diff --git a/spec/fixtures/colors.yml b/spec/fixtures/colors.yml
index 2404832d..42589873 100644
--- a/spec/fixtures/colors.yml
+++ b/spec/fixtures/colors.yml
@@ -1,9 +1,18 @@
 blue:
   id: 8
   name: blue
+  basic: true
+green:
+  id: 34
+  name: green
+  basic: true
 purple:
   id: 57
   name: purple
+red:
+  id: 61
+  name: red
+  basic: true
 robot:
   id: 62
   name: robot
diff --git a/spec/fixtures/items.yml b/spec/fixtures/items.yml
new file mode 100644
index 00000000..f2d3e93c
--- /dev/null
+++ b/spec/fixtures/items.yml
@@ -0,0 +1,14 @@
+straw_hat:
+  id: 58
+  name: Straw Hat
+  description: "This straw hat will keep the sun out of your pets eyes in
+    bright sunlight."
+  thumbnail_url: https://images.neopets.com/items/straw-hat.gif
+  type: Clothes
+  category: Clothes
+  rarity: Very Rare
+  rarity_index: 90
+  price: 376
+  weight_lbs: 1
+  zones_restrict: 0000000000000000000000000001000000001010000000000000
+  species_support_ids: "35"
diff --git a/spec/models/item_spec.rb b/spec/models/item_spec.rb
new file mode 100644
index 00000000..b8434aae
--- /dev/null
+++ b/spec/models/item_spec.rb
@@ -0,0 +1,93 @@
+require_relative '../rails_helper'
+
+RSpec.describe Item do
+	fixtures :items, :colors, :species, :zones
+
+	context "modeling status:" do
+		# Rather than using fixtures of real-world data, we create very specific
+		# pet types, to be able to create small encapsulated test cases where there
+		# are only a few bodies.
+		before do
+			PetType.destroy_all # Make sure no leftovers from e.g. PetType's spec!
+			build_pt(colors(:blue),  species(:acara),    body_id: 1).save!
+			build_pt(colors(:red),   species(:acara),    body_id: 1).save!
+			build_pt(colors(:green), species(:blumaroo), body_id: 2).save!
+			build_pt(colors(:red),   species(:chia),     body_id: 3).save!
+		end
+
+		def build_pt(color, species, body_id:)
+			PetType.new(color:, species:, body_id:)
+		end
+
+		def build_item_asset(zone, body_id:)
+			@remote_id = (@remote_id || 0) + 1
+			@url = "https://images.neopets.example/#{@remote_id}.swf"
+			SwfAsset.new(type: "object", remote_id: @remote_id, url: @url,
+			             zones_restrict: "", zone:, body_id:)
+		end
+
+		describe "an item without any modeling data" do
+			subject(:item) { items(:straw_hat) }
+
+			pending("is not fully modeled") { should_not be_predicted_fully_modeled }
+			it("has no compatible body IDs") do
+				expect(item.compatible_body_ids).to be_empty
+			end
+			pending("predicts all standard bodies are compatible") do
+				expect(item.predicted_missing_body_ids).to contain_exactly(1, 2, 3)
+			end
+		end
+
+		describe "an item with one species modeled" do
+			subject(:item) { items(:straw_hat) }
+
+			before do
+				item.swf_assets << build_item_asset(zones(:wings), body_id: 1)
+			end
+
+			it("is considered fully modeled") { should be_predicted_fully_modeled }
+			it("has one compatible body ID") do
+				expect(item.compatible_body_ids).to contain_exactly(1)
+			end
+			it("predicts no more compatible bodies") do
+				expect(item.predicted_missing_body_ids).to be_empty
+			end
+		end
+
+		describe "an item with two species modeled" do
+			subject(:item) { items(:straw_hat) }
+
+			before do
+				item.swf_assets << build_item_asset(zones(:wings), body_id: 1)
+				item.swf_assets << build_item_asset(zones(:wings), body_id: 2)
+				# HACK: I don't understand why the first asset is triggering the hooks
+				#       for cached fields, but the second isn't? Idk, force an update.
+				item.update_cached_fields
+			end
+
+			it("is not fully modeled") { should_not be_predicted_fully_modeled }
+			it("has two compatible body IDs") do
+				expect(item.compatible_body_ids).to contain_exactly(1, 2)
+			end
+			it("predicts remaining standard bodies are compatible") do
+				expect(item.predicted_missing_body_ids).to contain_exactly(3)
+			end
+		end
+
+		describe "an item that fits all pets the same" do
+			subject(:item) { items(:straw_hat) }
+
+			before do
+				item.swf_assets << build_item_asset(zones(:background), body_id: 0)
+			end
+
+			it("is fully modeled") { should be_predicted_fully_modeled }
+			it("is compatible with all bodies (body ID = 0)") do
+				expect(item.compatible_body_ids).to contain_exactly(0)
+			end
+			it("predicts no more compatible bodies") do
+				expect(item.predicted_missing_body_ids).to be_empty
+			end
+		end
+	end
+end