test: add spdx spec

Library/Homebrew/test/utils/spdx_spec.rb

@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+require "utils/spdx"
+
+describe SPDX do
+  describe ".spdx_data" do
+    it "has the license list version" do
+      expect(described_class.spdx_data["licenseListVersion"]).not_to eq(nil)
+    end
+
+    it "has the release date" do
+      expect(described_class.spdx_data["releaseDate"]).not_to eq(nil)
+    end
+
+    it "has licenses" do
+      expect(described_class.spdx_data["licenses"].length).not_to eq(0)
+    end
+  end
+
+  describe ".download_latest_license_data!", :needs_network do
+    let(:tmp_json_path) { Pathname.new("#{TEST_TMPDIR}/spdx.json") }
+
+    after do
+      FileUtils.rm tmp_json_path
+    end
+
+    it "downloads latest license data" do
+      described_class.download_latest_license_data! to: tmp_json_path
+      expect(tmp_json_path).to exist
+    end
+  end
+end

Library/Homebrew/utils/spdx.rb

@@ -12,9 +12,9 @@ module SPDX
     @spdx_data ||= JSON.parse(JSON_PATH.read)
   end
 
-  def download_latest_license_data!
+  def download_latest_license_data!(to: JSON_PATH)
     latest_tag = GitHub.open_api(API_URL)["tag_name"]
     data_url = "https://raw.githubusercontent.com/spdx/license-list-data/#{latest_tag}/json/licenses.json"
-    curl_download(data_url, to: JSON_PATH, partial: false)
+    curl_download(data_url, to: to, partial: false)
   end
 end