diff --git a/swap_meet/clothing.py b/swap_meet/clothing.py
index b8afdeb1e..6f74b23af 100644
--- a/swap_meet/clothing.py
+++ b/swap_meet/clothing.py
@@ -1,2 +1,9 @@
-class Clothing:
-    pass
\ No newline at end of file
+from swap_meet.item import Item
+
+class Clothing(Item):
+    
+    def __init__(self, condition=0, age=0):
+        super().__init__("Clothing", condition, age)
+
+    def __str__(self):
+        return "The finest clothing you could wear."
diff --git a/swap_meet/decor.py b/swap_meet/decor.py
index eab7a9dbe..fd9f318ae 100644
--- a/swap_meet/decor.py
+++ b/swap_meet/decor.py
@@ -1,2 +1,9 @@
-class Decor:
-    pass
\ No newline at end of file
+from swap_meet.item import Item
+
+class Decor(Item):
+    
+    def __init__(self, condition=0, age=0):
+        super().__init__("Decor", condition, age)
+
+    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..1c7bb6317 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, condition=0, age=0):
+        super().__init__("Electronics", condition, age)
+
+    def __str__(self):
+        return "A gadget full of buttons and secrets."
\ No newline at end of file
diff --git a/swap_meet/item.py b/swap_meet/item.py
index 560d759c2..b98ed5bdc 100644
--- a/swap_meet/item.py
+++ b/swap_meet/item.py
@@ -1,2 +1,23 @@
+CONDITION_DESC = {
+    0: "you might as well buy a new one",
+    1: "barely hanging on",
+    2: "pretty used",
+    3: "kinda used",
+    4: "newish",
+    5: "mint"
+}
+
 class Item:
-    pass
\ No newline at end of file
+    
+    def __init__(self, category='', condition=0, age=0):
+        self.category = category
+        self.condition = condition
+        self.age = age
+
+    def __str__(self):
+        return "Hello World!"
+
+######################################## WAVE 5 #########################################
+
+    def condition_description(self):
+        return CONDITION_DESC[int(self.condition)]
diff --git a/swap_meet/vendor.py b/swap_meet/vendor.py
index 87302c056..2747e882f 100644
--- a/swap_meet/vendor.py
+++ b/swap_meet/vendor.py
@@ -1,2 +1,83 @@
+from swap_meet.item import Item
+
 class Vendor:
-    pass
\ No newline at end of file
+
+######################################## WAVE 1 #########################################
+    
+    def __init__(self, inventory=None, modifier=None):
+        if inventory is None:
+            inventory = []
+        self.inventory = inventory
+        self.modifier = modifier
+
+
+    def add(self, item):
+        self.inventory.append(item)
+        return item
+
+
+    def remove(self, item):
+        try:
+            self.inventory.remove(item)
+            return item
+        except:
+            return False
+
+
+######################################## WAVE 2 #########################################
+
+    def get_by_category(self, category):
+        category_items = [item for item in self.inventory if item.category == category]
+        return category_items
+
+
+######################################## WAVE 3 #########################################
+
+    def swap_items(self, other, my_item, their_item):
+        if my_item in self.inventory and their_item in other.inventory:
+            self.add(other.remove(their_item))
+            other.add(self.remove(my_item))
+            return True
+        else: 
+            return False
+
+
+######################################## WAVE 4 #########################################
+
+    def swap_first_item(self, other):
+        try:
+            return self.swap_items(other, self.inventory[0],other.inventory[0])
+        except:
+            return False
+
+
+######################################## WAVE 6 #########################################
+
+    def get_best_by_category(self, category):
+        try:
+            best_item = max(self.get_by_category(category), key=lambda item:item.condition)
+            return best_item
+        except:
+            return None
+
+
+    def swap_best_by_category(self, other, my_priority, their_priority):
+        my_offer =  self.get_best_by_category(their_priority)
+        their_offer = other.get_best_by_category(my_priority)
+        return self.swap_items(other, my_offer, their_offer)
+
+
+######################################## WAVE 7 #########################################
+
+    def get_newest(self):
+        try:
+            newest_item = min(self.inventory, key=lambda item:item.age)
+            return newest_item
+        except:
+            return None
+
+    def swap_by_newest(self, other):
+        my_offer =  self.get_newest()
+        their_offer = other.get_newest()
+        return self.swap_items(other, my_offer, their_offer)
+
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..6fb4e5349 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 +49,10 @@ def test_removing_not_found_is_false():
 
     result = vendor.remove(item)
 
