diff --git a/swap_meet/clothing.py b/swap_meet/clothing.py
index b8afdeb1e..14e81de5d 100644
--- a/swap_meet/clothing.py
+++ b/swap_meet/clothing.py
@@ -1,2 +1,14 @@
-class Clothing:
-    pass
\ No newline at end of file
+from swap_meet.item import Item
+
+class Clothing(Item):
+    def __init__(self, category = "",condition = 0):
+        super().__init__(category = "Clothing", condition = condition)
+        
+        
+    def __str__(self):
+        return "The finest clothing you could wear."
+    
+
+    
+        
+
diff --git a/swap_meet/decor.py b/swap_meet/decor.py
index eab7a9dbe..3ba187c87 100644
--- a/swap_meet/decor.py
+++ b/swap_meet/decor.py
@@ -1,2 +1,10 @@
-class Decor:
-    pass
\ No newline at end of file
+from swap_meet.item import Item
+class Decor(Item):
+    def __init__(self, category = "",condition = 0):
+        super().__init__(category = "Decor", condition = condition)
+        
+    def __str__(self):
+        return "Something to decorate your space."
+    
+    
+    
\ No newline at end of file
diff --git a/swap_meet/electronics.py b/swap_meet/electronics.py
index 2f9dff68a..6f0585609 100644
--- a/swap_meet/electronics.py
+++ b/swap_meet/electronics.py
@@ -1,2 +1,9 @@
-class Electronics:
-    pass
+from swap_meet.item import Item
+class Electronics(Item):
+    def __init__(self, category = "", condition = 0):
+        super().__init__(category = "Electronics", condition = condition)
+        
+    def __str__(self):
+        return "A gadget full of buttons and secrets."
+    
+    
diff --git a/swap_meet/item.py b/swap_meet/item.py
index 560d759c2..eccfe089a 100644
--- a/swap_meet/item.py
+++ b/swap_meet/item.py
@@ -1,2 +1,22 @@
 class Item:
-    pass
\ No newline at end of file
+    def __init__(self, age = 0, category = "", condition = 0):
+        self.category = category
+        self.condition = condition
+        self.age = age
+        
+# Wave 3       
+    def __str__(self):
+        return "Hello World!"
+
+# Wave 5
+    def condition_description(self):
+        condition_descriptions = ["I dont like zero", "I dont like one either", 
+        "Maybe I like two", "Hmmmm.....probably three is nice", "I like four",
+        "Five is a nice number"]
+        return condition_descriptions[self.condition]
+
+        
+
+
+    
+        
diff --git a/swap_meet/vendor.py b/swap_meet/vendor.py
index 87302c056..1a654302b 100644
--- a/swap_meet/vendor.py
+++ b/swap_meet/vendor.py
@@ -1,2 +1,98 @@
 class Vendor:
-    pass
\ No newline at end of file
+    MAX_AGE = 1000
+# Wave 1    
+    def __init__(self, inventory = None):
+        if inventory is None:
+            inventory = []
+        self.inventory = inventory 
+    def add(self,item):
+        self.inventory.append(item)
+        return item
+    def remove(self,item):
+        for inventory_item in self.inventory:
+            if inventory_item == item:
+                self.inventory.remove(item)
+                return item
+        return False
+
+# Wave 2
+    def get_by_category(self, category):
+        item_list = []
+        for item in self.inventory:
+            if item.category == category:
+                item_list.append(item)
+        return item_list
+
+# Wave 3
+    def swap_items(self, friend_vendor, my_item, their_item):
+        if my_item not in self.inventory or their_item not in friend_vendor.inventory:
+            return False 
+
+        self.remove(my_item)
+        friend_vendor.add(my_item)
+        friend_vendor.remove(their_item)
+        self.add(their_item)
+        return True
+        
+
+# Wave 4
+    def swap_first_item(self, friend_vendor):
+        if len(self.inventory) == 0 or len(friend_vendor.inventory) == 0:
+            return False
+
+        return self.swap_items(friend_vendor, self.inventory[0], 
+        friend_vendor.inventory[0])
+
+
+# Wave 6
+
+    def get_best_by_category(self, category): 
+        matching_category_items = self.get_by_category(category)
+        highest_condition = 0
+        highest_item = None
+        for item in matching_category_items:
+            if item.condition > highest_condition:
+                highest_condition = item.condition
+                highest_item = item
+        return highest_item
+
+
+
+    def swap_best_by_category(self, other, my_priority, their_priority):
+        my_best_item = self.get_best_by_category(their_priority)
+        their_best_item = other.get_best_by_category(my_priority)
+        if my_best_item == None or their_best_item == None:
+            return False
+        return self.swap_items(other, my_best_item, their_best_item)
+
+
+# Optional Enhancement
+    def find_newest_item (self):
+        min_item_age = self.MAX_AGE
+        min_item = None
+        for item in self.inventory:
+            if item.age < min_item_age:
+                min_item_age = item.age
+                min_item = item
+        return min_item
+
+    def swap_by_newest(self, friend_vendor):
+        vendor_newest_item = self.find_newest_item()
+        friend_newest_item = friend_vendor.find_newest_item()
+        return self.swap_items(friend_vendor, vendor_newest_item, friend_newest_item)
+
+
+
+
+
+
+                
+                    
+
+
+
+        
+
+
+
+
diff --git a/tests/integration_tests/test_wave_01_02_03.py b/tests/integration_tests/test_wave_01_02_03.py
index 9912414da..34d042fdd 100644
--- a/tests/integration_tests/test_wave_01_02_03.py
+++ b/tests/integration_tests/test_wave_01_02_03.py
@@ -2,8 +2,8 @@
 from swap_meet.vendor import Vendor
 from swap_meet.item import Item
 
