performance upgrade

test/luma_markdown_test.gleam

@@ -1,4 +1,6 @@
 import gleeunit
+import helpers
+import luma_markdown
 
 pub fn main() -> Nil {
   gleeunit.main()
@@ -11,3 +13,10 @@ pub fn hello_world_test() {
 
   assert greeting == "Hello, Joe!"
 }
+
+pub fn renders_plain_and_marked_lines_test() {
+  let information = helpers.Information(1, 1)
+
+  assert luma_markdown.luma_markdown(information, "  plain text  \n!2 marked")
+    == "plain text\n**marked"
+}