/
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");
//------------------------------------------------------------------------------
// 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) { }",
//------------------------------------------------------------------------------
// enforceForSwitchCase
//------------------------------------------------------------------------------
"switch(NaN) { case foo: break; }",
"switch(foo) { case NaN: break; }",
{
code: "switch(NaN) { case foo: break; }",
options: [{}]
},
{
code: "switch(foo) { case NaN: break; }",
options: [{}]
},
{
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 }]
},
//------------------------------------------------------------------------------
// enforceForIndexOf
//------------------------------------------------------------------------------
"foo.indexOf(NaN)",
"foo.lastIndexOf(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 }],
parserOptions: { ecmaVersion: 6 }
},
{
code: "foo.lastIndexOf(NaN())",
options: [{ enforceForIndexOf: true }]
}
],
invalid: [
{
code: "123 == NaN;",
errors: [comparisonError]
},
{
code: "123 === NaN;",
errors: [comparisonError]
},
{
code: "NaN === \"abc\";",
errors: [comparisonError]
},
{
code: "NaN == \"abc\";",
errors: [comparisonError]
},
{
code: "123 != NaN;",
errors: [comparisonError]
},
{
code: "123 !== NaN;",
errors: [comparisonError]
},
{
code: "NaN !== \"abc\";",
errors: [comparisonError]
},
{
code: "NaN != \"abc\";",
errors: [comparisonError]
},
{
code: "NaN < \"abc\";",
errors: [comparisonError]
},
{
code: "\"abc\" < NaN;",
errors: [comparisonError]
},
{
code: "NaN > \"abc\";",
errors: [comparisonError]
},
{
code: "\"abc\" > NaN;",
errors: [comparisonError]
},
{
code: "NaN <= \"abc\";",
errors: [comparisonError]
},
{
code: "\"abc\" <= NaN;",
errors: [comparisonError]
},
{
code: "NaN >= \"abc\";",
errors: [comparisonError]
},
{
code: "\"abc\" >= NaN;",
errors: [comparisonError]
},
//------------------------------------------------------------------------------
// enforceForSwitchCase
//------------------------------------------------------------------------------
{
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 }
]
},
//------------------------------------------------------------------------------
// enforceForIndexOf
//------------------------------------------------------------------------------
{
code: "foo.indexOf(NaN)",
options: [{ enforceForIndexOf: true }],
errors: [{ messageId: "indexOfNaN", type: "CallExpression", data: { methodName: "indexOf" } }]
},
{
code: "foo.lastIndexOf(NaN)",
options: [{ enforceForIndexOf: true }],
errors: [{ messageId: "indexOfNaN", type: "CallExpression", data: { methodName: "lastIndexOf" } }]
},
{
code: "foo['indexOf'](NaN)",
options: [{ enforceForIndexOf: true }],
errors: [{ messageId: "indexOfNaN", type: "CallExpression", data: { methodName: "indexOf" } }]
},
{
code: "foo['lastIndexOf'](NaN)",
options: [{ enforceForIndexOf: true }],
errors: [{ messageId: "indexOfNaN", type: "CallExpression", data: { methodName: "lastIndexOf" } }]
},
{
code: "foo().indexOf(NaN)",
options: [{ enforceForIndexOf: true }],
errors: [{ messageId: "indexOfNaN", type: "CallExpression", data: { methodName: "indexOf" } }]
},
{
code: "foo.bar.lastIndexOf(NaN)",
options: [{ enforceForIndexOf: true }],
errors: [{ messageId: "indexOfNaN", type: "CallExpression", data: { methodName: "lastIndexOf" } }]
}
]
});