eslint/tests/lib/rules/max-nested-callbacks.js

   1 /**
   2  * @fileoverview Tests for max-nested-callbacks rule.
   3  * @author Ian Christian Myers
   4  */
   5
   6 "use strict";
   7
   8 //------------------------------------------------------------------------------
   9 // Requirements
  10 //------------------------------------------------------------------------------
  11
  12 const rule = require("../../../lib/rules/max-nested-callbacks"),
  13     { RuleTester } = require("../../../lib/rule-tester");
  14
  15 //------------------------------------------------------------------------------
  16 // Helpers
  17 //------------------------------------------------------------------------------
  18
  19 const OPENING = "foo(function() {",
  20     CLOSING = "});";
  21
  22 /**
  23  * Generates a code string with the specified number of nested callbacks.
  24  * @param {int} times The number of times to nest the callbacks.
  25  * @returns {string} Code with the specified number of nested callbacks
  26  * @private
  27  */
  28 function nestFunctions(times) {
  29     let openings = "",
  30         closings = "";
  31
  32     for (let i = 0; i < times; i++) {
  33         openings += OPENING;
  34         closings += CLOSING;
  35     }
  36     return openings + closings;
  37 }
  38
  39 //------------------------------------------------------------------------------
  40 // Tests
  41 //------------------------------------------------------------------------------
  42 const ruleTester = new RuleTester();
  43
  44 ruleTester.run("max-nested-callbacks", rule, {
  45     valid: [
  46         { code: "foo(function() { bar(thing, function(data) {}); });", options: [3] },
  47         { code: "var foo = function() {}; bar(function(){ baz(function() { qux(foo); }) });", options: [2] },
  48         { code: "fn(function(){}, function(){}, function(){});", options: [2] },
  49         { code: "fn(() => {}, function(){}, function(){});", options: [2], parserOptions: { ecmaVersion: 6 } },
  50         nestFunctions(10),
  51
  52         // object property options
  53         { code: "foo(function() { bar(thing, function(data) {}); });", options: [{ max: 3 }] }
  54     ],
  55     invalid: [
  56         {
  57             code: "foo(function() { bar(thing, function(data) { baz(function() {}); }); });",
  58             options: [2],
  59             errors: [{ messageId: "exceed", data: { num: 3, max: 2 }, type: "FunctionExpression" }]
  60         },
  61         {
  62             code: "foo(function() { bar(thing, (data) => { baz(function() {}); }); });",
  63             options: [2],
  64             parserOptions: { ecmaVersion: 6 },
  65             errors: [{ messageId: "exceed", data: { num: 3, max: 2 }, type: "FunctionExpression" }]
  66         },
  67         {
  68             code: "foo(() => { bar(thing, (data) => { baz( () => {}); }); });",
  69             options: [2],
  70             parserOptions: { ecmaVersion: 6 },
  71             errors: [{ messageId: "exceed", data: { num: 3, max: 2 }, type: "ArrowFunctionExpression" }]
  72         },
  73         {
  74             code: "foo(function() { if (isTrue) { bar(function(data) { baz(function() {}); }); } });",
  75             options: [2],
  76             errors: [{ messageId: "exceed", data: { num: 3, max: 2 }, type: "FunctionExpression" }]
  77         },
  78         {
  79             code: nestFunctions(11),
  80             errors: [{ messageId: "exceed", data: { num: 11, max: 10 }, type: "FunctionExpression" }]
  81         },
  82         {
  83             code: nestFunctions(11),
  84             options: [{}],
  85             errors: [{ messageId: "exceed", data: { num: 11, max: 10 }, type: "FunctionExpression" }]
  86         },
  87         {
  88             code: "foo(function() {})",
  89             options: [{ max: 0 }],
  90             errors: [{ messageId: "exceed", data: { num: 1, max: 0 } }]
  91         },
  92
  93         // object property options
  94         {
  95             code: "foo(function() { bar(thing, function(data) { baz(function() {}); }); });",
  96             options: [{ max: 2 }],
  97             errors: [{ messageId: "exceed", data: { num: 3, max: 2 }, type: "FunctionExpression" }]
  98         }
  99     ]
 100 });