add pretty-text tests for discourse-details plugin

plugins/discourse-details/spec/components/pretty_text_spec.rb

@@ -0,0 +1,12 @@
+require 'rails_helper'
+require 'pretty_text'
+
+describe PrettyText do
+
+  it "supports details tag" do
+    cooked_html = "<details><summary>foo</summary>\n\n<p>bar</p>\n\n<p></p></details>"
+    expect(PrettyText.cook("<details><summary>foo</summary>bar</details>")).to match_html(cooked_html)
+    expect(PrettyText.cook("[details=foo]bar[/details]")).to match_html(cooked_html)
+  end
+
+end