test(radio-tile): add unit tests

tests/RadioTile/RadioTile.group.test.svelte

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+<script lang="ts">
+  import { TileGroup, RadioTile, Button } from "carbon-components-svelte";
+
+  const values = ["Lite plan", "Standard plan", "Plus plan"];
+
+  let selected = values[1];
+</script>
+
+<TileGroup legend="Service pricing tiers" name="plan" bind:selected>
+  {#each values as value}
+    <RadioTile {value}>{value}</RadioTile>
+  {/each}
+</TileGroup>
+
+<div>
+  Selected: {selected}
+</div>
+
+<Button
+  size="small"
+  disabled={selected === values[1]}
+  on:click={() => (selected = values[1])}
+>
+  Set to "{values[1]}"
+</Button>

tests/RadioTile/RadioTile.single.test.svelte

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+<script lang="ts">
+  import { RadioTile } from "carbon-components-svelte";
+</script>
+
+<RadioTile name="custom-name" value="test">
+  <div>Custom content</div>
+</RadioTile>

tests/RadioTile/RadioTile.test.svelte

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+<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>

tests/RadioTile/RadioTile.test.ts

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+import { render, screen } from "@testing-library/svelte";
+import { user } from "../setup-tests";
+import RadioTile from "./RadioTile.test.svelte";
+import RadioTileCustom from "./RadioTileCustom.test.svelte";
+import RadioTileSingle from "./RadioTile.single.test.svelte";
+import RadioTileGroup from "./RadioTile.group.test.svelte";
+
+describe("RadioTile", () => {
+  it("should render with default props", () => {
+    render(RadioTile);
+
+    const input = screen.getByRole("radio");
+    expect(input).toBeInTheDocument();
+    expect(input).toHaveAttribute("name", "test-group");
+    expect(input).toHaveAttribute("value", "test");
+    expect(input).not.toBeChecked();
+    expect(screen.getByText("Test content")).toBeInTheDocument();
+    expect(screen.getByTitle("Tile checkmark")).toBeInTheDocument();
+  });
+
+  it("should handle checked state", () => {
+    render(RadioTile, {
+      props: { checked: true },
+    });
+
+    const input = screen.getByRole("radio");
+    expect(input).toBeChecked();
+    expect(screen.getByText("Test content").closest(".bx--tile")).toHaveClass(
+      "bx--tile--is-selected",
+    );
+  });
+
+  it("should handle light variant", () => {
+    render(RadioTile, {
+      props: { light: true },
+    });
+
+    expect(screen.getByText("Test content").closest(".bx--tile")).toHaveClass(
+      "bx--tile--light",
+    );
+  });
+
+  it("should handle disabled state", () => {
+    render(RadioTile, {
+      props: { disabled: true },
+    });
+
+    const input = screen.getByRole("radio");
+    expect(input).toBeDisabled();
+    expect(screen.getByText("Test content").closest(".bx--tile")).toHaveClass(
+      "bx--tile--disabled",
+    );
+  });
+
+  it("should handle required state", () => {
+    render(RadioTile, {
+      props: { required: true },
+    });
+
+    expect(screen.getByRole("radio")).toHaveAttribute("required");
+  });
+
+  it("should handle custom value", () => {
+    render(RadioTile, {
+      props: { value: "custom-value" },
+    });
+
+    expect(screen.getByRole("radio")).toHaveAttribute("value", "custom-value");
+  });
+
+  it("should handle custom tabindex", () => {
+    render(RadioTile, {
+      props: { tabindex: "1" },
+    });
+
+    expect(screen.getByRole("radio")).toHaveAttribute("tabindex", "1");
+  });
+
+  it("should handle custom icon description", () => {
+    render(RadioTile, {
+      props: { iconDescription: "Custom checkmark" },
+    });
+
+    expect(screen.getByTitle("Custom checkmark")).toBeInTheDocument();
