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use-isnan.js
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use-isnan.js
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/**
* @fileoverview Tests for use-isnan rule.
* @author James Allardice, Michael Paulukonis
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const rule = require("../../../lib/rules/use-isnan"),
RuleTester = require("../../../lib/rule-tester/rule-tester");
//------------------------------------------------------------------------------
// Tests
//------------------------------------------------------------------------------
const ruleTester = new RuleTester();
const comparisonError = { messageId: "comparisonWithNaN", type: "BinaryExpression" };
ruleTester.run("use-isnan", rule, {
valid: [
"var x = NaN;",
"isNaN(NaN) === true;",
"isNaN(123) !== true;",
"Number.isNaN(NaN) === true;",
"Number.isNaN(123) !== true;",
"foo(NaN + 1);",
"foo(1 + NaN);",
"foo(NaN - 1)",
"foo(1 - NaN)",
"foo(NaN * 2)",
"foo(2 * NaN)",
"foo(NaN / 2)",
"foo(2 / NaN)",
"var x; if (x = NaN) { }",
"var x = Number.NaN;",
"isNaN(Number.NaN) === true;",
"Number.isNaN(Number.NaN) === true;",
"foo(Number.NaN + 1);",
"foo(1 + Number.NaN);",
"foo(Number.NaN - 1)",
"foo(1 - Number.NaN)",
"foo(Number.NaN * 2)",
"foo(2 * Number.NaN)",
"foo(Number.NaN / 2)",
"foo(2 / Number.NaN)",
"var x; if (x = Number.NaN) { }",
"x === Number[NaN];",
"x === (NaN, 1)",
"x === (doStuff(), NaN, 1)",
"x === (doStuff(), Number.NaN, 1)",
//------------------------------------------------------------------------------
// enforceForSwitchCase
//------------------------------------------------------------------------------
{
code: "switch(NaN) { case foo: break; }",
options: [{ enforceForSwitchCase: false }]
},
{
code: "switch(foo) { case NaN: break; }",
options: [{ enforceForSwitchCase: false }]
},
{
code: "switch(NaN) { case NaN: break; }",
options: [{ enforceForSwitchCase: false }]
},
{
code: "switch(foo) { case bar: break; case NaN: break; default: break; }",
options: [{ enforceForSwitchCase: false }]
},
{
code: "switch(foo) {}",
options: [{ enforceForSwitchCase: true }]
},
{
code: "switch(foo) { case bar: NaN; }",
options: [{ enforceForSwitchCase: true }]
},
{
code: "switch(foo) { default: NaN; }",
options: [{ enforceForSwitchCase: true }]
},
{
code: "switch(Nan) {}",
options: [{ enforceForSwitchCase: true }]
},
{
code: "switch('NaN') { default: break; }",
options: [{ enforceForSwitchCase: true }]
},
{
code: "switch(foo(NaN)) {}",
options: [{ enforceForSwitchCase: true }]
},
{
code: "switch(foo.NaN) {}",
options: [{ enforceForSwitchCase: true }]
},
{
code: "switch(foo) { case Nan: break }",
options: [{ enforceForSwitchCase: true }]
},
{
code: "switch(foo) { case 'NaN': break }",
options: [{ enforceForSwitchCase: true }]
},
{
code: "switch(foo) { case foo(NaN): break }",
options: [{ enforceForSwitchCase: true }]
},
{
code: "switch(foo) { case foo.NaN: break }",
options: [{ enforceForSwitchCase: true }]
},
{
code: "switch(foo) { case bar: break; case 1: break; default: break; }",
options: [{ enforceForSwitchCase: true }]
},
{
code: "switch(Number.NaN) { case foo: break; }",
options: [{ enforceForSwitchCase: false }]
},
{
code: "switch(foo) { case Number.NaN: break; }",
options: [{ enforceForSwitchCase: false }]
},
{
