[Bug]: Native fetch Arrays Incorrectly Matched #15025
Description
Version
v30.0.0-alpha.3 and v29.7.0
Steps to reproduce
- Create a test file with this code
it('matches fetch parsed Array', async () => {
expect(await (await fetch('https://avatar.roblox.com/v1/users/1/outfits')).json()).toMatchObject({
data: expect.any(Array),
filteredCount: expect.any(Number),
total: expect.any(Number)
})
})
it('matches manually parsed Array', async () => {
expect(JSON.parse(await (await fetch('https://avatar.roblox.com/v1/users/1/outfits')).text())).toMatchObject({
data: expect.any(Array),
filteredCount: expect.any(Number),
total: expect.any(Number)
})
})- Run Jest
Expected behavior
Jest should identify the data property in the response body parsed by fetch as an Array.
Actual behavior
Jest does not identify the data property in the response body as an Array if it is parsed by fetch, only if it is parsed using JSON.parse.
Additional context
I am using the latest Node.js LTS version (v20.12.2)
Environment
System:
OS: macOS 13.2.1
CPU: (8) arm64 Apple M1 Pro
Binaries:
Node: 20.12.2 - /usr/local/bin/node
npm: 10.5.0 - /usr/local/bin/npm
pnpm: 7.30.3 - /usr/local/bin/pnpm
npmPackages:
jest: ^29.7.0 => 29.7.0