-@pytest.mark.skip
-@pytest.mark.integration_test
+# @pytest.mark.skip
+# @pytest.mark.integration_test
 def test_integration_wave_01_02_03():
     # make a vendor  
     vendor = Vendor()
diff --git a/tests/integration_tests/test_wave_04_05_06.py b/tests/integration_tests/test_wave_04_05_06.py
index 4d0be9909..cb3b346a2 100644
--- a/tests/integration_tests/test_wave_04_05_06.py
+++ b/tests/integration_tests/test_wave_04_05_06.py
@@ -4,8 +4,8 @@
 from swap_meet.decor import Decor
 from swap_meet.electronics import Electronics
 
-@pytest.mark.skip
-@pytest.mark.integration_test
+# @pytest.mark.skip
+# @pytest.mark.integration_test
 def test_integration_wave_04_05_06():
     camila = Vendor()
     valentina = Vendor()
diff --git a/tests/unit_tests/test_wave_01.py b/tests/unit_tests/test_wave_01.py
index 58478ccf9..19868ee5d 100644
--- a/tests/unit_tests/test_wave_01.py
+++ b/tests/unit_tests/test_wave_01.py
@@ -2,12 +2,12 @@
 import pytest
 from swap_meet.vendor import Vendor
 
-@pytest.mark.skip
+# @pytest.mark.skip
 def test_vendor_has_inventory():
     vendor = Vendor()
     assert len(vendor.inventory) == 0
 
-@pytest.mark.skip
+# @pytest.mark.skip
 def test_vendor_takes_optional_inventory():
     inventory = ["a", "b", "c"]
     vendor = Vendor(inventory=inventory)
@@ -16,7 +16,7 @@ def test_vendor_takes_optional_inventory():
     assert "b" in vendor.inventory
     assert "c" in vendor.inventory
 
-@pytest.mark.skip
+# # @pytest.mark.skip
 def test_adding_to_inventory():
     vendor = Vendor()
     item = "new item"
@@ -27,7 +27,7 @@ def test_adding_to_inventory():
     assert item in vendor.inventory
     assert result == item
 