code: "switch(NaN) { case Number.NaN: break; }",
options: [{ enforceForSwitchCase: false }]
},
{
code: "switch(foo) { case bar: break; case Number.NaN: break; default: break; }",
options: [{ enforceForSwitchCase: false }]
},
{
code: "switch(foo) { case bar: Number.NaN; }",
options: [{ enforceForSwitchCase: true }]
},
{
code: "switch(foo) { default: Number.NaN; }",
options: [{ enforceForSwitchCase: true }]
},
{
code: "switch(Number.Nan) {}",
options: [{ enforceForSwitchCase: true }]
},
{
code: "switch('Number.NaN') { default: break; }",
options: [{ enforceForSwitchCase: true }]
},
{
code: "switch(foo(Number.NaN)) {}",
options: [{ enforceForSwitchCase: true }]
},
{
code: "switch(foo.Number.NaN) {}",
options: [{ enforceForSwitchCase: true }]
},
{
code: "switch(foo) { case Number.Nan: break }",
options: [{ enforceForSwitchCase: true }]
},
{
code: "switch(foo) { case 'Number.NaN': break }",
options: [{ enforceForSwitchCase: true }]
},
{
code: "switch(foo) { case foo(Number.NaN): break }",
options: [{ enforceForSwitchCase: true }]
},
{
code: "switch(foo) { case foo.Number.NaN: break }",
options: [{ enforceForSwitchCase: true }]
},
{
code: "switch((NaN, doStuff(), 1)) {}",
options: [{ enforceForSwitchCase: true }]
},
{
code: "switch((Number.NaN, doStuff(), 1)) {}",
options: [{ enforceForSwitchCase: true }]
},
//------------------------------------------------------------------------------
// enforceForIndexOf
//------------------------------------------------------------------------------
"foo.indexOf(NaN)",
"foo.lastIndexOf(NaN)",
"foo.indexOf(Number.NaN)",
"foo.lastIndexOf(Number.NaN)",
{
code: "foo.indexOf(NaN)",
options: [{}]
},
{
code: "foo.lastIndexOf(NaN)",
options: [{}]
},
{
code: "foo.indexOf(NaN)",
options: [{ enforceForIndexOf: false }]
},
{
code: "foo.lastIndexOf(NaN)",
options: [{ enforceForIndexOf: false }]
},
{
code: "indexOf(NaN)",
options: [{ enforceForIndexOf: true }]
},
{
code: "lastIndexOf(NaN)",
options: [{ enforceForIndexOf: true }]
},
{
code: "new foo.indexOf(NaN)",
options: [{ enforceForIndexOf: true }]
},
{
code: "foo.bar(NaN)",
options: [{ enforceForIndexOf: true }]
},
{
code: "foo.IndexOf(NaN)",
options: [{ enforceForIndexOf: true }]
},
{
code: "foo[indexOf](NaN)",
options: [{ enforceForIndexOf: true }]
},
{
code: "foo[lastIndexOf](NaN)",
options: [{ enforceForIndexOf: true }]
},
{
code: "indexOf.foo(NaN)",
options: [{ enforceForIndexOf: true }]
},
{
code: "foo.indexOf()",
options: [{ enforceForIndexOf: true }]
},
{
code: "foo.lastIndexOf()",
options: [{ enforceForIndexOf: true }]
},
{
code: "foo.indexOf(a)",
options: [{ enforceForIndexOf: true }]
},
{
code: "foo.lastIndexOf(Nan)",
options: [{ enforceForIndexOf: true }]
},
{
code: "foo.indexOf(a, NaN)",
options: [{ enforceForIndexOf: true }]
},
{
code: "foo.lastIndexOf(NaN, b)",
options: [{ enforceForIndexOf: true }]
},
{
code: "foo.indexOf(a, b)",
options: [{ enforceForIndexOf: true }]
},
{
code: "foo.lastIndexOf(NaN, NaN)",
options: [{ enforceForIndexOf: true }]
},
{
code: "foo.indexOf(...NaN)",
options: [{ enforceForIndexOf: true }],
languageOptions: { ecmaVersion: 6 }
},
{
code: "foo.lastIndexOf(NaN())",
options: [{ enforceForIndexOf: true }]
},
{
code: "foo.indexOf(Number.NaN)",
options: [{}]
},
{
code: "foo.lastIndexOf(Number.NaN)",
options: [{}]
},
{
code: "foo.indexOf(Number.NaN)",
