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referrer-policy.test.ts
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referrer-policy.test.ts
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import { check } from "./helpers";
import referrerPolicy from "../middlewares/referrer-policy";
describe("Referrer-Policy middleware", () => {
it("sets header to no-referrer when passed no policy", async () => {
await check(referrerPolicy(), {
"referrer-policy": "no-referrer",
});
await check(referrerPolicy({}), {
"referrer-policy": "no-referrer",
});
await check(referrerPolicy(Object.create(null)), {
"referrer-policy": "no-referrer",
});
await check(referrerPolicy({ policy: undefined }), {
"referrer-policy": "no-referrer",
});
});
(
[
"no-referrer",
"no-referrer-when-downgrade",
"same-origin",
"origin",
"strict-origin",
"origin-when-cross-origin",
"strict-origin-when-cross-origin",
"unsafe-url",
"",
] as const
).forEach((policy) => {
it(`can set the header to "${policy}" by specifying it as a string`, async () => {
await check(referrerPolicy({ policy }), {
"referrer-policy": policy,
});
});
it(`can set the header to "${policy}" by specifying it as an array string`, async () => {
await check(referrerPolicy({ policy: [policy] }), {
"referrer-policy": policy,
});
});
});
it("can set an array with multiple values", async () => {
await check(referrerPolicy({ policy: ["origin", "unsafe-url"] }), {
"referrer-policy": "origin,unsafe-url",
});
});
it("fails with a bad policy", () => {
const invalidValues = ["foo", "sameorigin", "ORIGIN", 123, false, null, {}];
for (const policy of invalidValues) {
expect(referrerPolicy.bind(null, { policy: policy as any })).toThrow();
}
});
it("fails with an empty array", () => {
expect(referrerPolicy.bind(null, { policy: [] })).toThrow();
});
it("fails with duplicate values", () => {
expect(
referrerPolicy.bind(null, { policy: ["origin", "origin"] })
).toThrow();
expect(
referrerPolicy.bind(null, {
policy: ["same-origin", "origin", "same-origin"],
})
).toThrow();
});
});