eslint/tests/lib/rules/no-duplicate-case.js

   1 /**
   2  * @fileoverview Tests for no-duplicate-case rule.
   3  * @author Dieter Oberkofler
   4  */
   5
   6 "use strict";
   7
   8 //------------------------------------------------------------------------------
   9 // Requirements
  10 //------------------------------------------------------------------------------
  11
  12 const rule = require("../../../lib/rules/no-duplicate-case"),
  13     { RuleTester } = require("../../../lib/rule-tester");
  14
  15 //------------------------------------------------------------------------------
  16 // Tests
  17 //------------------------------------------------------------------------------
  18
  19 const ruleTester = new RuleTester();
  20
  21 ruleTester.run("no-duplicate-case", rule, {
  22     valid: [
  23         "var a = 1; switch (a) {case 1: break; case 2: break; default: break;}",
  24         "var a = 1; switch (a) {case 1: break; case '1': break; default: break;}",
  25         "var a = 1; switch (a) {case 1: break; case true: break; default: break;}",
  26         "var a = 1; switch (a) {default: break;}",
  27         "var a = 1, p = {p: {p1: 1, p2: 1}}; switch (a) {case p.p.p1: break; case p.p.p2: break; default: break;}",
  28         "var a = 1, f = function(b) { return b ? { p1: 1 } : { p1: 2 }; }; switch (a) {case f(true).p1: break; case f(true, false).p1: break; default: break;}",
  29         "var a = 1, f = function(s) { return { p1: s } }; switch (a) {case f(a + 1).p1: break; case f(a + 2).p1: break; default: break;}",
  30         "var a = 1, f = function(s) { return { p1: s } }; switch (a) {case f(a == 1 ? 2 : 3).p1: break; case f(a === 1 ? 2 : 3).p1: break; default: break;}",
  31         "var a = 1, f1 = function() { return { p1: 1 } }, f2 = function() { return { p1: 2 } }; switch (a) {case f1().p1: break; case f2().p1: break; default: break;}",
  32         "var a = [1,2]; switch(a.toString()){case ([1,2]).toString():break; case ([1]).toString():break; default:break;}",
  33         "switch(a) { case a: break; } switch(a) { case a: break; }",
  34         "switch(a) { case toString: break; }"
  35     ],
  36     invalid: [
  37         {
  38             code: "var a = 1; switch (a) {case 1: break; case 1: break; case 2: break; default: break;}",
  39             errors: [{
  40                 messageId: "unexpected",
  41                 type: "SwitchCase",
  42                 column: 39
  43             }]
  44         },
  45         {
  46             code: "var a = '1'; switch (a) {case '1': break; case '1': break; case '2': break; default: break;}",
  47             errors: [{
  48                 messageId: "unexpected",
  49                 type: "SwitchCase",
  50                 column: 43
  51             }]
  52         },
  53         {
  54             code: "var a = 1, one = 1; switch (a) {case one: break; case one: break; case 2: break; default: break;}",
  55             errors: [{
  56                 messageId: "unexpected",
  57                 type: "SwitchCase",
  58                 column: 50
  59             }]
  60         },
  61         {
  62             code: "var a = 1, p = {p: {p1: 1, p2: 1}}; switch (a) {case p.p.p1: break; case p.p.p1: break; default: break;}",
  63             errors: [{
  64                 messageId: "unexpected",
  65                 type: "SwitchCase",
  66                 column: 69
  67             }]
  68         },
  69         {
  70             code: "var a = 1, f = function(b) { return b ? { p1: 1 } : { p1: 2 }; }; switch (a) {case f(true).p1: break; case f(true).p1: break; default: break;}",
  71             errors: [{
  72                 messageId: "unexpected",
  73                 type: "SwitchCase",
  74                 column: 103
  75             }]
  76         },
  77         {
  78             code: "var a = 1, f = function(s) { return { p1: s } }; switch (a) {case f(a + 1).p1: break; case f(a + 1).p1: break; default: break;}",
  79             errors: [{
  80                 messageId: "unexpected",
  81                 type: "SwitchCase",
  82                 column: 87
  83             }]
  84         },
  85         {
  86             code: "var a = 1, f = function(s) { return { p1: s } }; switch (a) {case f(a === 1 ? 2 : 3).p1: break; case f(a === 1 ? 2 : 3).p1: break; default: break;}",
  87             errors: [{
  88                 messageId: "unexpected",
  89                 type: "SwitchCase",
  90                 column: 97
  91             }]
  92         },
  93         {
  94             code: "var a = 1, f1 = function() { return { p1: 1 } }; switch (a) {case f1().p1: break; case f1().p1: break; default: break;}",
  95             errors: [{
  96                 messageId: "unexpected",
  97                 type: "SwitchCase",
  98                 column: 83
  99             }]
 100         },
 101         {
 102             code: "var a = [1, 2]; switch(a.toString()){case ([1, 2]).toString():break; case ([1, 2]).toString():break; default:break;}",
 103             errors: [{
 104                 messageId: "unexpected",
 105                 type: "SwitchCase",
 106                 column: 70
 107             }]
 108         },
 109         {
 110             code: "switch (a) { case a: case a: }",
 111             errors: [{
 112                 messageId: "unexpected",
 113                 type: "SwitchCase",
 114                 column: 22
 115             }]
 116         },
 117         {
 118             code: "switch (a) { case a: break; case b: break; case a: break; case c: break; case a: break; }",
 119             errors: [
 120                 {
 121                     messageId: "unexpected",
 122                     type: "SwitchCase",
 123                     column: 44
 124                 },
 125                 {
 126                     messageId: "unexpected",
 127                     type: "SwitchCase",
 128                     column: 74
 129                 }
 130             ]
 131         }
 132     ]
 133 });