options: [{ enforceForIndexOf: false }]
},
{
code: "foo.lastIndexOf(Number.NaN)",
options: [{ enforceForIndexOf: false }]
},
{
code: "indexOf(Number.NaN)",
options: [{ enforceForIndexOf: true }]
},
{
code: "lastIndexOf(Number.NaN)",
options: [{ enforceForIndexOf: true }]
},
{
code: "new foo.indexOf(Number.NaN)",
options: [{ enforceForIndexOf: true }]
},
{
code: "foo.bar(Number.NaN)",
options: [{ enforceForIndexOf: true }]
},
{
code: "foo.IndexOf(Number.NaN)",
options: [{ enforceForIndexOf: true }]
},
{
code: "foo[indexOf](Number.NaN)",
options: [{ enforceForIndexOf: true }]
},
{
code: "foo[lastIndexOf](Number.NaN)",
options: [{ enforceForIndexOf: true }]
},
{
code: "indexOf.foo(Number.NaN)",
options: [{ enforceForIndexOf: true }]
},
{
code: "foo.lastIndexOf(Number.Nan)",
options: [{ enforceForIndexOf: true }]
},
{
code: "foo.indexOf(a, Number.NaN)",
options: [{ enforceForIndexOf: true }]
},
{
code: "foo.lastIndexOf(Number.NaN, b)",
options: [{ enforceForIndexOf: true }]
},
{
code: "foo.lastIndexOf(Number.NaN, NaN)",
options: [{ enforceForIndexOf: true }]
},
{
code: "foo.indexOf(...Number.NaN)",
options: [{ enforceForIndexOf: true }],
languageOptions: { ecmaVersion: 6 }
},
{
code: "foo.lastIndexOf(Number.NaN())",
options: [{ enforceForIndexOf: true }]
},
{
code: "foo.indexOf((NaN, 1))",
options: [{ enforceForIndexOf: true }]
},
{
code: "foo.lastIndexOf((NaN, 1))",
options: [{ enforceForIndexOf: true }]
},
{
code: "foo.indexOf((Number.NaN, 1))",
options: [{ enforceForIndexOf: true }]
},
{
code: "foo.lastIndexOf((Number.NaN, 1))",
options: [{ enforceForIndexOf: true }]
}
],
invalid: [
{
code: "123 == NaN;",
errors: [{
...comparisonError,
suggestions: [
{
messageId: "replaceWithIsNaN",
output: "Number.isNaN(123);"
},
{
messageId: "replaceWithCastingAndIsNaN",
output: "Number.isNaN(Number(123));"
}
]
}]
},
{
code: "123 === NaN;",
errors: [{
...comparisonError,
suggestions: [
{
messageId: "replaceWithIsNaN",
output: "Number.isNaN(123);"
}
]
}]
},
{
code: "NaN === \"abc\";",
errors: [{
...comparisonError,
suggestions: [
{
messageId: "replaceWithIsNaN",
output: 'Number.isNaN("abc");'
}
]
}]
},
{
code: "NaN == \"abc\";",
errors: [{
...comparisonError,
suggestions: [
{
messageId: "replaceWithIsNaN",
output: 'Number.isNaN("abc");'
},
{
messageId: "replaceWithCastingAndIsNaN",
output: 'Number.isNaN(Number("abc"));'
}
]
}]
},
{
code: "123 != NaN;",
errors: [{
...comparisonError,
suggestions: [
{
messageId: "replaceWithIsNaN",
output: "!Number.isNaN(123);"
},
{
messageId: "replaceWithCastingAndIsNaN",
output: "!Number.isNaN(Number(123));"
}
]
}]
},
{
code: "123 !== NaN;",
errors: [{
...comparisonError,
suggestions: [
{
messageId: "replaceWithIsNaN",
output: "!Number.isNaN(123);"
}
]
}]
},
{
code: "NaN !== \"abc\";",
errors: [{
...comparisonError,
suggestions: [
{
messageId: "replaceWithIsNaN",
output: '!Number.isNaN("abc");'
}
]
}]
},
{
code: "NaN != \"abc\";",
errors: [{
...comparisonError,
suggestions: [
{
messageId: "replaceWithIsNaN",
output: '!Number.isNaN("abc");'
},
{
messageId: "replaceWithCastingAndIsNaN",
output: '!Number.isNaN(Number("abc"));'
}
]
}]
},
{
code: "NaN < \"abc\";",
errors: [{
...comparisonError,
suggestions: []
}]
},
{
code: "\"abc\" < NaN;",
errors: [{
...comparisonError,
suggestions: []
}]
},
{
code: "NaN > \"abc\";",
errors: [{
...comparisonError,
suggestions: []
