test(radio-tile): add unit tests

tests/RadioTile/RadioTile.test.svelte

@@ -0,0 +1,43 @@
+<script lang="ts">
+  import { RadioTile, TileGroup } from "carbon-components-svelte";
+  import type { ComponentProps } from "svelte";
+
+  export let checked: ComponentProps<RadioTile>["checked"] = false;
+  export let light: ComponentProps<RadioTile>["light"] = false;
+  export let disabled: ComponentProps<RadioTile>["disabled"] = false;
+  export let required: ComponentProps<RadioTile>["required"] = false;
+  export let value: ComponentProps<RadioTile>["value"] = "test";
+  export let tabindex: ComponentProps<RadioTile>["tabindex"] = "0";
+  export let iconDescription: ComponentProps<RadioTile>["iconDescription"] =
+    "Tile checkmark";
+  export let id: ComponentProps<RadioTile>["id"] = "ccs-test";
+  export let name: ComponentProps<RadioTile>["name"] = "test-group";
+</script>
+
+<TileGroup
+  legend="Test group"
+  name="test-group"
+  selected={checked ? value : undefined}
+>
+  <RadioTile
+    {checked}
+    {light}
+    {disabled}
+    {required}
+    {value}
+    {tabindex}
+    {iconDescription}
+    {id}
+    {name}
+    on:change={() => {
+      console.log("change");
+    }}
+    on:keydown
+    on:click
+    on:mouseover
+    on:mouseenter
+    on:mouseleave
+  >
+    Test content
+  </RadioTile>
+</TileGroup>