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(v16.x backport) test: avoid deep comparisons with literals #42021

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tniessen
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Manual backport of #40634 to v16.

Comparing any value to any non-RegExp literal or undefined using
strictEqual (or notStrictEqual) passes if and only if deepStrictEqual
(or notDeepStrictEqual, respectively) passes.

Unnecessarily using deep comparisons adds confusion.

This patch adds an ESLint rule that forbids the use of deepStrictEqual
and notDeepStrictEqual when the expected value (i.e., the second
argument) is a non-RegExp literal or undefined.

For reference, an ESTree literal is defined as follows.

    extend interface Literal <: Expression {
        type: "Literal";
        value: string | boolean | null | number | RegExp | bigint;
    }

The value `undefined` is an `Identifier` with `name: 'undefined'`.

PR-URL: nodejs#40634
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Voltrex <mohammadkeyvanzade94@gmail.com>
@nodejs-github-bot nodejs-github-bot added esm Issues and PRs related to the ECMAScript Modules implementation. needs-ci PRs that need a full CI run. test Issues and PRs related to the tests. v16.x labels Feb 16, 2022
@richardlau richardlau added the request-ci Add this label to start a Jenkins CI on a PR. label Feb 17, 2022
@github-actions github-actions bot removed the request-ci Add this label to start a Jenkins CI on a PR. label Feb 17, 2022
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Windows CI keeps failing... 😑

17:08:19 + rm node/test/fixtures/keys/ca1-cert.pem
17:08:19 rm: cannot remove 'node/test/fixtures/keys/ca1-cert.pem': No such file or directory
17:08:19 + true
17:08:19 Archiving artifacts
17:08:19 Recording test results
17:08:20 ERROR: Step ‘Publish JUnit test result report’ failed: No test report files were found. Configuration error?

@richardlau
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It was actually an earlier git fetch --prune ... call that was being timed out (initially at 15 mins, nodejs/reliability#205 (comment)). I increased the timeout to 30 mins, we still had the time out but cleaning out the workspace on the machine appears to have allowed the CI to pass.

danielleadams pushed a commit that referenced this pull request Feb 25, 2022
Comparing any value to any non-RegExp literal or undefined using
strictEqual (or notStrictEqual) passes if and only if deepStrictEqual
(or notDeepStrictEqual, respectively) passes.

Unnecessarily using deep comparisons adds confusion.

This patch adds an ESLint rule that forbids the use of deepStrictEqual
and notDeepStrictEqual when the expected value (i.e., the second
argument) is a non-RegExp literal or undefined.

For reference, an ESTree literal is defined as follows.

    extend interface Literal <: Expression {
        type: "Literal";
        value: string | boolean | null | number | RegExp | bigint;
    }

The value `undefined` is an `Identifier` with `name: 'undefined'`.

PR-URL: #40634
Backport-PR-URL: #42021
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Voltrex <mohammadkeyvanzade94@gmail.com>
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Landed in 23fc205

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5 participants