test(checkbox): test multiple checkbox reactivity

tests/Checkbox/MultipleCheckboxes.test.svelte

@@ -0,0 +1,28 @@
+<script lang="ts">
+  import { Checkbox, Button } from "carbon-components-svelte";
+
+  export let values = ["Apple", "Banana", "Coconut"];
+  export let group = values.slice(0, 2);
+
+  $: console.log("group changed:", group);
+</script>
+
+{#each values as value, index}
+  <Checkbox
+    bind:group
+    labelText={value}
+    {value}
+    data-testid={`checkbox-${index}`}
+  />
+{/each}
+
+<Button
+  on:click={() => {
+    group = ["Banana"];
+    console.log("set to banana");
+  }}
+>
+  Set to ["Banana"]
+</Button>
+
+<span data-testid="selected-values">{JSON.stringify(group)}</span>