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244/**
* next/link shim unit tests.
*
* Mirrors test cases from Next.js test/unit/link-rendering.test.ts and
* test/unit/link-warnings.test.tsx, plus additional coverage for vinext's
* Link internals: resolveHref(), withBasePath(), applyLocaleToHref(), and
* isHashOnlyChange().
*
* These tests verify SSR output matches Next.js expectations and that
* pure helper functions work correctly.
*/
import { describe, it, expect } from "vitest";
import React from "react";
import ReactDOMServer from "react-dom/server";
// We test the Link component and its internal helpers.
// Link is a "use client" component but renderToString still works for SSR output.
import Link, { useLinkStatus } from "../packages/vinext/src/shims/link.js";
// Internal helpers re-exported or accessible via the router shim
import { isExternalUrl, isHashOnlyChange } from "../packages/vinext/src/shims/router.js";
// ─── SSR rendering (mirrors Next.js test/unit/link-rendering.test.ts) ────
describe("Link rendering", () => {
it("should render Link on its own", () => {
// Next.js test: <Link href="/my-path">to another page</Link>
// Expected: <a href="/my-path">to another page</a>
const html = ReactDOMServer.renderToString(
React.createElement(Link, { href: "/my-path" }, "to another page"),
);
expect(html).toContain('href="/my-path"');
expect(html).toContain("to another page");
// Should be an <a> tag
expect(html).toMatch(/^<a\s/);
});
it("renders children as anchor content", () => {
const html = ReactDOMServer.renderToString(
React.createElement(Link, { href: "/about" }, "About Us"),
);
expect(html).toContain("About Us");
expect(html).toContain('href="/about"');
});
it("renders with object href", () => {
const html = ReactDOMServer.renderToString(
React.createElement(
Link,
{ href: { pathname: "/search", query: { q: "test" } } },
"Search",
),
);
// resolveHref({ pathname: "/search", query: { q: "test" } }) -> "/search?q=test"
expect(html).toContain('href="/search?q=test"');
});
it("renders object href with only query (defaults to /)", () => {
const html = ReactDOMServer.renderToString(
React.createElement(
Link,
{ href: { query: { tab: "settings" } } },
"Settings",
),
);
expect(html).toContain('href="/?tab=settings"');
});
it("renders with as prop overriding href", () => {
// Legacy pattern: href is the route pattern, as is the actual URL
const html = ReactDOMServer.renderToString(
React.createElement(
Link,
{ href: "/user/[id]", as: "/user/42" },
"User 42",
),
);
expect(html).toContain('href="/user/42"');
});
it("does not render passHref as an HTML attribute", () => {
const html = ReactDOMServer.renderToString(
React.createElement(Link, { href: "/test", passHref: true }, "Test"),
);
expect(html).not.toContain("passHref");
expect(html).toContain('href="/test"');
});
it("does not render locale as an HTML attribute", () => {
const html = ReactDOMServer.renderToString(
React.createElement(Link, { href: "/test", locale: "fr" } as any, "Test"),
);
expect(html).not.toContain('locale=');
});
it("passes through standard anchor attributes", () => {
const html = ReactDOMServer.renderToString(
React.createElement(
Link,
{ href: "/test", className: "nav-link", id: "my-link", "aria-label": "Test link" },
"Test",
),
);
expect(html).toContain('class="nav-link"');
expect(html).toContain('id="my-link"');
expect(html).toContain('aria-label="Test link"');
});
it("renders with React element children", () => {
const html = ReactDOMServer.renderToString(
React.createElement(
Link,
{ href: "/nested" },
React.createElement("span", null, "Nested child"),
),
);
expect(html).toContain("<span>Nested child</span>");
expect(html).toContain('href="/nested"');
});
});
// ─── useLinkStatus ──────────────────────────────────────────────────────
describe("useLinkStatus", () => {
it("returns { pending: false } by default", () => {
let status: { pending: boolean } | undefined;
function TestComponent() {
status = useLinkStatus();
return null;
}
ReactDOMServer.renderToString(React.createElement(TestComponent));
expect(status).toEqual({ pending: false });
});
});
// ─── resolveHref (internal helper, tested via component output) ─────────
describe("Link resolveHref", () => {
it("string href passes through unchanged", () => {
const html = ReactDOMServer.renderToString(
React.createElement(Link, { href: "/about" }, "x"),
);
expect(html).toContain('href="/about"');
});
it("object href with pathname and query", () => {
const html = ReactDOMServer.renderToString(
React.createElement(
Link,
{ href: { pathname: "/items", query: { page: "2", sort: "name" } } },
"x",
),
);
// URLSearchParams preserves insertion order
expect(html).toMatch(/href="\/items\?page=2&(?:amp;)?sort=name"/);
});
it("object href with only pathname", () => {
const html = ReactDOMServer.renderToString(
React.createElement(
Link,
{ href: { pathname: "/dashboard" } },
"x",
),
);
expect(html).toContain('href="/dashboard"');
});
});
// ─── isExternalUrl ──────────────────────────────────────────────────────
describe("isExternalUrl", () => {
it("detects http:// as external", () => {
expect(isExternalUrl("http://example.com")).toBe(true);
});
it("detects https:// as external", () => {
expect(isExternalUrl("https://example.com")).toBe(true);
});
it("detects protocol-relative // as external", () => {
expect(isExternalUrl("//cdn.example.com/image.png")).toBe(true);
});
it("internal paths are not external", () => {
expect(isExternalUrl("/about")).toBe(false);
expect(isExternalUrl("/")).toBe(false);
expect(isExternalUrl("about")).toBe(false);
});
it("hash-only is not external", () => {
expect(isExternalUrl("#section")).toBe(false);
});
});
// ─── isHashOnlyChange ───────────────────────────────────────────────────
describe("isHashOnlyChange", () => {
it("returns true for #fragment", () => {
expect(isHashOnlyChange("#foo")).toBe(true);
expect(isHashOnlyChange("#")).toBe(true);
});
// Server-side (no window) — should return false for non-hash-only
it("returns false for absolute paths on server", () => {
expect(isHashOnlyChange("/other")).toBe(false);
});
});
// ─── applyLocaleToHref (tested via component output) ────────────────────
describe("Link locale handling", () => {
it("locale=false keeps href as-is", () => {
const html = ReactDOMServer.renderToString(
React.createElement(Link, { href: "/about", locale: false } as any, "x"),
);
expect(html).toContain('href="/about"');
});
it("locale=undefined keeps href as-is", () => {
const html = ReactDOMServer.renderToString(
React.createElement(Link, { href: "/about" }, "x"),
);
expect(html).toContain('href="/about"');
});
it("locale string prepends locale prefix", () => {
// When locale is a non-default locale string, it prepends /{locale}
// Note: default locale check uses __VINEXT_DEFAULT_LOCALE__ which is undefined in tests
const html = ReactDOMServer.renderToString(
React.createElement(Link, { href: "/about", locale: "fr" } as any, "x"),
);
expect(html).toContain('href="/fr/about"');
});
it("locale string does not double-prefix", () => {
const html = ReactDOMServer.renderToString(
React.createElement(Link, { href: "/fr/about", locale: "fr" } as any, "x"),
);
// Should not become /fr/fr/about
expect(html).toContain('href="/fr/about"');
});
});