+  });
+
+  it("should handle custom id", () => {
+    render(RadioTile, { props: { id: "custom-id" } });
+
+    expect(screen.getByRole("radio")).toHaveAttribute("id", "custom-id");
+
+    const radioTileLabel = screen.getByText("Test content").closest("label");
+    assert(radioTileLabel);
+    expect(radioTileLabel).toHaveAttribute("for", "custom-id");
+  });
+
+  // TODO(bug): support standalone radio tile.
+  it.skip("should handle custom name", () => {
+    render(RadioTileSingle);
+
+    expect(screen.getByRole("radio")).toHaveAttribute("name", "custom-name");
+  });
+
+  it("should handle custom slots", () => {
+    render(RadioTileCustom);
+
+    expect(screen.getByText("Custom content")).toBeInTheDocument();
+  });
+
+  it("should handle change event", async () => {
+    const consoleLog = vi.spyOn(console, "log");
+    render(RadioTile);
+
+    const input = screen.getByRole("radio");
+    await user.click(input);
+
+    expect(input).toBeChecked();
+    expect(consoleLog).toHaveBeenCalledWith("change");
+  });
+
+  it("should handle keyboard events", async () => {
+    render(RadioTileGroup);
+
+    const inputs = screen.getAllByRole("radio");
+
+    expect(inputs[1]).not.toHaveFocus();
+    expect(inputs[1]).toBeChecked();
+
+    await user.tab();
+    expect(inputs[1]).toHaveFocus();
+
+    await user.keyboard("{ArrowDown}");
+    expect(inputs[2]).toHaveFocus();
+    expect(inputs[2]).toBeChecked();
+
+    await user.keyboard("{ArrowDown}");
+    expect(inputs[0]).toHaveFocus();
+    expect(inputs[0]).toBeChecked();
+  });
+
+  it("supports programmatic selection", async () => {
+    render(RadioTileGroup);
+
+    const inputs = screen.getAllByRole("radio");
+    expect(inputs[1]).not.toHaveFocus();
+    expect(inputs[1]).toBeChecked();
+    expect(screen.getByText(/Selected: Standard plan/)).toBeInTheDocument();
+
+    await user.click(inputs[2]);
+    expect(inputs[2]).toHaveFocus();
+    expect(inputs[2]).toBeChecked();
+    expect(screen.getByText(/Selected: Plus plan/)).toBeInTheDocument();
+
+    await user.click(screen.getByRole("button"));
+    expect(inputs[1]).not.toHaveFocus();
+    expect(inputs[1]).toBeChecked();
+    expect(screen.getByText(/Selected: Standard plan/)).toBeInTheDocument();
+  });
+
+  it("should handle disabled state with events", async () => {
+    render(RadioTile, {
+      props: { disabled: true },
+    });
+
+    const input = screen.getByRole("radio");
+    await user.click(input);
+    expect(input).not.toBeChecked();
+  });
+
+  it("should handle mouse events", async () => {
+    render(RadioTile);
+
+    const tile = screen.getByText("Test content").closest(".bx--tile");
+    assert(tile);
+    await user.hover(tile);
+    await user.unhover(tile);
+  });
+
+  it("should handle custom content slot", () => {
+    render(RadioTileCustom);
+
+    const content = screen.getByText("Custom content");
+    expect(content).toBeInTheDocument();
+    expect(content.tagName).toBe("DIV");
+  });
+
+  it("should handle TileGroup context", () => {
+    render(RadioTile, { props: { checked: true } });
+
+    const input = screen.getByRole("radio");
+    expect(input).toBeChecked();
+    expect(screen.getByText("Test content").closest(".bx--tile")).toHaveClass(
+      "bx--tile--is-selected",
+    );
+    expect(input).toHaveAttribute("name", "test-group");
+  });
+});

tests/RadioTile/RadioTileCustom.test.svelte

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+<script lang="ts">
+  import { RadioTile, TileGroup } from "carbon-components-svelte";
+</script>
+
+<TileGroup legend="Test group" name="test-group" selected="test">
+  <RadioTile value="test">
+    <div>Custom content</div>
+  </RadioTile>
+</TileGroup>