1 files changed, 48 insertions, 0 deletions
diff --git a/spec/support/shared_examples/banzai/filters/inline_embeds_shared_examples.rb b/spec/support/shared_examples/banzai/filters/inline_embeds_shared_examples.rb
new file mode 100644
index 00000000000..599161abbfe
--- /dev/null
+++ b/spec/support/shared_examples/banzai/filters/inline_embeds_shared_examples.rb
@@ -0,0 +1,48 @@
+# frozen_string_literal: true
+
+# Expects 2 attributes to be defined:
+#   trigger_url - Url expected to trigger the insertion of a placeholder.
+#   dashboard_url - Url expected to be present in the placeholder.
+RSpec.shared_examples 'a metrics embed filter' do
+  let(:input) { %(<a href="#{url}">example</a>) }
+  let(:doc) { filter(input) }
+
+  context 'when the document has an external link' do
+    let(:url) { 'https://foo.com' }
+
+    it 'leaves regular non-metrics links unchanged' do
+      expect(doc.to_s).to eq(input)
+    end
+  end
+
+  context 'when the document contains an embeddable link' do
+    let(:url) { trigger_url }
+
+    it 'leaves the original link unchanged' do
+      expect(unescape(doc.at_css('a').to_s)).to eq(input)
+    end
+
+    it 'appends a metrics charts placeholder' do
+      node = doc.at_css('.js-render-metrics')
+      expect(node).to be_present
+
+      expect(node.attribute('data-dashboard-url').to_s).to eq(dashboard_url)
+    end
+
+    context 'in a paragraph' do
+      let(:paragraph) { %(This is an <a href="#{url}">example</a> of metrics.) }
+      let(:input) { %(<p>#{paragraph}</p>) }
+
+      it 'appends a metrics charts placeholder after the enclosing paragraph' do
+        expect(unescape(doc.at_css('p').to_s)).to include(paragraph)
+        expect(doc.at_css('.js-render-metrics')).to be_present
+      end
+    end
+  end
+
+  # Nokogiri escapes the URLs, but we don't care about that
+  # distinction for the purposes of these filters
+  def unescape(html)
+    CGI.unescapeHTML(html)
+  end
+end