test(tile): add unit tests

tests/Tile/Tile.test.svelte

@@ -0,0 +1,20 @@
+<script lang="ts">
+  import { Tile } from "carbon-components-svelte";
+</script>
+
+<Tile>Default tile</Tile>
+
+<Tile light>Light variant</Tile>
+
+<Tile
+  data-testid="click-test"
+  on:click={() => {
+    console.log("clicked");
+  }}
+>
+  Clickable tile
+</Tile>
+
+<Tile data-testid="attr-test" title="Custom title" class="custom-class">
+  Custom attributes
+</Tile>

tests/Tile/Tile.test.ts

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+import { render, screen } from "@testing-library/svelte";
+import { user } from "../setup-tests";
+import Tile from "./Tile.test.svelte";
+
+describe("Tile", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("should render with default class", () => {
+    render(Tile);
+
+    const tile = screen.getByText("Default tile");
+    expect(tile).toHaveClass("bx--tile");
+  });
+
+  it("should render light variant", () => {
+    render(Tile);
+
+    const lightTile = screen.getByText("Light variant");
+    expect(lightTile).toHaveClass("bx--tile", "bx--tile--light");
+  });
+
+  it("should handle click events", async () => {
+    const consoleLog = vi.spyOn(console, "log");
+    render(Tile);
+
+    const tile = screen.getByTestId("click-test");
+    await user.click(tile);
+    expect(consoleLog).toHaveBeenCalledWith("clicked");
+    expect(consoleLog).toHaveBeenCalledTimes(1);
+  });
+
+  it("should pass through additional attributes", () => {
+    render(Tile);
+
+    const tile = screen.getByTestId("attr-test");
+    expect(tile).toHaveAttribute("title", "Custom title");
+    expect(tile).toHaveClass("custom-class");
+  });
+});