eslint/tests/lib/rules/no-sparse-arrays.js

   1 /**
   2  * @fileoverview Disallow sparse arrays
   3  * @author Nicholas C. Zakas
   4  */
   5 "use strict";
   6
   7 //------------------------------------------------------------------------------
   8 // Requirements
   9 //------------------------------------------------------------------------------
  10
  11 const rule = require("../../../lib/rules/no-sparse-arrays"),
  12     { RuleTester } = require("../../../lib/rule-tester");
  13
  14 //------------------------------------------------------------------------------
  15 // Tests
  16 //------------------------------------------------------------------------------
  17
  18 const ruleTester = new RuleTester();
  19
  20 ruleTester.run("no-sparse-arrays", rule, {
  21
  22     valid: [
  23         "var a = [ 1, 2, ]"
  24     ],
  25
  26     invalid: [
  27         {
  28             code: "var a = [,];",
  29             errors: [{
  30                 messageId: "unexpectedSparseArray",
  31                 type: "ArrayExpression"
  32             }]
  33         },
  34         {
  35             code: "var a = [ 1,, 2];",
  36             errors: [{
  37                 messageId: "unexpectedSparseArray",
  38                 type: "ArrayExpression"
  39             }]
  40         }
  41     ]
  42 });