eslint/tests/lib/rules/new-cap.js

   1 /**
   2  * @fileoverview Tests for new-cap rule.
   3  * @author Nicholas C. Zakas
   4  */
   5
   6 "use strict";
   7
   8 //------------------------------------------------------------------------------
   9 // Requirements
  10 //------------------------------------------------------------------------------
  11
  12 const rule = require("../../../lib/rules/new-cap"),
  13     { RuleTester } = require("../../../lib/rule-tester");
  14
  15 //------------------------------------------------------------------------------
  16 // Tests
  17 //------------------------------------------------------------------------------
  18
  19 const ruleTester = new RuleTester();
  20
  21 ruleTester.run("new-cap", rule, {
  22     valid: [
  23         "var x = new Constructor();",
  24         "var x = new a.b.Constructor();",
  25         "var x = new a.b['Constructor']();",
  26         "var x = new a.b[Constructor]();",
  27         "var x = new a.b[constructor]();",
  28         "var x = new function(){};",
  29         "var x = new _;",
  30         "var x = new $;",
  31         "var x = new Σ;",
  32         "var x = new _x;",
  33         "var x = new $x;",
  34         "var x = new this;",
  35         "var x = Array(42)",
  36         "var x = Boolean(42)",
  37         "var x = Date(42)",
  38         "var x = Date.UTC(2000, 0)",
  39         "var x = Error('error')",
  40         "var x = Function('return 0')",
  41         "var x = Number(42)",
  42         "var x = Object(null)",
  43         "var x = RegExp(42)",
  44         "var x = String(42)",
  45         "var x = Symbol('symbol')",
  46         "var x = BigInt('1n')",
  47         "var x = _();",
  48         "var x = $();",
  49         { code: "var x = Foo(42)", options: [{ capIsNew: false }] },
  50         { code: "var x = bar.Foo(42)", options: [{ capIsNew: false }] },
  51         { code: "var x = Foo.bar(42)", options: [{ capIsNew: false }] },
  52         "var x = bar[Foo](42)",
  53         { code: "var x = bar['Foo'](42)", options: [{ capIsNew: false }] },
  54         "var x = Foo.bar(42)",
  55         { code: "var x = new foo(42)", options: [{ newIsCap: false }] },
  56         "var o = { 1: function() {} }; o[1]();",
  57         "var o = { 1: function() {} }; new o[1]();",
  58         { code: "var x = Foo(42);", options: [{ capIsNew: true, capIsNewExceptions: ["Foo"] }] },
  59         { code: "var x = Foo(42);", options: [{ capIsNewExceptionPattern: "^Foo" }] },
  60         { code: "var x = new foo(42);", options: [{ newIsCap: true, newIsCapExceptions: ["foo"] }] },
  61         { code: "var x = new foo(42);", options: [{ newIsCapExceptionPattern: "^foo" }] },
  62         { code: "var x = Object(42);", options: [{ capIsNewExceptions: ["Foo"] }] },
  63
  64         { code: "var x = Foo.Bar(42);", options: [{ capIsNewExceptions: ["Bar"] }] },
  65         { code: "var x = Foo.Bar(42);", options: [{ capIsNewExceptions: ["Foo.Bar"] }] },
  66
  67         { code: "var x = Foo.Bar(42);", options: [{ capIsNewExceptionPattern: "^Foo\\.." }] },
  68         { code: "var x = new foo.bar(42);", options: [{ newIsCapExceptions: ["bar"] }] },
  69         { code: "var x = new foo.bar(42);", options: [{ newIsCapExceptions: ["foo.bar"] }] },
  70
  71         { code: "var x = new foo.bar(42);", options: [{ newIsCapExceptionPattern: "^foo\\.." }] },
  72         { code: "var x = new foo.bar(42);", options: [{ properties: false }] },
  73         { code: "var x = Foo.bar(42);", options: [{ properties: false }] },
  74         { code: "var x = foo.Bar(42);", options: [{ capIsNew: false, properties: false }] }
  75     ],
  76     invalid: [
  77         {
  78             code: "var x = new c();",
  79             errors: [{
  80                 messageId: "lower",
  81                 type: "NewExpression",
  82                 line: 1,
  83                 column: 13,
  84                 endLine: 1,
  85                 endColumn: 14
  86             }]
  87         },
  88         {
  89             code: "var x = new φ;",
  90             errors: [{
  91                 messageId: "lower",
  92                 type: "NewExpression",
  93                 line: 1,
  94                 column: 13,
  95                 endLine: 1,
  96                 endColumn: 14
  97             }]
  98         },
  99         {
 100             code: "var x = new a.b.c;",
 101             errors: [{
 102                 messageId: "lower",
 103                 type: "NewExpression",
 104                 line: 1,
 105                 column: 17,
 106                 endLine: 1,
 107                 endColumn: 18
 108             }]
 109         },
 110         {
 111             code: "var x = new a.b['c'];",
 112             errors: [{
 113                 messageId: "lower",
 114                 type: "NewExpression",
 115                 line: 1,
 116                 column: 17,
 117                 endLine: 1,
 118                 endColumn: 20
 119             }]
 120         },
 121         {
 122             code: "var b = Foo();",
 123             errors: [{
 124                 messageId: "upper",
 125                 type: "CallExpression",
 126                 line: 1,
 127                 column: 9,
 128                 endLine: 1,
 129                 endColumn: 12
 130             }]
 131         },
 132         {
 133             code: "var b = a.Foo();",
 134             errors: [{
 135                 messageId: "upper",