-    raise Exception("Complete this test according to comments below.")
+    # 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
     # *********************************************************************
diff --git a/tests/unit_tests/test_wave_02.py b/tests/unit_tests/test_wave_02.py
index 3d7060d7c..1f530c8e0 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 +34,11 @@ def test_get_no_matching_items_by_category():
 
     items = vendor.get_by_category("electronics")
 
-    raise Exception("Complete this test according to comments below.")
+    # 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 
     # *********************************************************************
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..ba81f89f1 100644
--- a/tests/unit_tests/test_wave_06.py
+++ b/tests/unit_tests/test_wave_06.py
@@ -4,7 +4,7 @@
 from swap_meet.decor import Decor
 from swap_meet.electronics import Electronics
 
-@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 +20,7 @@ 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 +33,7 @@ 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 +50,7 @@ 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
@@ -76,16 +76,21 @@ def test_swap_best_by_category():
         their_priority="Decor"
     )
 
-    raise Exception("Complete this test according to comments below.")
+    # raise Exception("Complete this test according to comments below.")
     # *********************************************************************
     # ****** Complete Assert Portion of this test **********
+    assert result == True
+    assert len(tai.inventory) == 3
+    assert len(jesse.inventory) == 3
+    assert tai.inventory == [item_a, item_b, item_f]
+    assert jesse.inventory == [item_d, item_e, item_c]
     # *********************************************************************
     # 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
 
-@pytest.mark.skip
+# @pytest.mark.skip
 def test_swap_best_by_category_reordered():
     # Arrange
     item_a = Decor(condition=2.0)
@@ -109,16 +114,21 @@ def test_swap_best_by_category_reordered():
         their_priority="Decor"
     )
 
-    raise Exception("Complete this test according to comments below.")
+    # raise Exception("Complete this test according to comments below.")
     # *********************************************************************
     # ****** Complete Assert Portion of this test **********
+    assert result == True
+    assert len(tai.inventory) == 3
+    assert len(jesse.inventory) == 3
+    assert tai.inventory == [item_b, item_a, item_f]
+    assert jesse.inventory == [item_e, item_d, item_c]
     # *********************************************************************
     # 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
+# @pytest.mark.skip
 def test_swap_best_by_category_no_inventory_is_false():
     tai = Vendor(
         inventory=[]
@@ -144,7 +154,7 @@ 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 +180,7 @@ 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)
@@ -194,16 +204,21 @@ def test_swap_best_by_category_no_match_is_false():
         their_priority="Clothing"
     )
 
-    raise Exception("Complete this test according to comments below.")
+    # raise Exception("Complete this test according to comments below.")
     # *********************************************************************
     # ****** Complete Assert Portion of this test **********
+    assert result == False
+    assert len(tai.inventory) == 3
+    assert len(jesse.inventory) == 3
+    assert tai.inventory == [item_a, item_b, item_c]
+    assert jesse.inventory == [item_d, item_e, item_f]
     # *********************************************************************
     # 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
+# @pytest.mark.skip
 def test_swap_best_by_category_no_other_match_is_false():
     # Arrange
     item_a = Decor(condition=2.0)
@@ -227,9 +242,14 @@ def test_swap_best_by_category_no_other_match_is_false():
         their_priority="Decor"
     )
 
