eslint-plugin-babel/tests/rules/new-cap.js

/* eslint-disable */

/**
 * @fileoverview Tests for new-cap rule.
 * @author Nicholas C. Zakas
 */

var rule = require('../../rules/new-cap'),
    RuleTester = require('../RuleTester');

var ruleTester = new RuleTester();
ruleTester.run('babel/new-cap', rule, {
    valid: [
        // Original test cases.
        "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 }] },

        // Babel-specific test cases.
        { code: "@MyDecorator(123) class MyClass{}", parser: "babel-eslint" },
    ],
    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." }]
        }
    ]
});