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diff --git a/test/nested.gleam b/test/nested.gleam
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+// IMPORTS ---------------------------------------------------------------------
+
+import counter
+import gleam/list
+import gleam/map.{Map}
+import lustre
+import lustre/element.{Element, div}
+
+// MAIN ------------------------------------------------------------------------
+
+pub fn main() {
+  // A `simple` lustre application doesn't produce `Cmd`s. These are best to 
+  // start with if you're just getting started with lustre or you know you don't
+  // need the runtime to manage any side effects.
+  let app = lustre.simple(init, update, render)
+  let assert Ok(dispatch) = lustre.start(app, "body")
+
+  Nil
+}
+
+// MODEL -----------------------------------------------------------------------
+
+type Model =
+  Map(Int, counter.Model)
+
+fn init() -> Model {
+  use counters, id <- list.fold(list.range(1, 10), map.new())
+
+  map.insert(counters, id, counter.init())
+}
+
+// UPDATE ----------------------------------------------------------------------
+
+type Msg =
+  #(Int, counter.Msg)
+
+fn update(model: Model, msg: Msg) -> Model {
+  let #(id, counter_msg) = msg
+  let assert Ok(counter) = map.get(model, id)
+
+  map.insert(model, id, counter.update(counter, counter_msg))
+}
+
+// RENDER ----------------------------------------------------------------------
+
+fn render(model: Model) -> Element(Msg) {
+  div(
+    [],
+    {
+      use #(id, counter) <- list.map(map.to_list(model))
+      let tagger = fn(msg) { #(id, msg) }
+
+      element.map(counter.render(counter), tagger)
+    },
+  )
+}