diff --git a/Library/Homebrew/test/software_spec/bottle_spec.rb b/Library/Homebrew/test/software_spec/bottle_spec.rb
index 98aa029bcd..e6d8d9928a 100644
--- a/Library/Homebrew/test/software_spec/bottle_spec.rb
+++ b/Library/Homebrew/test/software_spec/bottle_spec.rb
@@ -1,62 +1,17 @@
 # frozen_string_literal: true
 
 require "software_spec"
+require "test/support/fixtures/testball_bottle"
 
-RSpec.describe BottleSpecification do
-  subject(:bottle_spec) { described_class.new }
+RSpec.describe Bottle do
+  describe "#filename" do
+    it "renders the bottle filename" do
+      bottle_spec = BottleSpecification.new
+      bottle_spec.sha256(arm64_big_sur: "deadbeef" * 8)
+      tag = Utils::Bottles::Tag.from_symbol :arm64_big_sur
+      bottle = described_class.new(TestballBottle.new, bottle_spec, tag)
 
-  describe "#sha256" do
-    it "works without cellar" do
-      checksums = {
-        arm64_big_sur: "deadbeef" * 8,
-        big_sur:       "faceb00c" * 8,
-        catalina:      "baadf00d" * 8,
-        mojave:        "8badf00d" * 8,
-      }
-
-      checksums.each_pair do |cat, digest|
-        bottle_spec.sha256(cat => digest)
-        tag_spec = bottle_spec.tag_specification_for(Utils::Bottles::Tag.from_symbol(cat))
-        expect(Checksum.new(digest)).to eq(tag_spec.checksum)
-      end
-    end
-
-    it "works with cellar" do
-      checksums = [
-        { cellar: :any_skip_relocation, tag: :arm64_big_sur,  digest: "deadbeef" * 8 },
-        { cellar: :any, tag: :big_sur, digest: "faceb00c" * 8 },
-        { cellar: "/usr/local/Cellar", tag: :catalina, digest: "baadf00d" * 8 },
-        { cellar: Homebrew::DEFAULT_CELLAR, tag: :mojave, digest: "8badf00d" * 8 },
-      ]
-
-      checksums.each do |checksum|
-        bottle_spec.sha256(cellar: checksum[:cellar], checksum[:tag] => checksum[:digest])
-        tag_spec = bottle_spec.tag_specification_for(Utils::Bottles::Tag.from_symbol(checksum[:tag]))
-        expect(Checksum.new(checksum[:digest])).to eq(tag_spec.checksum)
-        expect(checksum[:tag]).to eq(tag_spec.tag.to_sym)
-        checksum[:cellar] ||= Homebrew::DEFAULT_CELLAR
-        expect(checksum[:cellar]).to eq(tag_spec.cellar)
-      end
-    end
-  end
-
-  describe "#compatible_locations?" do
-    it "checks if the bottle cellar is relocatable" do
-      expect(bottle_spec.compatible_locations?).to be false
-    end
-  end
-
-  describe "#tag_to_cellar" do
-    it "returns the cellar for a tag" do
-      expect(bottle_spec.tag_to_cellar).to eq Utils::Bottles.tag.default_cellar
-    end
-  end
-
-  %w[root_url rebuild].each do |method|
-    specify "##{method}" do
-      object = Object.new
-      bottle_spec.public_send(method, object)
-      expect(bottle_spec.public_send(method)).to eq(object)
+      expect(bottle.filename.to_s).to eq("testball_bottle--0.1.arm64_big_sur.bottle.tar.gz")
     end
   end
 end
diff --git a/Library/Homebrew/test/software_spec/bottle_specification_spec.rb b/Library/Homebrew/test/software_spec/bottle_specification_spec.rb
new file mode 100644
index 0000000000..98aa029bcd
--- /dev/null
+++ b/Library/Homebrew/test/software_spec/bottle_specification_spec.rb
@@ -0,0 +1,62 @@
+# frozen_string_literal: true
+
+require "software_spec"
+
+RSpec.describe BottleSpecification do
+  subject(:bottle_spec) { described_class.new }
+
+  describe "#sha256" do
+    it "works without cellar" do
+      checksums = {
+        arm64_big_sur: "deadbeef" * 8,
+        big_sur:       "faceb00c" * 8,
+        catalina:      "baadf00d" * 8,
+        mojave:        "8badf00d" * 8,
+      }
+
+      checksums.each_pair do |cat, digest|
+        bottle_spec.sha256(cat => digest)
+        tag_spec = bottle_spec.tag_specification_for(Utils::Bottles::Tag.from_symbol(cat))
+        expect(Checksum.new(digest)).to eq(tag_spec.checksum)
+      end
+    end
+
+    it "works with cellar" do
+      checksums = [
+        { cellar: :any_skip_relocation, tag: :arm64_big_sur,  digest: "deadbeef" * 8 },
+        { cellar: :any, tag: :big_sur, digest: "faceb00c" * 8 },
+        { cellar: "/usr/local/Cellar", tag: :catalina, digest: "baadf00d" * 8 },
+        { cellar: Homebrew::DEFAULT_CELLAR, tag: :mojave, digest: "8badf00d" * 8 },
+      ]
+
+      checksums.each do |checksum|
+        bottle_spec.sha256(cellar: checksum[:cellar], checksum[:tag] => checksum[:digest])
+        tag_spec = bottle_spec.tag_specification_for(Utils::Bottles::Tag.from_symbol(checksum[:tag]))
+        expect(Checksum.new(checksum[:digest])).to eq(tag_spec.checksum)
+        expect(checksum[:tag]).to eq(tag_spec.tag.to_sym)
+        checksum[:cellar] ||= Homebrew::DEFAULT_CELLAR
+        expect(checksum[:cellar]).to eq(tag_spec.cellar)
+      end
+    end
+  end
+
+  describe "#compatible_locations?" do
+    it "checks if the bottle cellar is relocatable" do
+      expect(bottle_spec.compatible_locations?).to be false
+    end
+  end
+
+  describe "#tag_to_cellar" do
+    it "returns the cellar for a tag" do
+      expect(bottle_spec.tag_to_cellar).to eq Utils::Bottles.tag.default_cellar
+    end
+  end
+
+  %w[root_url rebuild].each do |method|
+    specify "##{method}" do
+      object = Object.new
+      bottle_spec.public_send(method, object)
+      expect(bottle_spec.public_send(method)).to eq(object)
+    end
+  end
+end