tests: add missing controller tests.

test/functional/dtext_links_controller_test.rb

@@ -0,0 +1,12 @@
+require "test_helper"
+
+class DtextLinksControllerTest < ActionDispatch::IntegrationTest
+  context "index action" do
+    should "work" do
+      @user = create(:user)
+      @wiki = as(@user) { create(:wiki_page, body: "[[test]]") }
+      get dtext_links_path
+      assert_response :success
+    end
+  end
+end