Awesome

eslint-plugin-mocha-cleanup

Installation

You'll first need to install ESLint:

$ npm i -D eslint

Next, install eslint-plugin-mocha-cleanup:

$ npm i -D eslint-plugin-mocha-cleanup

Note: If you installed ESLint globally (using the -g flag) then you must also install eslint-plugin-mocha-cleanup globally.

Supported Rules

Almost each rule (unless otherwise indicated) may be customized to ignore skipped tests/suites (describe.skip, it.skip, xspecify, etc.) by adding skipSkipped: true to the rule options. One can also set "settings": {"mocha-cleanup": {"skipSkipped": true}} to have skipping for all applicable rules by default.

• asserts-limit Rule to disallow use of more than an allowed number of assertions. Tests without any assertions are also disallowed. Rule may be customized with setting the maximum number of allowed asserts (Defaults to 3):

"rules": {
    "mocha-cleanup/asserts-limit": [2, {"assertsLimit": 3}]
}

This rule ignores tests with a done-callback and 0 assertions. Set the option ignoreZeroAssertionsIfDoneExists to false to allow such behavior:

"rules": {
    "mocha-cleanup/asserts-limit": [2, {"ignoreZeroAssertionsIfDoneExists": false}]
}

• disallow-stub-spy-restore-in-it Rule to disallow stub/spy/restore in tests (they should instead be in hooks)

• no-empty-title Rule to disallow empty titles in suites and tests

• no-same-titles Rule to disallow identical titles for tests inside of one suite or within the whole file. It depends on the scope value - may be file or suite. Defaults to suite

"rules": {
    "mocha-cleanup/no-same-titles": [2, {"scope": "file"}]
}

• no-nested-it Rule to disallow nested tests (not suites)

• no-assertions-outside-it Rule to disallow assertions outside tests

• complexity-it Counts test-body complexity. May be customized with setting maximum complexity (Defaults to 40):

"rules": {
    "mocha-cleanup/complexity-it": [2, {"maxAllowedComplexity": 30}]
}

• no-eql-primitives Rule to disallow eql, deep.equal, assert.deepEqual, assert.notDeepEqual with primitives

• no-assertions-in-loop Rule to disallow assertions inside loops. Rule may be customized with setting additional loops like forEach:

"rules": {
    "mocha-cleanup/no-assertions-in-loop": [2, {"extraMemberExpression": ["forEach"]}]
}

• no-empty-body Rule to disallow empty tests, suites and hooks

• invalid-assertions Rule to check expect and should assertions for completeness. It detects assertions that end with "chainable" words or even raw calls for expect and should

• no-expressions-in-assertions Rule to detect expressions in expect and assert assertions

• disallowed-usage Rule to disallow usage of some functions, methods or properties in the tests and hooks

"rules": {
    "mocha-cleanup/disallowed-usage": [
        2,
        {
            "test": [{"o": "myObject", "m": ["myNotAllowedMethod"]}],
            "hook": [{"f": "myNotAllowedFunction"}, {"o": "myObject", "p": ["myNotAllowedProperty"]}]
        }
    ]
}

• disallow-stub-window Rule to disallow stubbing some window-methods. IMPORTANT This rule doesn't have a skipSkipped option

• no-outside-declaration Rule to disallow variable declarations outside tests and hooks

• top-level-assertions Rule to check if some assertions are not on top of the test-block. Rule is a "next-level" for no-assertions-in-loop.

Usage

Add to your eslint config-file:

"plugins": [
    "mocha-cleanup"
],
"rules": {
    "mocha-cleanup/asserts-limit": 2,
    "mocha-cleanup/disallow-stub-spy-restore-in-it": 2,
    "mocha-cleanup/no-empty-title": 2,
    "mocha-cleanup/no-same-titles": 2,
    "mocha-cleanup/no-nested-it": 2,
    "mocha-cleanup/no-assertions-outside-it": 2,
    "mocha-cleanup/complexity-it": 2,
    "mocha-cleanup/no-eql-primitives": 2,
    "mocha-cleanup/no-assertions-in-loop": 2,
    "mocha-cleanup/no-empty-body": 2,
    "mocha-cleanup/invalid-assertions": 2,
    "mocha-cleanup/no-expressions-in-assertions": 2,
    "mocha-cleanup/disallowed-usage": [
        2,
        {
            "test": [{"o": "myObject", "m": ["myNotAllowedMethod"]}],
            "hook": [{"f": "myNotAllowedFunction"}, {"o": "myObject", "p": ["myNotAllowedProperty"]}]
        }
    ],
    "mocha-cleanup/disallow-stub-window": [
        2,
        {
            "methods": ["setTimeout"]
        }
    ],
    "mocha-cleanup/no-outside-declaration": 2,
    "mocha-cleanup/top-level-assertions": 1
}

Or, if you want the items exactly as above (not including disallowed-usage, disallow-stub-window and top-level-assertions), just add this:

{
  "extends": ["plugin:mocha-cleanup/recommended"]
}

Or, if you want those items above, minus also the following limit-based rules:

• asserts-limit
• complexity-it

...just add this:

{
  "extends": ["plugin:mocha-cleanup/recommended-no-limits"]
}