Adds missing spec files

spec/app/finders/users/yoast_seo_author_sitemap_spec.rb

@@ -0,0 +1,48 @@
+require 'spec_helper'
+
+describe WPScan::Finders::Users::YoastSeoAuthorSitemap do
+  subject(:finder) { described_class.new(target) }
+  let(:target)     { WPScan::Target.new(url) }
+  let(:url)        { 'http://wp.lab/' }
+  let(:fixtures)   { FINDERS_FIXTURES.join('users', 'yoast_seo_author_sitemap') }
+
+  describe '#aggressive' do
+    before do
+      allow(target).to receive(:sub_dir).and_return(false)
+
+      stub_request(:get, finder.sitemap_url).to_return(body: body)
+    end
+
+    context 'when not an XML response' do
+      let(:body) { '' }
+
+      its(:aggressive) { should eql([]) }
+    end
+
+    context 'when an XML response' do
+      context 'when no usernames disclosed' do
+        let(:body) { File.read(fixtures.join('no_usernames.xml')) }
+
+        its(:aggressive) { should eql([]) }
+      end
+
+      context 'when usernames disclosed' do
+        let(:body) { File.read(fixtures.join('usernames.xml')) }
+
+        it 'returns the expected array of users' do
+          users = finder.aggressive
+
+          expect(users.size).to eql 2
+
+          expect(users.first.username).to eql 'editor'
+          expect(users.first.confidence).to eql 100
+          expect(users.first.interesting_entries).to eql ['http://wp.lab/author-sitemap.xml']
+
+          expect(users.last.username).to eql 'admin'
+          expect(users.last.confidence).to eql 100
+          expect(users.last.interesting_entries).to eql ['http://wp.lab/author-sitemap.xml']
+        end
+      end
+    end
+  end
+end