initial commit

test/test_bis.py

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+from service.models.bis import BiS
+from service.models.piece import Piece
+from service.models.upgrade import Upgrade
+
+
+def test_set_item(bis: BiS, weapon: Piece) -> None:
+    bis.set_item(weapon)
+    assert bis.has_piece(weapon)
+
+
+def test_remove_item(bis: BiS, weapon: Piece) -> None:
+    test_set_item(bis, weapon)
+    bis.remove_item(weapon)
+    assert not bis.has_piece(weapon)
+
+
+def test_upgrades_required(bis: BiS, weapon: Piece, head_with_upgrade: Piece) -> None:
+    bis.set_item(weapon)
+    bis.set_item(head_with_upgrade)
+    assert bis.upgrades_required == {Upgrade.NoUpgrade: 1, Upgrade.GearUpgrade: 1}