-@pytest.mark.skip
+# @pytest.mark.skip
 def test_removing_from_inventory_returns_item():
     item = "item to remove"
     vendor = Vendor(
@@ -40,7 +40,7 @@ def test_removing_from_inventory_returns_item():
     assert item not in vendor.inventory
     assert result == item
 
-@pytest.mark.skip
+# @pytest.mark.skip
 def test_removing_not_found_is_false():
     item = "item to remove"
     vendor = Vendor(
@@ -49,7 +49,11 @@ def test_removing_not_found_is_false():
 
     result = vendor.remove(item)
 
-    raise Exception("Complete this test according to comments below.")
-    # *********************************************************************
-    # ****** Complete Assert Portion of this test **********
-    # *********************************************************************
+    assert len(vendor.inventory) == 3
+    assert item not in vendor.inventory
+    assert result == False
+
+#     raise Exception("Complete this test according to comments below.")
+#     # *********************************************************************
+#     # ****** Complete Assert Portion of this test **********
+#     # *********************************************************************
diff --git a/tests/unit_tests/test_wave_02.py b/tests/unit_tests/test_wave_02.py
index 3d7060d7c..6701eb277 100644
--- a/tests/unit_tests/test_wave_02.py
+++ b/tests/unit_tests/test_wave_02.py
@@ -2,12 +2,12 @@
 from swap_meet.vendor import Vendor
 from swap_meet.item import Item
 
-@pytest.mark.skip
+# @pytest.mark.skip
 def test_items_have_blank_default_category():
     item = Item()
     assert item.category == ""
 
-@pytest.mark.skip
+# @pytest.mark.skip
 def test_get_items_by_category():
     item_a = Item(category="clothing")
     item_b = Item(category="electronics")
@@ -23,7 +23,7 @@ def test_get_items_by_category():
     assert item_c in items
     assert item_b not in items
 
-@pytest.mark.skip
+# @pytest.mark.skip
 def test_get_no_matching_items_by_category():
     item_a = Item(category="clothing")
     item_b = Item(category="clothing")
@@ -34,7 +34,12 @@ def test_get_no_matching_items_by_category():
 
     items = vendor.get_by_category("electronics")
 
-    raise Exception("Complete this test according to comments below.")
-    # *********************************************************************
-    # ****** Complete Assert Portion of this test **********
-    # *********************************************************************
+    assert len(items) == 0
+    assert item_a not in items
+    assert item_c not in items
+    assert item_b not in items
+
+#     raise Exception("Complete this test according to comments below.")
+#     # *********************************************************************
+#     # ****** Complete Assert Portion of this test **********
+#     # *********************************************************************
diff --git a/tests/unit_tests/test_wave_03.py b/tests/unit_tests/test_wave_03.py
index 0300b638f..2d573fa52 100644
--- a/tests/unit_tests/test_wave_03.py
+++ b/tests/unit_tests/test_wave_03.py
@@ -2,7 +2,7 @@
 from swap_meet.vendor import Vendor
 from swap_meet.item import Item
 
-@pytest.mark.skip
+# @pytest.mark.skip
 def test_item_overrides_to_string():
     item = Item()
 
@@ -10,7 +10,7 @@ def test_item_overrides_to_string():
 
     assert stringified_item == "Hello World!"
 
