add some test

test/ex_doc/formatter/epub/templates_test.exs

@@ -38,7 +38,53 @@ defmodule ExDoc.Formatter.EPUB.TemplatesTest do
     :ok
   end
 
-  describe "module_page" do
+  describe "content_template/5" do
+    test "includes logo as a resource if specified in the config" do
+      nodes = %{modules: [], tasks: []}
+
+      content =
+        [logo: "my_logo.png"]
+        |> doc_config()
+        |> Templates.content_template(nodes, "uuid", "datetime", _static_files = [])
+
+      assert content =~ ~S|<item id="logo" href="assets/logo.png" media-type="image/png"/>|
+    end
+
+    test "includes cover as a resource if specified in the config" do
+      nodes = %{modules: [], tasks: []}
+
+      content =
+        [cover: "my_cover.svg"]
+        |> doc_config()
+        |> Templates.content_template(nodes, "uuid", "datetime", _static_files = [])
+
+      assert content =~ ~S|<meta name="cover" content="cover-image"/>|
+
+      assert content =~
+               ~S|<item id="cover-image" href="assets/cover.svg" media-type="image/svg+xml"/>|
+    end
+
+    test "includes modules as a resource" do
+      module_node = %ExDoc.ModuleNode{
+        module: XPTOModule,
+        doc: nil,
+        id: "XPTOModule",
+        title: "XPTOModule"
+      }
+
+      nodes = %{modules: [module_node], tasks: []}
+
+      content =
+        Templates.content_template(doc_config(), nodes, "uuid", "datetime", _static_files = [])
+
+      assert content =~
+               ~S|<item id="XPTOModule" href="XPTOModule.xhtml" media-type="application/xhtml+xml" properties="scripted"/>|
+
+      assert content =~ ~S|<itemref idref="XPTOModule"/>|
+    end
+  end
+
+  describe "module_page/2" do
     test "generates only the module name when there's no more info" do
       module_node = %ExDoc.ModuleNode{
         module: XPTOModule,