diff --git a/Library/Homebrew/test/cask/artifact/abstract_artifact_spec.rb b/Library/Homebrew/test/cask/artifact/abstract_artifact_spec.rb
index 1c86058b11..24e35e969d 100644
--- a/Library/Homebrew/test/cask/artifact/abstract_artifact_spec.rb
+++ b/Library/Homebrew/test/cask/artifact/abstract_artifact_spec.rb
@@ -3,24 +3,23 @@
 
 describe Cask::Artifact::AbstractArtifact, :cask do
   describe ".read_script_arguments" do
+    let(:stanza) { :installer }
+
     it "accepts a string, and uses it as the executable" do
       arguments = "something"
-      stanza = :installer
 
       expect(described_class.read_script_arguments(arguments, stanza)).to eq(["something", {}])
     end
 
     it "accepts a hash with an executable" do
       arguments = { executable: "something" }
-      stanza = :installer
 
       expect(described_class.read_script_arguments(arguments, stanza)).to eq(["something", {}])
     end
 
-    it "does not mutate the arguments in place" do
-      arguments = { executable: "something", foo: "bar" }
+    it "does not mutate the original arguments in place" do
+      arguments = { executable: "something" }
       clone = arguments.dup
-      stanza = :installer
 
       described_class.read_script_arguments(arguments, stanza)