181,16 +204,31 @@ def test_insert_after_adds_a_node_after_a_given_node
   end
 
   def test_distance_returns_distance_between_two_nodes
+    skip
     list.push("hello")
     list.push("pizza")
     list.push("world")
     list.push("today")
     list.push("tomorrow")
+
     assert_equal 3, list.distance("hello", "today")
     assert_equal 2, list.distance("pizza", "today")
     assert_equal 2, list.distance("hello", "world")
     assert_equal 4, list.distance("hello", "tomorrow")
     assert_equal 1, list.distance("world", "today")
   end
-
+
+  def test_dequeue_treates_list_like_a_stack
+    skip
+    list.push("hello")
+    list.push("pizza")
+    list.push("world")
+
+    list.dequeue
+
+    assert_equal false, list.include?("hello")
+    assert_equal true, list.include?("pizza")
+    assert_equal 2, list.count
+  end
+
 end