Add test/archive_spec.rb

Library/Homebrew/test/archive_spec.rb

@@ -0,0 +1,20 @@
+# typed: false
+# frozen_string_literal: true
+
+require "archive"
+
+describe Archive, :needs_network do
+  subject(:archive) { described_class.new(item: "homebrew") }
+
+  describe "::remote_checksum" do
+    it "detects a published file" do
+      hash = archive.remote_md5(directory: ".", remote_file: "cmake-3.1.2.yosemite.bottle.tar.gz")
+      expect(hash).to eq("c6e525d472124670b0b635800488f438")
+    end
+
+    it "fails on a non-existent file" do
+      hash = archive.remote_md5(directory: "bottles", remote_file: "my-fake-bottle-1.0.snow_hyena.tar.gz")
+      expect(hash).to be nil
+    end
+  end
+end