-@pytest.mark.skip
+# @pytest.mark.skip
 def test_swap_items_returns_true():
     item_a = Item(category="clothing")
     item_b = Item(category="clothing")
@@ -38,7 +38,7 @@ def test_swap_items_returns_true():
     assert item_b in jolie.inventory
     assert result
 
-@pytest.mark.skip
+# @pytest.mark.skip
 def test_swap_items_when_my_item_is_missing_returns_false():
     item_a = Item(category="clothing")
     item_b = Item(category="clothing")
@@ -65,7 +65,7 @@ def test_swap_items_when_my_item_is_missing_returns_false():
     assert item_e in jolie.inventory
     assert not result
 
-@pytest.mark.skip
+# @pytest.mark.skip
 def test_swap_items_when_their_item_is_missing_returns_false():
     item_a = Item(category="clothing")
     item_b = Item(category="clothing")
@@ -92,7 +92,7 @@ def test_swap_items_when_their_item_is_missing_returns_false():
     assert item_e in jolie.inventory
     assert not result
 
-@pytest.mark.skip
+# @pytest.mark.skip
 def test_swap_items_from_my_empty_returns_false():
     fatimah = Vendor(
         inventory=[]
@@ -112,7 +112,7 @@ def test_swap_items_from_my_empty_returns_false():
     assert len(jolie.inventory) == 2
     assert not result
 
-@pytest.mark.skip
+# @pytest.mark.skip
 def test_swap_items_from_their_empty_returns_false():
     item_a = Item(category="clothing")
     item_b = Item(category="clothing")
diff --git a/tests/unit_tests/test_wave_04.py b/tests/unit_tests/test_wave_04.py
index 8190a4ebb..4ef21ff8e 100644
--- a/tests/unit_tests/test_wave_04.py
+++ b/tests/unit_tests/test_wave_04.py
@@ -2,7 +2,7 @@
 from swap_meet.vendor import Vendor
 from swap_meet.item import Item
 
-@pytest.mark.skip
+# @pytest.mark.skip
 def test_swap_first_item_returns_true():
     item_a = Item(category="clothing")
     item_b = Item(category="clothing")
@@ -30,7 +30,7 @@ def test_swap_first_item_returns_true():
     assert item_a in jolie.inventory
     assert result
 
-@pytest.mark.skip
+# @pytest.mark.skip
 def test_swap_first_item_from_my_empty_returns_false():
     fatimah = Vendor(
         inventory=[]
@@ -48,7 +48,7 @@ def test_swap_first_item_from_my_empty_returns_false():
     assert len(jolie.inventory) == 2
     assert not result
 
-@pytest.mark.skip
+# @pytest.mark.skip
 def test_swap_first_item_from_their_empty_returns_false():
     item_a = Item(category="clothing")
     item_b = Item(category="clothing")
diff --git a/tests/unit_tests/test_wave_05.py b/tests/unit_tests/test_wave_05.py
index 7abea06cd..fdeb063a9 100644
--- a/tests/unit_tests/test_wave_05.py
+++ b/tests/unit_tests/test_wave_05.py
@@ -3,25 +3,25 @@
 from swap_meet.decor import Decor
 from swap_meet.electronics import Electronics
 
-@pytest.mark.skip
+# @pytest.mark.skip
 def test_clothing_has_default_category_and_to_str():
     cloth = Clothing()
     assert cloth.category == "Clothing"
     assert str(cloth) == "The finest clothing you could wear."
 
-@pytest.mark.skip
+# @pytest.mark.skip
 def test_decor_has_default_category_and_to_str():
     decor = Decor()
     assert decor.category == "Decor"
     assert str(decor) == "Something to decorate your space."
 
-@pytest.mark.skip
+# @pytest.mark.skip
 def test_electronics_has_default_category_and_to_str():
     electronics = Electronics()
     assert electronics.category == "Electronics"
     assert str(electronics) == "A gadget full of buttons and secrets."
 
