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7c51240b1a
ESLint 4.x has stricter linting than previous versions. We are currently using the legacy indentation rules in the test directory. This commit changes the indentation of files to comply with the stricter 4.x linting and enable stricter linting in the test directory. Backport-PR-URL: https://github.com/nodejs/node/pull/14522 Backport-Reviewed-By: Anna Henningsen <anna@addaleax.net> PR-URL: https://github.com/nodejs/node/pull/14431 Reviewed-By: Refael Ackermann <refack@gmail.com> Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com> Reviewed-By: Trevor Norris <trev.norris@gmail.com>
90 lines
2.0 KiB
JavaScript
90 lines
2.0 KiB
JavaScript
'use strict';
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require('../common');
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const assert = require('assert');
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const inherits = require('util').inherits;
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const errCheck =
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/^TypeError: The super constructor to "inherits" must not be null or undefined$/;
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// super constructor
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function A() {
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this._a = 'a';
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}
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A.prototype.a = function() { return this._a; };
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// one level of inheritance
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function B(value) {
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A.call(this);
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this._b = value;
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}
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inherits(B, A);
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B.prototype.b = function() { return this._b; };
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assert.strictEqual(B.super_, A);
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const b = new B('b');
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assert.strictEqual(b.a(), 'a');
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assert.strictEqual(b.b(), 'b');
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assert.strictEqual(b.constructor, B);
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// two levels of inheritance
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function C() {
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B.call(this, 'b');
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this._c = 'c';
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}
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inherits(C, B);
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C.prototype.c = function() { return this._c; };
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C.prototype.getValue = function() { return this.a() + this.b() + this.c(); };
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assert.strictEqual(C.super_, B);
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const c = new C();
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assert.strictEqual(c.getValue(), 'abc');
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assert.strictEqual(c.constructor, C);
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// inherits can be called after setting prototype properties
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function D() {
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C.call(this);
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this._d = 'd';
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}
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D.prototype.d = function() { return this._d; };
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inherits(D, C);
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assert.strictEqual(D.super_, C);
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const d = new D();
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assert.strictEqual(d.c(), 'c');
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assert.strictEqual(d.d(), 'd');
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assert.strictEqual(d.constructor, D);
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// ES6 classes can inherit from a constructor function
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class E {
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constructor() {
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D.call(this);
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this._e = 'e';
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}
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e() { return this._e; }
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}
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inherits(E, D);
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assert.strictEqual(E.super_, D);
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const e = new E();
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assert.strictEqual(e.getValue(), 'abc');
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assert.strictEqual(e.d(), 'd');
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assert.strictEqual(e.e(), 'e');
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assert.strictEqual(e.constructor, E);
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// should throw with invalid arguments
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assert.throws(function() {
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inherits(A, {});
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}, /^TypeError: The super constructor to "inherits" must have a prototype$/);
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assert.throws(function() {
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inherits(A, null);
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}, errCheck);
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assert.throws(function() {
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inherits(null, A);
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}, /^TypeError: The constructor to "inherits" must not be null or undefined$/);
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