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Use.test.js
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Use.test.js
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import React from "react";
import ReactDOMServer from "react-dom/server";
import Use from "../Use";
import Svg from "../Svg";
import { render } from "react-testing-library";
import fetchMock, { MATCHED, UNMATCHED } from "fetch-mock";
import { resetCache } from "../getCache";
beforeEach(resetCache);
fetchMock.config.warnOnFallback = false;
describe("Use polyfill", () => {
describe("without external URL", () => {
test("should render a <use> element", () => {
const { container } = render(<Use />);
expect(container.firstChild).toMatchSnapshot();
});
test("renders a local xlink:href", () => {
const { container } = render(<Use xlinkHref="#foo" />);
expect(container.firstChild).toMatchSnapshot();
});
test("renders a local href", () => {
const { container } = render(<Use href="#foo" />);
expect(container.firstChild).toMatchSnapshot();
});
test("renders both types of xlink:href", () => {
const { container } = render(<Use xlinkHref="#foo" />);
expect(container.firstChild).toMatchSnapshot();
});
test("should pass through attributes", () => {
const { container } = render(<Use data-foo="bar" viewBox="0 0 1 1" />);
expect(container.firstChild).toMatchSnapshot();
});
test("should expose a <use> ref", () => {
const ref = React.createRef();
render(<Use ref={ref} />);
expect(ref.current).toBeInstanceOf(Element);
expect(ref.current.tagName).toMatch(/^use$/i);
});
});
describe("with external URL", () => {
// NOTE: This assumes Jest's testURL is set to the default of "http://localhost"
beforeEach(() => {
fetchMock.getOnce(
(url, opts) =>
url === "http://localhost/sprites.svg" && opts.mode === "same-origin",
{
headers: {
"content-type": "image/svg+xml"
},
body: ReactDOMServer.renderToStaticMarkup(
<svg xmlns="http://www.w3.org/2000/svg" style={{ display: "none" }}>
<symbol viewBox="0 0 20 20" id="symbol-1">
<circle cx="10" cy="10" r="10" stroke="black" fill="red" />
</symbol>
<symbol id="symbol-2">
<ellipse
cx="10"
cy="10"
rx="10"
ry="5"
stroke="black"
fill="red"
/>
</symbol>
</svg>
)
}
);
fetchMock.getOnce(
(url, opts) =>
url === "http://localhost/sprites-slow.svg" &&
opts.mode === "same-origin",
async () => {
await new Promise(resolve => setTimeout(resolve, 200));
return {
headers: {
"content-type": "image/svg+xml"
},
body: ReactDOMServer.renderToStaticMarkup(
<svg
xmlns="http://www.w3.org/2000/svg"
style={{ display: "none" }}
>
<symbol viewBox="0 0 20 20" id="symbol-slow-1">
<circle cx="10" cy="10" r="10" stroke="green" fill="yellow" />
</symbol>
</svg>
)
};
}
);
fetchMock.getOnce(
(url, opts) =>
url === "http://localhost/sprites-404.svg" &&
opts.mode === "same-origin",
404
);
});
afterEach(() => {
fetchMock.reset();
});
test("should request the external resource via href", async () => {
render(
<Svg>
<Use href="http://localhost/sprites.svg#symbol-1" />
</Svg>
);
await fetchMock.flush();
expect(fetchMock.called(MATCHED)).toBe(true);
});
test("should request the external resource via xlinkHref", async () => {
render(
<Svg>
<Use xlinkHref="http://localhost/sprites.svg#symbol-1" />
</Svg>
);
await fetchMock.flush();
expect(fetchMock.called(MATCHED)).toBe(true);
});
test("should prefer the href prop when requesting a resource", async () => {
render(
<Svg>
<Use
href="http://localhost/sprites.svg#symbol-1"
xlinkHref="http://localhost/sprites-nope.svg#symbol-1"
/>
</Svg>
);
await fetchMock.flush();
expect(fetchMock.called(MATCHED)).toBe(true);
expect(fetchMock.called(UNMATCHED)).toBe(false);
});
test("should not request a cross-origin resource", async () => {
render(
<Svg>
<Use href="http://www.example.com/sprites.svg#symbol-1" />
</Svg>
);
await fetchMock.flush();
expect(fetchMock.called(MATCHED)).toBe(false);
});
describe("emulating missing location.origin", () => {
// IE 11 doesn't support location.origin
beforeAll(() => {
const originProp = Object.getOwnPropertyDescriptor(
window.location,
"origin"
);
Object.defineProperty(window.location, "origin", {
configurable: true,
value: undefined
});
});
afterAll(() => {
delete window.location.origin;
if (originProp) {
Object.defineProperty(window.location, "origin", originProp);
}
});
test("should not request a cross-origin resource", async () => {
render(
<Svg>
<Use href="http://www.example.com/sprites.svg#symbol-1" />
</Svg>
);
await fetchMock.flush();
expect(fetchMock.called(MATCHED)).toBe(false);
});
});
test.skip("should cache the external resource across synchronous renders", async () => {
// FIXME: This inadvertently hits an edge case where rerendering before the response is fully
// handled causes an unintended cache miss. TODO: Rewrite internals to use DataLoader
// instead.
