1 files changed, 29 insertions, 0 deletions
diff --git a/Library/Homebrew/test/utils_spec.rb b/Library/Homebrew/test/utils_spec.rb
index 37bd83c4f..3b5355b15 100644
--- a/Library/Homebrew/test/utils_spec.rb
+++ b/Library/Homebrew/test/utils_spec.rb
@@ -296,4 +296,33 @@ describe "globally-scoped helper methods" do
       expect(ENV["PATH"]).not_to eq("/bin")
     end
   end
+
+  describe "#tap_and_name_comparison" do
+    describe "both strings are only names" do
+      it "alphabetizes the strings" do
+        expect(%w[a b].sort(&tap_and_name_comparison)).to eq(%w[a b])
+        expect(%w[b a].sort(&tap_and_name_comparison)).to eq(%w[a b])
+      end
+    end
+
+    describe "both strings include tap" do
+      it "alphabetizes the strings" do
+        expect(%w[a/z/z b/z/z].sort(&tap_and_name_comparison)).to eq(%w[a/z/z b/z/z])
+        expect(%w[b/z/z a/z/z].sort(&tap_and_name_comparison)).to eq(%w[a/z/z b/z/z])
+
+        expect(%w[z/a/z z/b/z].sort(&tap_and_name_comparison)).to eq(%w[z/a/z z/b/z])
+        expect(%w[z/b/z z/a/z].sort(&tap_and_name_comparison)).to eq(%w[z/a/z z/b/z])
+
+        expect(%w[z/z/a z/z/b].sort(&tap_and_name_comparison)).to eq(%w[z/z/a z/z/b])
+        expect(%w[z/z/b z/z/a].sort(&tap_and_name_comparison)).to eq(%w[z/z/a z/z/b])
+      end
+    end
+
+    describe "only one string includes tap" do
+      it "prefers the string without tap" do
+        expect(%w[a/z/z z].sort(&tap_and_name_comparison)).to eq(%w[z a/z/z])
+        expect(%w[z a/z/z].sort(&tap_and_name_comparison)).to eq(%w[z a/z/z])
+      end
+    end
+  end
 end