}]
},
{
code: "\"abc\" > NaN;",
errors: [{
...comparisonError,
suggestions: []
}]
},
{
code: "NaN <= \"abc\";",
errors: [{
...comparisonError,
suggestions: []
}]
},
{
code: "\"abc\" <= NaN;",
errors: [{
...comparisonError,
suggestions: []
}]
},
{
code: "NaN >= \"abc\";",
errors: [{
...comparisonError,
suggestions: []
}]
},
{
code: "\"abc\" >= NaN;",
errors: [{
...comparisonError,
suggestions: []
}]
},
{
code: "123 == Number.NaN;",
errors: [{
...comparisonError,
suggestions: [
{
messageId: "replaceWithIsNaN",
output: "Number.isNaN(123);"
},
{
messageId: "replaceWithCastingAndIsNaN",
output: "Number.isNaN(Number(123));"
}
]
}]
},
{
code: "123 === Number.NaN;",
errors: [{
...comparisonError,
suggestions: [
{
messageId: "replaceWithIsNaN",
output: "Number.isNaN(123);"
}
]
}]
},
{
code: "Number.NaN === \"abc\";",
errors: [{
...comparisonError,
suggestions: [
{
messageId: "replaceWithIsNaN",
output: "Number.isNaN(\"abc\");"
}
]
}]
},
{
code: "Number.NaN == \"abc\";",
errors: [{
...comparisonError,
suggestions: [
{
messageId: "replaceWithIsNaN",
output: 'Number.isNaN("abc");'
},
{
messageId: "replaceWithCastingAndIsNaN",
output: 'Number.isNaN(Number("abc"));'
}
]
}]
},
{
code: "123 != Number.NaN;",
errors: [{
...comparisonError,
suggestions: [
{
messageId: "replaceWithIsNaN",
output: "!Number.isNaN(123);"
},
{
messageId: "replaceWithCastingAndIsNaN",
output: "!Number.isNaN(Number(123));"
}
]
}]
},
{
code: "123 !== Number.NaN;",
errors: [{
...comparisonError,
suggestions: [
{
messageId: "replaceWithIsNaN",
output: "!Number.isNaN(123);"
}
]
}]
},
{
code: "Number.NaN !== \"abc\";",
errors: [{
...comparisonError,
suggestions: [
{
messageId: "replaceWithIsNaN",
output: '!Number.isNaN("abc");'
}
]
}]
},
{
code: "Number.NaN != \"abc\";",
errors: [{
...comparisonError,
suggestions: [
{
messageId: "replaceWithIsNaN",
output: '!Number.isNaN("abc");'
},
{
messageId: "replaceWithCastingAndIsNaN",
output: '!Number.isNaN(Number("abc"));'
}
]
}]
},
{
code: "Number.NaN < \"abc\";",
errors: [{
...comparisonError,
suggestions: []
}]
},
{
code: "\"abc\" < Number.NaN;",
errors: [{
...comparisonError,
suggestions: []
}]
},
{
code: "Number.NaN > \"abc\";",
errors: [{
...comparisonError,
suggestions: []
}]
},
{
code: "\"abc\" > Number.NaN;",
errors: [{
...comparisonError,
suggestions: []
}]
},
{
code: "Number.NaN <= \"abc\";",
errors: [{
...comparisonError,
suggestions: []
}]
},
{
code: "\"abc\" <= Number.NaN;",
errors: [{
...comparisonError,
suggestions: []
}]
},
{
code: "Number.NaN >= \"abc\";",
errors: [{
...comparisonError,
suggestions: []
}]
},
{
code: "\"abc\" >= Number.NaN;",
errors: [{
...comparisonError,
suggestions: []
}]
},
{
code: "x === Number?.NaN;",
languageOptions: { ecmaVersion: 2020 },
errors: [{
...comparisonError,
suggestions: [
{
messageId: "replaceWithIsNaN",
output: "Number.isNaN(x);"
}
]
}]
},
{
code: "x !== Number?.NaN;",
languageOptions: { ecmaVersion: 2020 },
errors: [{
...comparisonError,
suggestions: [
{
messageId: "replaceWithIsNaN",
output: "!Number.isNaN(x);"
}
]
}]
},
{
code: "x === Number['NaN'];",
errors: [{
...comparisonError,
suggestions: [
{
messageId: "replaceWithIsNaN",
output: "Number.isNaN(x);"
}
]
}]
},
{
code: `/* just
adding */ x /* some */ === /* comments */ NaN; // here`,
errors: [{
...comparisonError,
suggestions: [
{
