eslint/tests/lib/rules/no-unused-labels.js

   1 /**
   2  * @fileoverview Tests for no-unused-labels rule.
   3  * @author Toru Nagashima
   4  */
   5
   6 "use strict";
   7
   8 //------------------------------------------------------------------------------
   9 // Requirements
  10 //------------------------------------------------------------------------------
  11
  12 const rule = require("../../../lib/rules/no-unused-labels"),
  13     { RuleTester } = require("../../../lib/rule-tester");
  14
  15 //------------------------------------------------------------------------------
  16 // Tests
  17 //------------------------------------------------------------------------------
  18
  19 const ruleTester = new RuleTester();
  20
  21 ruleTester.run("no-unused-labels", rule, {
  22     valid: [
  23         "A: break A;",
  24         "A: { foo(); break A; bar(); }",
  25         "A: if (a) { foo(); if (b) break A; bar(); }",
  26         "A: for (var i = 0; i < 10; ++i) { foo(); if (a) break A; bar(); }",
  27         "A: for (var i = 0; i < 10; ++i) { foo(); if (a) continue A; bar(); }",
  28         "A: { B: break B; C: for (var i = 0; i < 10; ++i) { foo(); if (a) break A; if (c) continue C; bar(); } }",
  29         "A: { var A = 0; console.log(A); break A; console.log(A); }"
  30     ],
  31     invalid: [
  32         {
  33             code: "A: var foo = 0;",
  34             output: "var foo = 0;",
  35             errors: [{ messageId: "unused" }]
  36         },
  37         {
  38             code: "A: { foo(); bar(); }",
  39             output: "{ foo(); bar(); }",
  40             errors: [{ messageId: "unused" }]
  41         },
  42         {
  43             code: "A: if (a) { foo(); bar(); }",
  44             output: "if (a) { foo(); bar(); }",
  45             errors: [{ messageId: "unused" }]
  46         },
  47         {
  48             code: "A: for (var i = 0; i < 10; ++i) { foo(); if (a) break; bar(); }",
  49             output: "for (var i = 0; i < 10; ++i) { foo(); if (a) break; bar(); }",
  50             errors: [{ messageId: "unused" }]
  51         },
  52         {
  53             code: "A: for (var i = 0; i < 10; ++i) { foo(); if (a) continue; bar(); }",
  54             output: "for (var i = 0; i < 10; ++i) { foo(); if (a) continue; bar(); }",
  55             errors: [{ messageId: "unused" }]
  56         },
  57         {
  58             code: "A: for (var i = 0; i < 10; ++i) { B: break A; }",
  59             output: "A: for (var i = 0; i < 10; ++i) { break A; }",
  60             errors: [{ messageId: "unused", data: { name: "B" } }]
  61         },
  62         {
  63             code: "A: { var A = 0; console.log(A); }",
  64             output: "{ var A = 0; console.log(A); }",
  65             errors: [{ messageId: "unused" }]
  66         },
  67         {
  68             code: "A: /* comment */ foo",
  69             output: null,
  70             errors: [{ messageId: "unused" }]
  71         },
  72         {
  73             code: "A /* comment */: foo",
  74             output: null,
  75             errors: [{ messageId: "unused" }]
  76         }
  77
  78         /*
  79          * Below is fatal errors.
  80          * "A: break B",
  81          * "A: function foo() { break A; }",
  82          * "A: class Foo { foo() { break A; } }",
  83          * "A: { A: { break A; } }"
  84          */
  85     ]
  86 });