-@pytest.mark.skip
+# @pytest.mark.skip
 def test_items_have_condition_as_float():
     items = [
         Clothing(condition=3.5),
@@ -31,7 +31,7 @@ def test_items_have_condition_as_float():
     for item in items:
         assert item.condition == pytest.approx(3.5)
 
-@pytest.mark.skip
+# @pytest.mark.skip
 def test_items_have_condition_descriptions_that_are_the_same_regardless_of_type():
     items = [
         Clothing(condition=5),
diff --git a/tests/unit_tests/test_wave_06.py b/tests/unit_tests/test_wave_06.py
index 1f7065ab4..bc4a68812 100644
--- a/tests/unit_tests/test_wave_06.py
+++ b/tests/unit_tests/test_wave_06.py
@@ -3,8 +3,9 @@
 from swap_meet.clothing import Clothing
 from swap_meet.decor import Decor
 from swap_meet.electronics import Electronics
+from swap_meet.item import Item
 
-@pytest.mark.skip
+# @pytest.mark.skip
 def test_best_by_category():
     item_a = Clothing(condition=2.0)
     item_b = Decor(condition=2.0)
@@ -20,7 +21,7 @@ def test_best_by_category():
     assert best_item.category == "Clothing"
     assert best_item.condition == pytest.approx(4.0)
 
-@pytest.mark.skip
+# @pytest.mark.skip
 def test_best_by_category_no_matches_is_none():
     item_a = Decor(condition=2.0)
     item_b = Decor(condition=2.0)
@@ -33,7 +34,7 @@ def test_best_by_category_no_matches_is_none():
 
     assert best_item is None
 
-@pytest.mark.skip
+# @pytest.mark.skip
 def test_best_by_category_with_duplicates():
     # Arrange
     item_a = Clothing(condition=2.0)
@@ -50,7 +51,7 @@ def test_best_by_category_with_duplicates():
     assert best_item.category == "Clothing"
     assert best_item.condition == pytest.approx(4.0)
 
-@pytest.mark.skip
+# @pytest.mark.skip
 def test_swap_best_by_category():
     # Arrange
     # me
@@ -60,6 +61,7 @@ def test_swap_best_by_category():
     tai = Vendor(
         inventory=[item_a, item_b, item_c]
     )
+    actual_length_tai = len(tai.inventory)
 
     # them
     item_d = Clothing(condition=2.0)
@@ -68,6 +70,7 @@ def test_swap_best_by_category():
     jesse = Vendor(
         inventory=[item_d, item_e, item_f]
     )
+    actual_length_jesse = len(jesse.inventory)
 
     # Act
     result = tai.swap_best_by_category(
@@ -76,16 +79,34 @@ def test_swap_best_by_category():
         their_priority="Decor"
     )
 
-    raise Exception("Complete this test according to comments below.")
-    # *********************************************************************
-    # ****** Complete Assert Portion of this test **********
-    # *********************************************************************
-    # Assertions should check:
-    # - That the results is truthy
-    # - That tai and jesse's inventories are the correct length
-    # - That all the correct items are in tai and jesse's inventories, including the items which were swapped from one vendor to the other
+#     raise Exception("Complete this test according to comments below.")
+#     # *********************************************************************
+#     # ****** Complete Assert Portion of this test **********
+#     # *********************************************************************
+#     # Assertions should check:
+#     # - That the results is truthy
+#     # - That tai and jesse's inventories are the correct length
+#     # - That all the correct items are in tai and jesse's inventories, including the items which were swapped from one vendor to the other
+    
+    # Assert
+    assert result == True
+    expected_length_tai = len(tai.inventory)
+    assert expected_length_tai == actual_length_tai
+
+    expected_length_jesse = len(jesse.inventory)
+    assert expected_length_jesse == actual_length_jesse
+
+    assert (item_f in tai.inventory) == True
+    assert (item_c not in tai.inventory) == True 
+    assert (item_c in jesse.inventory) == True
+    assert (item_f not in jesse.inventory) == True 
+
+
+
 
-@pytest.mark.skip
+    
+
+# @pytest.mark.skip
 def test_swap_best_by_category_reordered():
     # Arrange
     item_a = Decor(condition=2.0)
@@ -94,6 +115,7 @@ def test_swap_best_by_category_reordered():
     tai = Vendor(
         inventory=[item_c, item_b, item_a]
     )
+    actual_length_tai = len(tai.inventory)
 
     item_d = Clothing(condition=2.0)
     item_e = Decor(condition=4.0)
@@ -101,6 +123,7 @@ def test_swap_best_by_category_reordered():
     jesse = Vendor(
         inventory=[item_f, item_e, item_d]
     )
+    actual_length_jesse = len(jesse.inventory)
 
