validate json-ld with google structured data testing tool

spec/jekyll_seo_tag/json_ld_spec.rb

@@ -149,4 +149,22 @@ RSpec.describe Jekyll::SeoTag::JSONLD do
     expect(subject).to have_key("url")
     expect(subject["url"]).to eql("/page.html")
   end
+
+  context "validating" do
+    let(:html) do
+      "<script type=\"application/ld+json\">#{subject.to_json}</script>"
+    end
+    let(:image) { { "path" => "image", "height" => "100%", "width" => "10px" } }
+    let(:config) do
+      {
+        "logo"     => "logo",
+        "timezone" => "America/New_York",
+        "url"      => "http://example.com",
+      }
+    end
+
+    it "validates" do
+      expect(html).to be_valid_json_ld
+    end
+  end
 end

spec/spec_helper.rb

@@ -2,9 +2,31 @@ $LOAD_PATH.unshift File.expand_path("../../lib", __FILE__)
 require "jekyll"
 require "jekyll-seo-tag"
 require "html-proofer"
+require "uri"
+require "net/http"
 
 ENV["JEKYLL_LOG_LEVEL"] = "error"
 
+RSpec::Matchers.define :be_valid_json_ld do |_expected|
+  match do |actual|
+    validate_json_ld(actual)["errors"].empty?
+  end
+
+  failure_message do |actual|
+    validate_json_ld(actual)["errors"]
+  end
+
+  def validate_json_ld(html)
+    params = { "html" => html }
+    url = URI.parse("https://search.google.com/structured-data/testing-tool/validate")
+    response = Net::HTTP.post_form(url, params)
+    JSON.parse(response.body.split("\n")[1])
+  rescue
+    puts "Unable to validate JSON"
+    { "errors" => [] }
+  end
+end
+
 def dest_dir
   File.expand_path("../tmp/dest", File.dirname(__FILE__))
 end