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new-cap.js
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new-cap.js
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/**
* @fileoverview Tests for new-cap rule.
* @author Nicholas C. Zakas
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const rule = require("../../../lib/rules/new-cap"),
RuleTester = require("../../../lib/testers/rule-tester");
//------------------------------------------------------------------------------
// Tests
//------------------------------------------------------------------------------
const ruleTester = new RuleTester();
ruleTester.run("new-cap", rule, {
valid: [
"var x = new Constructor();",
"var x = new a.b.Constructor();",
"var x = new a.b['Constructor']();",
"var x = new a.b[Constructor]();",
"var x = new a.b[constructor]();",
"var x = new function(){};",
"var x = new _;",
"var x = new $;",
"var x = new Σ;",
"var x = new _x;",
"var x = new $x;",
"var x = new this;",
"var x = Array(42)",
"var x = Boolean(42)",
"var x = Date(42)",
"var x = Date.UTC(2000, 0)",
"var x = Error('error')",
"var x = Function('return 0')",
"var x = Number(42)",
"var x = Object(null)",
"var x = RegExp(42)",
"var x = String(42)",
"var x = Symbol('symbol')",
"var x = _();",
"var x = $();",
{ code: "var x = Foo(42)", options: [{capIsNew: false}] },
{ code: "var x = bar.Foo(42)", options: [{capIsNew: false}] },
{ code: "var x = Foo.bar(42)", options: [{capIsNew: false}] },
"var x = bar[Foo](42)",
{code: "var x = bar['Foo'](42)", options: [{capIsNew: false}] },
"var x = Foo.bar(42)",
{ code: "var x = new foo(42)", options: [{newIsCap: false}] },
"var o = { 1: function() {} }; o[1]();",
"var o = { 1: function() {} }; new o[1]();",
{ code: "var x = Foo(42);", options: [{ capIsNew: true, capIsNewExceptions: ["Foo"] }] },
{ code: "var x = Foo(42);", options: [{ capIsNewExceptionPattern: "^Foo" }] },
{ code: "var x = new foo(42);", options: [{ newIsCap: true, newIsCapExceptions: ["foo"] }] },
{ code: "var x = new foo(42);", options: [{ newIsCapExceptionPattern: "^foo" }] },
{ code: "var x = Object(42);", options: [{ capIsNewExceptions: ["Foo"] }] },
{ code: "var x = Foo.Bar(42);", options: [{ capIsNewExceptions: ["Bar"] }] },
{ code: "var x = Foo.Bar(42);", options: [{ capIsNewExceptions: ["Foo.Bar"] }] },
{ code: "var x = Foo.Bar(42);", options: [{ capIsNewExceptionPattern: "^Foo\.." }] },
{ code: "var x = new foo.bar(42);", options: [{ newIsCapExceptions: ["bar"] }] },
{ code: "var x = new foo.bar(42);", options: [{ newIsCapExceptions: ["foo.bar"] }] },
{ code: "var x = new foo.bar(42);", options: [{ newIsCapExceptionPattern: "^foo\.." }] },
{ code: "var x = new foo.bar(42);", options: [{ properties: false }] },
{ code: "var x = Foo.bar(42);", options: [{ properties: false }] },
{ code: "var x = foo.Bar(42);", options: [{ capIsNew: false, properties: false }] }
],
invalid: [
{ code: "var x = new c();", errors: [{ message: "A constructor name should not start with a lowercase letter.", type: "NewExpression"}] },
{ code: "var x = new φ;", errors: [{ message: "A constructor name should not start with a lowercase letter.", type: "NewExpression"}] },
{ code: "var x = new a.b.c;", errors: [{ message: "A constructor name should not start with a lowercase letter.", type: "NewExpression"}] },
{ code: "var x = new a.b['c'];", errors: [{ message: "A constructor name should not start with a lowercase letter.", type: "NewExpression"}] },
{ code: "var b = Foo();", errors: [{ message: "A function with a name starting with an uppercase letter should only be used as a constructor.", type: "CallExpression"}] },
{ code: "var b = a.Foo();", errors: [{ message: "A function with a name starting with an uppercase letter should only be used as a constructor.", type: "CallExpression"}] },
{ code: "var b = a['Foo']();", errors: [{ message: "A function with a name starting with an uppercase letter should only be used as a constructor.", type: "CallExpression"}] },
{ code: "var b = a.Date.UTC();", errors: [{ message: "A function with a name starting with an uppercase letter should only be used as a constructor.", type: "CallExpression"}] },
{ code: "var b = UTC();", errors: [{ message: "A function with a name starting with an uppercase letter should only be used as a constructor.", type: "CallExpression"}] },
{
code: "var a = B.C();",
errors: [
{
message: "A function with a name starting with an uppercase letter should only be used as a constructor.",
type: "CallExpression",
line: 1,
column: 11
}
]
},
{
code: "var a = B\n.C();",
errors: [
{
message: "A function with a name starting with an uppercase letter should only be used as a constructor.",
type: "CallExpression",
line: 2,
column: 2
}
]
},
{
code: "var a = new B.c();",
errors: [
{
message: "A constructor name should not start with a lowercase letter.",
type: "NewExpression",
line: 1,
column: 15
}
]
},
{
code: "var a = new B.\nc();",
errors: [
{
message: "A constructor name should not start with a lowercase letter.",
type: "NewExpression",
line: 2,
column: 1
}
]
},
{
code: "var a = new c();",
errors: [
{
message: "A constructor name should not start with a lowercase letter.",
type: "NewExpression",
line: 1,
column: 13
}
]
},
{
code: "var x = Foo.Bar(42);",
options: [{capIsNewExceptions: ["Foo"]}],
errors: [{type: "CallExpression", message: "A function with a name starting with an uppercase letter should only be used as a constructor."}]
},
{
code: "var x = Bar.Foo(42);",
options: [{capIsNewExceptionPattern: "^Foo\.."}],
errors: [{type: "CallExpression", message: "A function with a name starting with an uppercase letter should only be used as a constructor."}]
},
{
code: "var x = new foo.bar(42);",
options: [{newIsCapExceptions: ["foo"]}],
errors: [{type: "NewExpression", message: "A constructor name should not start with a lowercase letter."}]
},
{
code: "var x = new bar.foo(42);",
options: [{newIsCapExceptionPattern: "^foo\.."}],
errors: [{type: "NewExpression", message: "A constructor name should not start with a lowercase letter."}]
}
]
});