Jest: toEqual doesn't do deep equal

[bondom]

🐛 Bug Report

toEqual doesn't do deep equal

To Reproduce

just run:

 expect({
      target: {
        value: 'a',
        nodeType: 1
      }
    }).toEqual({
      target: {
        value: 'asd sad asd ad asdasdasd asdasdsa',
        nodeType: 1
      }
    });

Test will pass

Expected behavior

Test shoudn't pass

Link to repl or repo (highly encouraged)

https://github.com/bondom/jest-bug

Run npx envinfo --preset jest

Paste the results here:

   System:
    OS: macOS High Sierra 10.13.4
    CPU: x64 Intel(R) Core(TM) i5-7360U CPU @ 2.30GHz
  Binaries:
    Node: 8.10.0 - /usr/local/bin/node
    npm: 6.0.1 - /usr/local/bin/npm
  npmPackages:
    jest: ^22.4.4 => 22.4.4

[rickhanlonii]

@bondom thanks for the report - the issue here is that the nodeType field makes Jest think that this is a dom node (see here).

This, for example, will fail:

expect({
  target: {
    value: "a",
    type: 1
  }
}).toEqual({
  target: {
    value: "asd sad asd ad asdasdasd asdasdsa",
    type: 1
  }
});

[SimenB]

Was just about to write the same thing.

Can we make isDomNode more robust?

[SimenB]

Jasmine's implementation is a _bit_ better: https://github.com/jasmine/jasmine/blob/e2d9eefccdca3916b341a4927de7919003525cbc/src/core/base.js#L103-L112

EDIT: Heh, fixed 2 weeks ago: https://github.com/jasmine/jasmine/commit/ced2b114e47d3e0e108781dab3627aabc8515813

[yeahio]

How about documenting this speciality behaviour? There's nothing in the paragraph about toEqual. What could be worse than an unreliable test framework?

[jeysal]

@yeahio this bug has been fixed, and I've just tried it out and confirmed that it still is fixed