1 files changed, 26 insertions, 0 deletions
diff --git a/Library/Homebrew/test/requirements_spec.rb b/Library/Homebrew/test/requirements_spec.rb
new file mode 100644
index 000000000..3111a7c9c
--- /dev/null
+++ b/Library/Homebrew/test/requirements_spec.rb
@@ -0,0 +1,26 @@
+require "requirements"
+
+describe Requirements do
+  describe "#<<" do
+    it "returns itself" do
+      expect(subject << Object.new).to be(subject)
+    end
+
+    it "merges duplicate requirements" do
+      subject << X11Requirement.new << X11Requirement.new
+      expect(subject.count).to eq(1)
+      subject << Requirement.new
+      expect(subject.count).to eq(2)
+    end
+
+    it "prefers the larger requirement when merging duplicates" do
+      subject << X11Requirement.new << X11Requirement.new("x11", %w[2.6])
+      expect(subject.to_a).to eq([X11Requirement.new("x11", %w[2.6])])
+    end
+
+    it "does not use the smaller requirement when merging duplicates" do
+      subject << X11Requirement.new("x11", %w[2.6]) << X11Requirement.new
+      expect(subject.to_a).to eq([X11Requirement.new("x11", %w[2.6])])
+    end
+  end
+end