messageId: "replaceWithIsNaN",
output: `/* just
adding */ Number.isNaN(x); // here`
}
]
}]
},
{
code: "(1, 2) === NaN;",
errors: [{
...comparisonError,
suggestions: [
{
messageId: "replaceWithIsNaN",
output: "Number.isNaN((1, 2));"
}
]
}]
},
{
code: "x === (doStuff(), NaN);",
errors: [{
...comparisonError,
suggestions: []
}]
},
{
code: "x === (doStuff(), Number.NaN);",
errors: [{
...comparisonError,
suggestions: []
}]
},
{
code: "x == (doStuff(), NaN);",
errors: [{
...comparisonError,
suggestions: []
}]
},
{
code: "x == (doStuff(), Number.NaN);",
errors: [{
...comparisonError,
suggestions: []
}]
},
//------------------------------------------------------------------------------
// enforceForSwitchCase
//------------------------------------------------------------------------------
{
code: "switch(NaN) { case foo: break; }",
errors: [{ messageId: "switchNaN", type: "SwitchStatement", column: 1 }]
},
{
code: "switch(foo) { case NaN: break; }",
errors: [{ messageId: "caseNaN", type: "SwitchCase", column: 15 }]
},
{
code: "switch(NaN) { case foo: break; }",
options: [{}],
errors: [{ messageId: "switchNaN", type: "SwitchStatement", column: 1 }]
},
{
code: "switch(foo) { case NaN: break; }",
options: [{}],
errors: [{ messageId: "caseNaN", type: "SwitchCase", column: 15 }]
},
{
code: "switch(NaN) {}",
options: [{ enforceForSwitchCase: true }],
errors: [{ messageId: "switchNaN", type: "SwitchStatement", column: 1 }]
},
{
code: "switch(NaN) { case foo: break; }",
options: [{ enforceForSwitchCase: true }],
errors: [{ messageId: "switchNaN", type: "SwitchStatement", column: 1 }]
},
{
code: "switch(NaN) { default: break; }",
options: [{ enforceForSwitchCase: true }],
errors: [{ messageId: "switchNaN", type: "SwitchStatement", column: 1 }]
},
{
code: "switch(NaN) { case foo: break; default: break; }",
options: [{ enforceForSwitchCase: true }],
errors: [{ messageId: "switchNaN", type: "SwitchStatement", column: 1 }]
},
{
code: "switch(foo) { case NaN: }",
options: [{ enforceForSwitchCase: true }],
errors: [{ messageId: "caseNaN", type: "SwitchCase", column: 15 }]
},
{
code: "switch(foo) { case NaN: break; }",
options: [{ enforceForSwitchCase: true }],
errors: [{ messageId: "caseNaN", type: "SwitchCase", column: 15 }]
},
{
code: "switch(foo) { case (NaN): break; }",
options: [{ enforceForSwitchCase: true }],
errors: [{ messageId: "caseNaN", type: "SwitchCase", column: 15 }]
},
{
code: "switch(foo) { case bar: break; case NaN: break; default: break; }",
options: [{ enforceForSwitchCase: true }],
errors: [{ messageId: "caseNaN", type: "SwitchCase", column: 32 }]
},
{
code: "switch(foo) { case bar: case NaN: default: break; }",
options: [{ enforceForSwitchCase: true }],
errors: [{ messageId: "caseNaN", type: "SwitchCase", column: 25 }]
},
{
code: "switch(foo) { case bar: break; case NaN: break; case baz: break; case NaN: break; }",
options: [{ enforceForSwitchCase: true }],
errors: [
{ messageId: "caseNaN", type: "SwitchCase", column: 32 },
{ messageId: "caseNaN", type: "SwitchCase", column: 66 }
]
},
{
code: "switch(NaN) { case NaN: break; }",
options: [{ enforceForSwitchCase: true }],
errors: [
{ messageId: "switchNaN", type: "SwitchStatement", column: 1 },
{ messageId: "caseNaN", type: "SwitchCase", column: 15 }
]
},
{
code: "switch(Number.NaN) { case foo: break; }",