     # Act
     result = tai.swap_best_by_category(
@@ -109,16 +132,29 @@ def test_swap_best_by_category_reordered():
         their_priority="Decor"
     )
 
-    raise Exception("Complete this test according to comments below.")
-    # *********************************************************************
-    # ****** Complete Assert Portion of this test **********
-    # *********************************************************************
-    # Assertions should check:
-    # - That result is truthy
-    # - That tai and jesse's inventories are the correct length
-    # - That all the correct items are in tai and jesse's inventories, and that the items that were swapped are not there
-
-@pytest.mark.skip
+    # Assert
+    assert result == True
+    expected_length_tai = len(tai.inventory)
+    assert expected_length_tai == actual_length_tai
+
+    expected_length_jesse = len(jesse.inventory)
+    assert expected_length_jesse == actual_length_jesse
+
+    assert (item_f in tai.inventory) == True
+    assert (item_c not in tai.inventory) == True 
+    assert (item_c in jesse.inventory) == True
+    assert (item_f not in jesse.inventory) == True 
+
+#     raise Exception("Complete this test according to comments below.")
+#     # *********************************************************************
+#     # ****** Complete Assert Portion of this test **********
+#     # *********************************************************************
+#     # Assertions should check:
+#     # - That result is truthy
+#     # - That tai and jesse's inventories are the correct length
+#     # - That all the correct items are in tai and jesse's inventories, and that the items that were swapped are not there
+
+# @pytest.mark.skip
 def test_swap_best_by_category_no_inventory_is_false():
     tai = Vendor(
         inventory=[]
@@ -144,7 +180,7 @@ def test_swap_best_by_category_no_inventory_is_false():
     assert item_b in jesse.inventory
     assert item_c in jesse.inventory
 
-@pytest.mark.skip
+# @pytest.mark.skip
 def test_swap_best_by_category_no_other_inventory_is_false():
     item_a = Clothing(condition=2.0)
     item_b = Decor(condition=4.0)
@@ -170,7 +206,7 @@ def test_swap_best_by_category_no_other_inventory_is_false():
     assert item_b in tai.inventory
     assert item_c in tai.inventory
 
-@pytest.mark.skip
+# @pytest.mark.skip
 def test_swap_best_by_category_no_match_is_false():
     # Arrange
     item_a = Decor(condition=2.0)
@@ -179,6 +215,7 @@ def test_swap_best_by_category_no_match_is_false():
     tai = Vendor(
         inventory=[item_a, item_b, item_c]
     )
+    actual_length_tai = len(tai.inventory)
 
     item_d = Clothing(condition=2.0)
     item_e = Decor(condition=4.0)
@@ -186,6 +223,7 @@ def test_swap_best_by_category_no_match_is_false():
     jesse = Vendor(
         inventory=[item_d, item_e, item_f]
     )
+    actual_length_jesse = len(jesse.inventory)
 
     # Act
     result = tai.swap_best_by_category(
@@ -194,16 +232,31 @@ def test_swap_best_by_category_no_match_is_false():
         their_priority="Clothing"
     )
 