-    raise Exception("Complete this test according to comments below.")
+    # raise Exception("Complete this test according to comments below.")
     # *********************************************************************
     # ****** Complete Assert Portion of this test **********
+    assert result == False
+    assert len(tai.inventory) == 3
+    assert len(jesse.inventory) == 3
+    assert tai.inventory == [item_c, item_b, item_a]
+    assert jesse.inventory == [item_f, item_e, item_d]
     # *********************************************************************
     # Assertions should check:
     # - That result is falsy
diff --git a/tests/unit_tests/test_wave_07.py b/tests/unit_tests/test_wave_07.py
new file mode 100644
index 000000000..29e7a72e8
--- /dev/null
+++ b/tests/unit_tests/test_wave_07.py
@@ -0,0 +1,159 @@
+import pytest
+from swap_meet.vendor import Vendor
+from swap_meet.clothing import Clothing
+from swap_meet.decor import Decor
+from swap_meet.electronics import Electronics
+
+# @pytest.mark.skip
+def test_newest():
+    item_a = Clothing(age=1.0)
+    item_b = Decor(age=2.0)
+    item_c = Clothing(age=4.0)
+    item_d = Decor(age=5.0)
+    item_e = Clothing(age=3.0)
+    tai = Vendor(
+        inventory=[item_a, item_b, item_c, item_d, item_e]
+    )
+
+    newest_item = tai.get_newest()
+
+    assert newest_item.age == pytest.approx(1.0)
+
+# @pytest.mark.skip
+def test_newest_with_duplicates():
+    # Arrange
+    item_a = Clothing(age=2.0)
+    item_b = Decor(age=2.0)
+    item_c = Clothing(age=4.0)
+    tai = Vendor(
+        inventory=[item_a, item_b, item_c]
+    )
+
+    # Act
+    newest_item = tai.get_newest()
+
+    # Assert
+    assert newest_item.category == "Clothing"
+    assert newest_item.age == pytest.approx(2.0)
+
+# @pytest.mark.skip
+def test_swap_newest():
+    # Arrange
+    # me
+    item_a = Decor(age=2.0)
+    item_b = Electronics(age=4.0)
+    item_c = Decor(age=4.0)
+    tai = Vendor(
+        inventory=[item_a, item_b, item_c]
+    )
+
+    # them
+    item_d = Clothing(age=2.0)
+    item_e = Decor(age=4.0)
+    item_f = Clothing(age=4.0)
+    jesse = Vendor(
+        inventory=[item_d, item_e, item_f]
+    )
+
+    # Act
+    result = tai.swap_by_newest(
+        other=jesse
+    )
+
+    # raise Exception("Complete this test according to comments below.")
+    # *********************************************************************
+    # ****** Complete Assert Portion of this test **********
+    assert result == True
+    assert len(tai.inventory) == 3
+    assert len(jesse.inventory) == 3
+    assert tai.inventory == [item_b, item_c, item_d]
+    assert jesse.inventory == [item_e, item_f, item_a]
+    # *********************************************************************
+    # 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
+
+# @pytest.mark.skip
+def test_swap_newest_reordered():
+    # Arrange
+    item_a = Decor(age=2.0)
+    item_b = Electronics(age=4.0)
+    item_c = Decor(age=4.0)
+    tai = Vendor(
+        inventory=[item_c, item_b, item_a]
+    )
+
+    item_d = Clothing(age=2.0)
+    item_e = Decor(age=4.0)
+    item_f = Clothing(age=4.0)
+    jesse = Vendor(
+        inventory=[item_f, item_e, item_d]
+    )
+
+    # Act
+    result = tai.swap_by_newest(
+        other=jesse
+    )
+
+    # raise Exception("Complete this test according to comments below.")
+    # *********************************************************************
+    # ****** Complete Assert Portion of this test **********
+    assert result == True
+    assert len(tai.inventory) == 3
+    assert len(jesse.inventory) == 3
+    assert tai.inventory == [item_c, item_b, item_d]
+    assert jesse.inventory == [item_f, item_e, item_a]
+    # *********************************************************************
+    # 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_newest_no_inventory_is_false():
+    tai = Vendor(
+        inventory=[]
+    )
+
+    item_a = Clothing(age=2.0)
+    item_b = Decor(age=4.0)
+    item_c = Clothing(age=4.0)
+    jesse = Vendor(
+        inventory=[item_a, item_b, item_c]
+    )
+
+    result = tai.swap_by_newest(
+        other=jesse
+    )
+
+    assert not result
+    assert len(tai.inventory) == 0
+    assert len(jesse.inventory) == 3
+    assert item_a in jesse.inventory
+    assert item_b in jesse.inventory
+    assert item_c in jesse.inventory
+
+# @pytest.mark.skip
+def test_swap_newest_no_other_inventory_is_false():
+    item_a = Clothing(age=2.0)
+    item_b = Decor(age=4.0)
+    item_c = Clothing(age=4.0)
+    tai = Vendor(
+        inventory=[item_a, item_b, item_c]
+    )
+
+    jesse = Vendor(
+        inventory=[]
+    )
+
+    result = tai.swap_by_newest(
+        other=jesse
+    )
+
+    assert not result
+    assert len(tai.inventory) == 3
+    assert len(jesse.inventory) == 0
+    assert item_a in tai.inventory
+    assert item_b in tai.inventory
+    assert item_c in tai.inventory
\ No newline at end of file