test/version_spec: add special token comparison examples

Library/Homebrew/test/version_spec.rb

@@ -16,6 +16,28 @@ describe Version::Token do
   specify "#to_s" do
     expect(described_class.new("foo").to_s).to eq("foo")
   end
+
+  it "can be compared against nil" do
+    expect(described_class.create("2")).to be > nil
+    expect(described_class.create("p194")).to be > nil
+  end
+
+  it "can be compared against Version::NULL_TOKEN" do
+    expect(described_class.create("2")).to be > Version::NULL_TOKEN
+    expect(described_class.create("p194")).to be > Version::NULL_TOKEN
+  end
+
+  it "can be compared against strings" do
+    expect(described_class.create("2")).to be == "2"
+    expect(described_class.create("p194")).to be == "p194"
+    expect(described_class.create("1")).to be == 1
+  end
+
+  specify "comparison returns nil for non-token" do
+    v = described_class.create("1")
+    expect(v <=> Object.new).to be nil
+    expect { v > Object.new }.to raise_error(ArgumentError)
+  end
 end
 
 describe Version::NULL do