 136                 type: "CallExpression",
 137                 line: 1,
 138                 column: 11,
 139                 endLine: 1,
 140                 endColumn: 14
 141             }]
 142         },
 143         {
 144             code: "var b = a['Foo']();",
 145             errors: [{
 146                 messageId: "upper",
 147                 type: "CallExpression",
 148                 line: 1,
 149                 column: 11,
 150                 endLine: 1,
 151                 endColumn: 16
 152             }]
 153         },
 154         {
 155             code: "var b = a.Date.UTC();",
 156             errors: [{
 157                 messageId: "upper",
 158                 type: "CallExpression",
 159                 line: 1,
 160                 column: 16,
 161                 endLine: 1,
 162                 endColumn: 19
 163             }]
 164         },
 165         {
 166             code: "var b = UTC();",
 167             errors: [{
 168                 messageId: "upper",
 169                 type: "CallExpression",
 170                 line: 1,
 171                 column: 9,
 172                 endLine: 1,
 173                 endColumn: 12
 174             }]
 175         },
 176         {
 177             code: "var a = B.C();",
 178             errors: [
 179                 {
 180                     messageId: "upper",
 181                     type: "CallExpression",
 182                     line: 1,
 183                     column: 11,
 184                     endLine: 1,
 185                     endColumn: 12
 186                 }
 187             ]
 188         },
 189         {
 190             code: "var a = B\n.C();",
 191             errors: [
 192                 {
 193                     messageId: "upper",
 194                     type: "CallExpression",
 195                     line: 2,
 196                     column: 2,
 197                     endLine: 2,
 198                     endColumn: 3
 199                 }
 200             ]
 201         },
 202         {
 203             code: "var a = new B.c();",
 204             errors: [
 205                 {
 206                     messageId: "lower",
 207                     type: "NewExpression",
 208                     line: 1,
 209                     column: 15,
 210                     endLine: 1,
 211                     endColumn: 16
 212                 }
 213             ]
 214         },
 215         {
 216             code: "var a = new B.\nc();",
 217             errors: [
 218                 {
 219                     messageId: "lower",
 220                     type: "NewExpression",
 221                     line: 2,
 222                     column: 1,
 223                     endLine: 2,
 224                     endColumn: 2
 225                 }
 226             ]
 227         },
 228         {
 229             code: "var a = new c();",
 230             errors: [
 231                 {
 232                     messageId: "lower",
 233                     type: "NewExpression",
 234                     line: 1,
 235                     column: 13,
 236                     endLine: 1,
 237                     endColumn: 14
 238                 }
 239             ]
 240         },
 241         {
 242             code: "var a = new b[ ( 'foo' ) ]();",
 243             parserOptions: { ecmaVersion: 6 },
 244             errors: [
 245                 {
 246                     messageId: "lower",
 247                     type: "NewExpression",
 248                     line: 1,
 249                     column: 18,
 250                     endLine: 1,
 251                     endColumn: 23
 252                 }
 253             ]
 254         },
 255         {
 256             code: "var a = new b[`foo`];",
 257             parserOptions: { ecmaVersion: 6 },
 258             errors: [
 259                 {
 260                     messageId: "lower",
 261                     type: "NewExpression",
 262                     line: 1,
 263                     column: 15,
 264                     endLine: 1,
 265                     endColumn: 20
 266                 }
 267             ]
 268         },
 269         {
 270             code: "var a = b[`\\\nFoo`]();",
 271             parserOptions: { ecmaVersion: 6 },
 272             errors: [
 273                 {
 274                     messageId: "upper",
 275                     type: "CallExpression",
 276                     line: 1,
 277                     column: 11,
 278                     endLine: 2,
 279                     endColumn: 5
 280                 }
 281             ]
 282         },
 283
 284         {
 285             code: "var x = Foo.Bar(42);",
 286             options: [{ capIsNewExceptions: ["Foo"] }],
 287             errors: [{ type: "CallExpression", messageId: "upper" }]
 288         },
 289         {
 290             code: "var x = Bar.Foo(42);",
 291
 292             options: [{ capIsNewExceptionPattern: "^Foo\\.." }],
 293             errors: [{ type: "CallExpression", messageId: "upper" }]
 294         },
 295         {
 296             code: "var x = new foo.bar(42);",
 297             options: [{ newIsCapExceptions: ["foo"] }],
 298             errors: [{ type: "NewExpression", messageId: "lower" }]
 299         },
 300         {
 301             code: "var x = new bar.foo(42);",
 302
 303             options: [{ newIsCapExceptionPattern: "^foo\\.." }],
 304             errors: [{ type: "NewExpression", messageId: "lower" }]
 305         }
 306     ]
 307 });