Draft: Add tests for node native fetch interceptor (WIP)
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milesrichardson
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- Basically, `msw` can mostly work with node-native `fetch` powered by undici, but it does not currently create its lone export `createServer` with the `FetchInterceptor` that is necessary to intercept `globalFetch` - Clone the library locally, fix this issue, build it locally, and copy the build files into this Yarn patch Upstream, I've started the chain of PRs necessary to fix this: - mswjs/interceptors#283 (migrate to Node 18) - milesforks/msw-interceptors#5 (wip, add native fetch tests) - Last: one line change to msw that I made in our patch here
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… defined Now that Node v17+ has "native fetch", it's possible to have `globalThis.fetch` but not `location`, both in our own test code and in user test code. So, if `location` is not defined, like in `node-native.fetch` integration tests, then do not try to set it as the base url of a new URL - the caller is responsible for giving a correct location.
…-native shape It seems that the `headers` object when testing `fetch` with `node-native` is nested within `headers._headers`, but is available with `headers.raw()` - so use that as the basis of the left side of the comparison when comparing a header object to the expected one.
…rception Only `http` tests pass, and this is only the one test file (still needs `.body`, `.clone` and `.request` variants). The tests are copied from the general `fetch.test.ts` file, which is similar because it also runs in a Node environment, but different because it uses `cross-fetch`, while this new file uses native `fetch` (note there is no import of a polyfill).
Add `undici` as a development dependency, because we need to import `undici.Agent` so that we can set a dispatcher that intercepts insecure https (equivalent of `httpsAgent` with previous versions of Node). Technically we could accomplish this without a dependency on Undici, but it would require re-implementing the entire `undici.Agent` class, which would be silly. Note this is a _development_ dependency. It is not a regular dependency, because we aren't adding any special undici interceptor; we're only using the `Agent` because it's the only choice we have (Node does not re-export its undici module; we must depend on it)
…hen it exists * When no mock response is defined, the interceptor calls `pureFetch`. * In undici fetch, `RequestInit` accepts an additional property `dispatcher`, which is used for non-global agent configuration, e.g. an insecure https agent for a single request. * If interceptor calls `pureFetch` (because no mock response is defined), make sure it includes the `dispatcher` if it was originally provided
…6 host * Don't assume a single `:` indicates an IPv6 address * Change heuristic for identifying IPv6 address to rely on whether `new URL()` throws an error Ideally this serialization wouldn't be necessary, but the code that constructs the host doesn't have access to the address family of the server where the address came from
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- Point `@mswjs/interceptors` to a tarball that was built from the code in this pending PR: milesforks/msw-interceptors#5 Using commit: milesforks/msw-interceptors@25a8ffa
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depends on #3
This is a WIP and is a follow-up to mswjs#283
So far it basically copies the existing
fetch.tstests but without a polyfill, without https support, and without any of the body/clone/request test variants.