diff --git a/Library/Homebrew/test/dev-cmd/determine-test-runners_spec.rb b/Library/Homebrew/test/dev-cmd/determine-test-runners_spec.rb
index 520035f741..fafcb7a18d 100644
--- a/Library/Homebrew/test/dev-cmd/determine-test-runners_spec.rb
+++ b/Library/Homebrew/test/dev-cmd/determine-test-runners_spec.rb
@@ -158,6 +158,7 @@ describe "brew determine-test-runners" do
 
     expect(File.read(github_output)).not_to be_empty
     expect(get_runners(github_output)).to eq(["13", "13-arm64", linux_runner])
+    expect(get_runners(github_output)).not_to eq(all_runners)
   end
 end