test(selectable-tile): add unit tests

tests/Tile/SelectableTile.test.svelte

@@ -0,0 +1,30 @@
+<script lang="ts">
+  import { SelectableTile } from "carbon-components-svelte";
+
+  export let selected = false;
+  export let light = false;
+  export let disabled = false;
+  export let title = "Test Tile";
+  export let value = "test-value";
+  export let name = "test-name";
+  export let iconDescription = "Test checkmark";
+</script>
+
+<SelectableTile
+  data-testid="selectable-tile"
+  {selected}
+  {light}
+  {disabled}
+  {title}
+  {value}
+  {name}
+  {iconDescription}
+  on:select={(e) => {
+    console.log("select", e.detail);
+  }}
+  on:deselect={(e) => {
+    console.log("deselect", e.detail);
+  }}
+>
+  Test Tile Content
+</SelectableTile>