-    raise Exception("Complete this test according to comments below.")
-    # *********************************************************************
-    # ****** Complete Assert Portion of this test **********
-    # *********************************************************************
-    # Assertions should check:
-    # - That result is falsy
-    # - That tai and jesse's inventories are the correct length
-    # - That all the correct items are in tai and jesse's inventories
-
-@pytest.mark.skip
+    # Assert
+    assert result == False
+    expected_length_tai = len(tai.inventory)
+    assert expected_length_tai == actual_length_tai
+
+    expected_length_jesse = len(jesse.inventory)
+    assert expected_length_jesse == actual_length_jesse
+
+    assert (item_a in tai.inventory) == True
+    assert (item_b in tai.inventory) == True 
+    assert (item_c in tai.inventory) == True 
+    assert (item_d in jesse.inventory) == True
+    assert (item_e in jesse.inventory) == True
+    assert (item_f in jesse.inventory) == True 
+
+#     raise Exception("Complete this test according to comments below.")
+#     # *********************************************************************
+#     # ****** Complete Assert Portion of this test **********
+#     # *********************************************************************
+#     # Assertions should check:
+#     # - That result is falsy
+#     # - That tai and jesse's inventories are the correct length
+#     # - That all the correct items are in tai and jesse's inventories
+
+# @pytest.mark.skip
 def test_swap_best_by_category_no_other_match_is_false():
     # Arrange
     item_a = Decor(condition=2.0)
@@ -212,6 +265,7 @@ def test_swap_best_by_category_no_other_match_is_false():
     tai = Vendor(
         inventory=[item_c, item_b, item_a]
     )
+    actual_length_tai = len(tai.inventory)
 
     item_d = Clothing(condition=2.0)
     item_e = Decor(condition=4.0)
@@ -219,6 +273,7 @@ def test_swap_best_by_category_no_other_match_is_false():
     jesse = Vendor(
         inventory=[item_f, item_e, item_d]
     )
+    actual_length_jesse = len(jesse.inventory)
 
     # Act
     result = tai.swap_best_by_category(
@@ -227,11 +282,61 @@ def test_swap_best_by_category_no_other_match_is_false():
         their_priority="Decor"
     )
 
-    raise Exception("Complete this test according to comments below.")
-    # *********************************************************************
-    # ****** Complete Assert Portion of this test **********
-    # *********************************************************************
-    # Assertions should check:
-    # - That result is falsy
-    # - That tai and jesse's inventories are the correct length
-    # - That all the correct items are in tai and jesse's inventories
+    # Assert
+    assert result == False
+    expected_length_tai = len(tai.inventory)
+    assert expected_length_tai == actual_length_tai
+
+    expected_length_jesse = len(jesse.inventory)
+    assert expected_length_jesse == actual_length_jesse
+
+    assert (item_a in tai.inventory) == True
+    assert (item_b in tai.inventory) == True 
+    assert (item_c in tai.inventory) == True 
+    assert (item_d in jesse.inventory) == True
+    assert (item_e in jesse.inventory) == True
+    assert (item_f in jesse.inventory) == True 
+
+#     raise Exception("Complete this test according to comments below.")
+#     # *********************************************************************
+#     # ****** Complete Assert Portion of this test **********
+#     # *********************************************************************
+#     # Assertions should check:
+#     # - That result is falsy
+#     # - That tai and jesse's inventories are the correct length
+#     # - That all the correct items are in tai and jesse's inventories
+
+# Optional enhancement 
+# @pytest.mark.skip
+def test_swap_by_newest_returns_True():
+    # Arrange
+    item_a = Item(age = 5)
+    item_b = Item(age = 1)
+    item_c = Item(age = 13)
+    fatimah = Vendor(
+        inventory=[item_a, item_b, item_c]
+    )
+
+    item_d = Item(age = 6)
+    item_e = Item(age = 2) 
+    jolie = Vendor(
+        inventory=[item_d, item_e]
+    )
+    # Act
+
+    result = fatimah.swap_items(jolie, item_b, item_e)
+
+    # Assert
+
+    assert len(fatimah.inventory) == 3
+    assert item_b not in fatimah.inventory
+    assert item_a in fatimah.inventory
+    assert item_c in fatimah.inventory
+    assert item_e in fatimah.inventory
+    assert len(jolie.inventory) == 2
+    assert item_e not in jolie.inventory
+    assert item_d in jolie.inventory
+    assert item_b in jolie.inventory
+    assert result
+
+