Add specs for InstancePresenter (#9596)

spec/presenters/instance_presenter_spec.rb

@@ -111,4 +111,37 @@ describe InstancePresenter do
       expect(instance_presenter.domain_count).to eq(345)
     end
   end
+
+  describe '#version_number' do
+    it 'returns Mastodon::Version' do
+      expect(instance_presenter.version_number).to be(Mastodon::Version)
+    end
+  end
+
+  describe '#source_url' do
+    it 'returns "https://github.com/tootsuite/mastodon"' do
+      expect(instance_presenter.source_url).to eq('https://github.com/tootsuite/mastodon')
+    end
+  end
+
+  describe '#thumbnail' do
+    it 'returns SiteUpload' do
+      thumbnail = Fabricate(:site_upload, var: 'thumbnail')
+      expect(instance_presenter.thumbnail).to eq(thumbnail)
+    end
+  end
+
+  describe '#hero' do
+    it 'returns SiteUpload' do
+      hero = Fabricate(:site_upload, var: 'hero')
+      expect(instance_presenter.hero).to eq(hero)
+    end
+  end
+
+  describe '#mascot' do
+    it 'returns SiteUpload' do
+      mascot = Fabricate(:site_upload, var: 'mascot')
+      expect(instance_presenter.mascot).to eq(mascot)
+    end
+  end
 end