eslint/tests/lib/rules/unicode-bom.js

   1 /**
   2  * @fileoverview Check that the Unicode BOM can be required and disallowed
   3  * @author Andrew Johnston <https://github.com/ehjay>
   4  */
   5 "use strict";
   6
   7 //------------------------------------------------------------------------------
   8 // Requirements
   9 //------------------------------------------------------------------------------
  10
  11 const rule = require("../../../lib/rules/unicode-bom"),
  12     { RuleTester } = require("../../../lib/rule-tester");
  13
  14 //------------------------------------------------------------------------------
  15 // Tests
  16 //------------------------------------------------------------------------------
  17
  18 const ruleTester = new RuleTester();
  19 const expectedError = { messageId: "expected", type: "Program" };
  20 const unexpectedError = { messageId: "unexpected", type: "Program" };
  21
  22 ruleTester.run("unicode-bom", rule, {
  23
  24     valid: [
  25         {
  26             code: "\uFEFF var a = 123;",
  27             options: ["always"]
  28         },
  29         {
  30             code: "var a = 123;",
  31             options: ["never"]
  32         },
  33         {
  34             code: "var a = 123; \uFEFF",
  35             options: ["never"]
  36         }
  37     ],
  38
  39     invalid: [
  40         {
  41             code: "var a = 123;",
  42             output: "\uFEFFvar a = 123;",
  43             options: ["always"],
  44             errors: [expectedError]
  45         },
  46         {
  47             code: " // here's a comment \nvar a = 123;",
  48             output: "\uFEFF // here's a comment \nvar a = 123;",
  49             options: ["always"],
  50             errors: [expectedError]
  51         },
  52         {
  53             code: "\uFEFF var a = 123;",
  54             output: " var a = 123;",
  55             errors: [unexpectedError]
  56         },
  57         {
  58             code: "\uFEFF var a = 123;",
  59             output: " var a = 123;",
  60             options: ["never"],
  61             errors: [unexpectedError]
  62         }
  63     ]
  64 });