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inherits is used in lib and tests but its functionality itself is not tested yet. PR-URL: https://github.com/nodejs/node/pull/3507 Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
47 lines
1.1 KiB
JavaScript
47 lines
1.1 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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// 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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// should throw with invalid arguments
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assert.throws(function() { inherits(A, {}); }, TypeError);
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assert.throws(function() { inherits(A, null); }, TypeError);
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assert.throws(function() { inherits(null, A); }, TypeError);
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