test: add TS types

tests/HiddenCodeSnippet.test.svelte

@@ -0,0 +1,34 @@
+<script lang="ts">
+  import { ToggleSmall, CodeSnippet } from "../types";
+
+  let toggled = false;
+
+  const code = Array.from({ length: 20 }, (_, i) => i + 1).join("\n");
+</script>
+
+<style>
+  .hidden {
+    display: none;
+  }
+</style>
+
+<ToggleSmall
+  style="margin-bottom: var(--cds-spacing-05)"
+  labelText="Show code snippets"
+  bind:toggled
+/>
+
+{#if toggled}
+  <h5>"Show more" will not render</h5><br />
+{/if}
+<div class:hidden="{!toggled}">
+  <CodeSnippet type="multi" code="{code}" />
+</div>
+
+{#if toggled}
+  <br /><br />
+  <h5>"Show more" will render</h5><br />
+  <div class:hidden="{!toggled}">
+    <CodeSnippet type="multi" code="{code}" />
+  </div>
+{/if}