eslint-plugin-test-signal

ESLint plugin for flagging weak tests before they become false confidence.

The first rule set focuses on:

• snapshot-only coverage;
• mock-call-only tests;
• unawaited Promise assertions;
• async tests without assertions;
• suites that never exercise a negative path.

Table of contents

1. Installation
2. Quick start
3. Presets
4. Rules
5. Compatibility

Installation

npm install --save-dev eslint-plugin-test-signal eslint typescript

Quick start

import testSignal from "eslint-plugin-test-signal";

export default [testSignal.configs.recommended];

The bundled presets target common test file globs and register @typescript-eslint/parser automatically.

Presets

import testSignal from "eslint-plugin-test-signal";

export default [
 testSignal.configs.minimal,
 // testSignal.configs.recommended,
 // testSignal.configs["recommended-type-checked"],
 // testSignal.configs.strict,
 // testSignal.configs.all,
 // testSignal.configs.experimental,
];

Preset	Intent
testSignal.configs.minimal	Lowest-noise async correctness checks.
testSignal.configs.recommended	Default weak-test signal coverage.
testSignal.configs["recommended-type-checked"]	Compatibility preset for future typed rules.
testSignal.configs.strict	Recommended plus negative-path coverage enforcement.
testSignal.configs.all	Every stable rule.
testSignal.configs.experimental	Stable rules plus future candidates.

Rules

• Fix legend:
  • fix = autofixable
  • suggest = suggestions available
  • - = report only
• Preset key legend:
  • 🟢 - testSignal.configs.minimal
  • 🟡 - testSignal.configs.recommended
  • 🟠 - testSignal.configs["recommended-type-checked"]
  • 🔴 - testSignal.configs.strict
  • 🟣 - testSignal.configs.all
  • 🧪 - testSignal.configs.experimental

Rule	Fix	Preset key
no-assertions-in-hooks	-	🔴 🟣
no-async-foreach-assertions	-	🟡 🔴 🟣
no-broad-object-key-count-assertions	-	🔴 🟣
no-conditional-assertions	-	🟡 🔴 🟣
no-constant-assertions	-	🟡 🔴 🟣
no-disabled-tests	-	🟡 🔴 🟣
no-duplicate-assertions	-	🔴 🟣
no-empty-async-tests	-	🟢 🟡 🔴 🟣
no-fixed-delay-tests	-	🔴 🟣
no-focused-tests	-	🟢 🟡 🔴 🟣
no-identical-expected-actual	-	🟡 🔴 🟣
no-mock-call-only-tests	-	🟡 🔴 🟣
no-snapshot-only-tests	-	🟡 🔴 🟣
no-synthetic-promise-assertions	-	🟡 🔴 🟣
no-tautological-length-assertions	-	🟡 🔴 🟣
no-try-catch-assertions	-	🔴 🟣
no-vacuous-numeric-assertions	-	🟡 🔴 🟣
no-vacuous-string-assertions	-	🟡 🔴 🟣
no-weak-asymmetric-assertions	-	🟡 🔴 🟣
no-weak-existence-assertions	-	🟡 🔴 🟣
no-weak-truthy-assertions	-	🟡 🔴 🟣
require-assertions	-	🟡 🔴 🟣
require-awaited-async-assertions	-	🟢 🟡 🔴 🟣
require-error-message-assertions	-	🔴 🟣
require-negative-path	-	🔴 🟣

Compatibility

• Supported ESLint versions: 9.x and 10.x
• Config system: Flat Config
• Node.js runtime: >=22.0.0