errors: [{ messageId: "switchNaN", type: "SwitchStatement", column: 1 }]
},
{
code: "switch(foo) { case Number.NaN: break; }",
errors: [{ messageId: "caseNaN", type: "SwitchCase", column: 15 }]
},
{
code: "switch(Number.NaN) { case foo: break; }",
options: [{}],
errors: [{ messageId: "switchNaN", type: "SwitchStatement", column: 1 }]
},
{
code: "switch(foo) { case Number.NaN: break; }",
options: [{}],
errors: [{ messageId: "caseNaN", type: "SwitchCase", column: 15 }]
},
{
code: "switch(Number.NaN) {}",
options: [{ enforceForSwitchCase: true }],
errors: [{ messageId: "switchNaN", type: "SwitchStatement", column: 1 }]
},
{
code: "switch(Number.NaN) { case foo: break; }",
options: [{ enforceForSwitchCase: true }],
errors: [{ messageId: "switchNaN", type: "SwitchStatement", column: 1 }]
},
{
code: "switch(Number.NaN) { default: break; }",
options: [{ enforceForSwitchCase: true }],
errors: [{ messageId: "switchNaN", type: "SwitchStatement", column: 1 }]
},
{
code: "switch(Number.NaN) { case foo: break; default: break; }",
options: [{ enforceForSwitchCase: true }],
errors: [{ messageId: "switchNaN", type: "SwitchStatement", column: 1 }]
},
{
code: "switch(foo) { case Number.NaN: }",
options: [{ enforceForSwitchCase: true }],
errors: [{ messageId: "caseNaN", type: "SwitchCase", column: 15 }]
},
{
code: "switch(foo) { case Number.NaN: break; }",
options: [{ enforceForSwitchCase: true }],
errors: [{ messageId: "caseNaN", type: "SwitchCase", column: 15 }]
},
{
code: "switch(foo) { case (Number.NaN): break; }",
options: [{ enforceForSwitchCase: true }],
errors: [{ messageId: "caseNaN", type: "SwitchCase", column: 15 }]
},
{
code: "switch(foo) { case bar: break; case Number.NaN: break; default: break; }",
options: [{ enforceForSwitchCase: true }],
errors: [{ messageId: "caseNaN", type: "SwitchCase", column: 32 }]
},
{
code: "switch(foo) { case bar: case Number.NaN: default: break; }",
options: [{ enforceForSwitchCase: true }],
errors: [{ messageId: "caseNaN", type: "SwitchCase", column: 25 }]
},
{
code: "switch(foo) { case bar: break; case NaN: break; case baz: break; case Number.NaN: break; }",
options: [{ enforceForSwitchCase: true }],
errors: [
{ messageId: "caseNaN", type: "SwitchCase", column: 32 },
{ messageId: "caseNaN", type: "SwitchCase", column: 66 }
]
},
{
code: "switch(Number.NaN) { case Number.NaN: break; }",
options: [{ enforceForSwitchCase: true }],
errors: [
{ messageId: "switchNaN", type: "SwitchStatement", column: 1 },
{ messageId: "caseNaN", type: "SwitchCase", column: 22 }
]
},
{
code: "switch((doStuff(), NaN)) {}",
options: [{ enforceForSwitchCase: true }],
errors: [
{ messageId: "switchNaN", type: "SwitchStatement", column: 1 }
]
},
{
code: "switch((doStuff(), Number.NaN)) {}",
options: [{ enforceForSwitchCase: true }],
errors: [
{ messageId: "switchNaN", type: "SwitchStatement", column: 1 }
]
},
//------------------------------------------------------------------------------
// enforceForIndexOf
//------------------------------------------------------------------------------
{
code: "foo.indexOf(NaN)",
options: [{ enforceForIndexOf: true }],
errors: [{
messageId: "indexOfNaN",
type: "CallExpression",
data: { methodName: "indexOf" },
suggestions: [{
messageId: "replaceWithFindIndex",
data: { methodName: "findIndex" },
output: "foo.findIndex(Number.isNaN)"
}]
}]
},