test(tabs): add more unit tests (#2201)

tests/Tabs/Tab.test.svelte

@@ -0,0 +1,16 @@
+<script lang="ts">
+  import { Tabs, Tab } from "carbon-components-svelte";
+
+  export let label = "Test Tab";
+  export let href = "#test";
+  export let disabled = false;
+  export let tabindex = "0";
+  export let id = "test-tab";
+</script>
+
+<Tabs>
+  <Tab {label} {href} {disabled} {tabindex} {id} />
+  <svelte:fragment slot="content">
+    <div>Test Content</div>
+  </svelte:fragment>
+</Tabs>

tests/Tabs/Tabs.test.ts

@@ -1,6 +1,8 @@
 import { render, screen } from "@testing-library/svelte";
 import { user } from "../setup-tests";
 import Tabs from "./Tabs.test.svelte";
+import Tab from "./Tab.test.svelte";
+import TabsSkeleton from "./TabsSkeleton.test.svelte";
 
 describe("Tabs", () => {
   let consoleLog: ReturnType<typeof vi.spyOn>;
@@ -127,3 +129,172 @@ describe("Tabs", () => {
     expect(screen.getByTitle("Custom description")).toBeInTheDocument();
   });
 });
+
+describe("Tab", () => {
+  it("should render with default props", () => {
+    render(Tab);
+
+    const tab = screen.getByRole("tab", { name: "Test Tab" });
+    expect(tab).toBeInTheDocument();
+    expect(tab).toHaveAttribute("href", "#test");
+    expect(tab).toHaveAttribute("tabindex", "0");
+    expect(tab).toHaveAttribute("id", "test-tab");
+  });
+
+  it("should render with custom label", () => {
+    render(Tab, { props: { label: "Custom Label" } });
+
+    expect(
+      screen.getByRole("tab", { name: "Custom Label" }),
+    ).toBeInTheDocument();
+  });
+
+  it("should render with custom href", () => {
+    render(Tab, { props: { href: "/custom" } });
+
+    const tab = screen.getByRole("tab");
+    expect(tab).toHaveAttribute("href", "/custom");
+  });
+
+  it("should handle disabled state", () => {
+    render(Tab, { props: { disabled: true } });
+
+    const tab = screen.getByRole("tab");
+    expect(tab).toHaveAttribute("aria-disabled", "true");
+    expect(tab).toHaveAttribute("tabindex", "-1");
+  });
+
+  it("should handle custom tabindex", () => {
+    render(Tab, { props: { tabindex: "1" } });
+
+    const tab = screen.getByRole("tab");
+    expect(tab).toHaveAttribute("tabindex", "1");
+  });
+
+  it("should handle custom id", () => {
+    render(Tab, { props: { id: "custom-id" } });
+
+    const tab = screen.getByRole("tab");
+    expect(tab).toHaveAttribute("id", "custom-id");
+  });
+
+  it("should be clickable when enabled", async () => {
+    render(Tab);
+
+    const tab = screen.getByRole("tab");
+    await user.click(tab);
+
+    expect(tab).toHaveAttribute("aria-selected", "true");
+  });
+
+  it("should handle keyboard navigation with arrow keys", async () => {
+    render(Tab);
+
+    const tab = screen.getByRole("tab");
+    await user.click(tab);
+    await user.keyboard("{ArrowRight}");
+
+    expect(tab).toHaveFocus();
+  });
+
+  it("should handle space key activation", async () => {
+    render(Tab);
+
+    const tab = screen.getByRole("tab");
+    await user.click(tab);
+    await user.keyboard(" ");
+
+    expect(tab).toHaveAttribute("aria-selected", "true");
+  });
+
+  it("should handle enter key activation", async () => {
+    render(Tab);
+
+    const tab = screen.getByRole("tab");
+    await user.click(tab);
+    await user.keyboard("{Enter}");
+
+    expect(tab).toHaveAttribute("aria-selected", "true");
+  });
+
+  it("should render slot content when no label provided", () => {
+    render(Tab, { props: { label: "" } });
+
+    const tab = screen.getByRole("tab");
+    expect(tab).toHaveTextContent("");
+  });
+});
+
+describe("TabsSkeleton", () => {
+  it("should render with default props", () => {
+    const { container } = render(TabsSkeleton);
+
+    const skeleton = container.querySelector(".bx--tabs");
+    expect(skeleton).toBeInTheDocument();
+    expect(skeleton).toHaveClass("bx--skeleton");
+    expect(skeleton).toHaveClass("bx--tabs--scrollable");
+
+    const navItems = container.querySelectorAll(
+      ".bx--tabs--scrollable__nav-item",
+    );
+    expect(navItems).toHaveLength(4);
+  });
+
+  it("should render with custom count", () => {
+    const { container } = render(TabsSkeleton, { props: { count: 6 } });
+
+    const navItems = container.querySelectorAll(
+      ".bx--tabs--scrollable__nav-item",
+    );
+    expect(navItems).toHaveLength(6);
+  });
+
+  it("should render with container type", () => {
+    const { container } = render(TabsSkeleton, {
+      props: { type: "container" },
+    });
+
+    const skeleton = container.querySelector(".bx--tabs");
+    expect(skeleton).toHaveClass("bx--tabs--scrollable--container");
+  });
+
+  it("should render with default type", () => {
+    const { container } = render(TabsSkeleton, { props: { type: "default" } });
+
+    const skeleton = container.querySelector(".bx--tabs");
+    expect(skeleton).not.toHaveClass("bx--tabs--scrollable--container");
+  });
+
+  it("should render skeleton nav items with correct structure", () => {
+    const { container } = render(TabsSkeleton);
+
+    const navItems = container.querySelectorAll(
+      ".bx--tabs--scrollable__nav-item",
+    );
+    navItems.forEach((item) => {
+      const link = item.querySelector(".bx--tabs__nav-link");
+      const span = link?.querySelector("span");
+
+      expect(link).toBeInTheDocument();
+      expect(span).toBeInTheDocument();
+    });
+  });
+
+  it("should handle zero count", () => {
+    const { container } = render(TabsSkeleton, { props: { count: 0 } });
+
+    const navItems = container.querySelectorAll(
+      ".bx--tabs--scrollable__nav-item",
+    );
+    expect(navItems).toHaveLength(0);
+  });
+
+  it("should handle large count", () => {
+    const { container } = render(TabsSkeleton, { props: { count: 20 } });
+
+    const navItems = container.querySelectorAll(
+      ".bx--tabs--scrollable__nav-item",
+    );
+    expect(navItems).toHaveLength(20);
+  });
+});

tests/Tabs/TabsSkeleton.test.svelte

@@ -0,0 +1,8 @@
+<script lang="ts">
+  import { TabsSkeleton } from "carbon-components-svelte";
+
+  export let count = 4;
+  export let type: "default" | "container" = "default";
+</script>
+
+<TabsSkeleton {count} {type} />