const { rerender } = render(
<Svg>
<Use href="http://localhost/sprites.svg#symbol-1" />
</Svg>
);
rerender(
<Svg>
<Use href="http://localhost/sprites.svg#symbol-nope" />
</Svg>
);
await fetchMock.flush();
expect(fetchMock.calls(MATCHED)).toHaveLength(1);
});
test("should cache the external resource across renders", async () => {
const { rerender } = render(
<Svg>
<Use href="http://localhost/sprites.svg#symbol-1" />
</Svg>
);
await fetchMock.flush();
await Promise.resolve();
rerender(
<Svg>
<Use href="http://localhost/sprites.svg#symbol-nope" />
</Svg>
);
await fetchMock.flush();
expect(fetchMock.calls(MATCHED)).toHaveLength(1);
});
test("should render a plain <use> tag while loading", () => {
const { container } = render(
<Svg>
<Use href="http://localhost/sprites.svg#symbol-1" />
</Svg>
);
expect(container.firstChild).toMatchSnapshot();
});
test("should embed the referenced symbol in the output", async () => {
const { container } = render(
<Svg>
<Use href="http://localhost/sprites.svg#symbol-1" />
</Svg>
);
await fetchMock.flush();
await Promise.resolve(); // Let components handle response
expect(container.firstChild).toMatchSnapshot();
});
test("should pass props through to the embedded symbol", async () => {
const { container } = render(
<Svg>
<Use href="http://localhost/sprites.svg#symbol-1" data-foo="bar" />
</Svg>
);
await fetchMock.flush();
await Promise.resolve(); // Let components handle response
expect(container.firstChild).toMatchSnapshot();
});
test("should expose a <g> ref once loaded", async () => {
const ref = React.createRef();
render(
<Svg>
<Use ref={ref} href="http://localhost/sprites.svg#symbol-1" />
</Svg>
);
await fetchMock.flush();
await Promise.resolve(); // Let components handle response
expect(ref.current).toBeInstanceOf(Element);
expect(ref.current.tagName).toMatch(/^g$/i);
});
test("should output <g /> if the referenced symbol doesn't exist", async () => {
const { container } = render(
<Svg>
<Use href="http://localhost/sprites.svg#symbol-nope" />
</Svg>
);
await fetchMock.flush();
await Promise.resolve(); // Let components handle response
expect(container.firstChild).toMatchSnapshot();
});
test("should fall back to <use /> if the request hits a network error", async () => {
const { container } = render(
<Svg>
<Use href="http://localhost/sprites-nope.svg" />
</Svg>
);
await fetchMock.flush();
await Promise.resolve(); // Let components handle response
expect(container.firstChild).toMatchSnapshot();
});
test("should fall back to <use /> if the request hits a 404", async () => {
const { container } = render(
<Svg>
<Use href="http://localhost/sprites-404.svg" />
</Svg>
);
await fetchMock.flush();
await Promise.resolve(); // Let components handle response
expect(container.firstChild).toMatchSnapshot();
});
test("should not change if rerendering with the same href", async () => {
const { container, rerender } = render(
<Svg>
<Use href="http://localhost/sprites.svg#symbol-1" />
</Svg>
);
await fetchMock.flush();
await Promise.resolve(); // Let components handle response
const reference = container.cloneNode(true);
rerender(
<Svg>
<Use
// Change the prop from href to xlinkHref to force a (shallow) rerender
xlinkHref="http://localhost/sprites.svg#symbol-1"
/>
</Svg>
);
// Guard against a flash of blank content because of the rerender.
expect(container).toContainHTML(reference.innerHTML);
// Guard against an async load getting triggered at all.
await fetchMock.flush();
await Promise.resolve();
expect(fetchMock.called(UNMATCHED)).toBe(false);
expect(container).toContainHTML(reference.innerHTML);
});
test("tracks the latest href despite another fetch completing later", async () => {
const { container, rerender } = render(
<Svg>
<Use href="http://localhost/sprites-slow.svg#symbol-slow-1" />
</Svg>
);
rerender(
<Svg>
<Use href="http://localhost/sprites.svg#symbol-1" />
</Svg>
);
await fetchMock.flush();
expect(fetchMock.calls(MATCHED)).toHaveLength(2);
await Promise.resolve(); // Let components handle response
expect(container.firstChild).toMatchSnapshot();
});
test("tracks the latest href despite another fetch completing sooner", async () => {
const { container, rerender } = render(
<Svg>
<Use href="http://localhost/sprites.svg#symbol-1" />
</Svg>
);
rerender(
<Svg>
<Use href="http://localhost/sprites-slow.svg#symbol-slow-1" />
</Svg>
);
await fetchMock.flush();
expect(fetchMock.calls(MATCHED)).toHaveLength(2);
await Promise.resolve(); // Let components handle response
expect(container.firstChild).toMatchSnapshot();
});
describe("viewBox", () => {
test("should set and clear as appropriate", async () => {
const { container, rerender } = render(
<Svg>
<Use href="http://localhost/sprites.svg#symbol-1" />
</Svg>
);
await fetchMock.flush();
await Promise.resolve(); // Let components handle response
expect(container.firstChild).toMatchSnapshot();
rerender(
<Svg>
<Use href="http://localhost/sprites.svg#symbol-2" />
</Svg>
);
await fetchMock.flush();
await Promise.resolve(); // Let components handle response
expect(container.firstChild).toMatchSnapshot();
});
test("should not override Svg's viewBox", async () => {
const { container, rerender } = render(
<Svg viewBox="1 2 3 4">
<Use href="http://localhost/sprites.svg#symbol-1" />
</Svg>
);
await fetchMock.flush();
await Promise.resolve(); // Let components handle response
expect(container.firstChild).toMatchSnapshot();
});
});
});
});