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'use strict';
const errcode = require('../index');
const expect = require('expect.js');
describe('errcode', () => {
describe('string as first argument', () => {
it('should throw an error', () => {
expect(() => { errcode('my message'); }).to.throwError((err) => {
expect(err).to.be.a(TypeError);
});
});
});
describe('error as first argument', () => {
it('should accept an error and do nothing', () => {
const myErr = new Error('my message');
const err = errcode(myErr);
expect(err).to.be(myErr);
expect(err.hasOwnProperty(err.code)).to.be(false);
});
it('should accept an error and add a code', () => {
const myErr = new Error('my message');
const err = errcode(myErr, 'ESOME');
expect(err).to.be(myErr);
expect(err.code).to.be('ESOME');
});
it('should accept an error object and add code & properties', () => {
const myErr = new Error('my message');
const err = errcode(myErr, 'ESOME', { foo: 'bar', bar: 'foo' });
expect(err).to.be.an(Error);
expect(err.code).to.be('ESOME');
expect(err.foo).to.be('bar');
expect(err.bar).to.be('foo');
});
it('should create an error object without code but with properties', () => {
const myErr = new Error('my message');
const err = errcode(myErr, { foo: 'bar', bar: 'foo' });
expect(err).to.be.an(Error);
expect(err.code).to.be(undefined);
expect(err.foo).to.be('bar');
expect(err.bar).to.be('foo');
});
it('should set a non-writable field', () => {
const myErr = new Error('my message');
Object.defineProperty(myErr, 'code', {
value: 'derp',
writable: false,
});
const err = errcode(myErr, 'ERR_WAT');
expect(err).to.be.an(Error);
expect(err.stack).to.equal(myErr.stack);
expect(err.code).to.be('ERR_WAT');
});
it('should add a code to frozen object', () => {
const myErr = new Error('my message');
const err = errcode(Object.freeze(myErr), 'ERR_WAT');
expect(err).to.be.an(Error);
expect(err.stack).to.equal(myErr.stack);
expect(err.code).to.be('ERR_WAT');
});
it('should to set a field that throws at assignment time', () => {
const myErr = new Error('my message');
Object.defineProperty(myErr, 'code', {
enumerable: true,
set() {
throw new Error('Nope!');
},
get() {
return 'derp';
},
});
const err = errcode(myErr, 'ERR_WAT');
expect(err).to.be.an(Error);
expect(err.stack).to.equal(myErr.stack);
expect(err.code).to.be('ERR_WAT');
});
it('should retain error type', () => {
const myErr = new TypeError('my message');
Object.defineProperty(myErr, 'code', {
value: 'derp',
writable: false,
});
const err = errcode(myErr, 'ERR_WAT');
expect(err).to.be.a(TypeError);
expect(err.stack).to.equal(myErr.stack);
expect(err.code).to.be('ERR_WAT');
});
it('should add a code to a class that extends Error', () => {
class CustomError extends Error {
set code(val) {
throw new Error('Nope!');
}
}
const myErr = new CustomError('my message');
Object.defineProperty(myErr, 'code', {
value: 'derp',
writable: false,
configurable: false,
});
const err = errcode(myErr, 'ERR_WAT');
expect(err).to.be.a(CustomError);
expect(err.stack).to.equal(myErr.stack);
expect(err.code).to.be('ERR_WAT');
// original prototype chain should be intact
expect(() => {
const otherErr = new CustomError('my message');
otherErr.code = 'derp';
}).to.throwError();
});
it('should support errors that are not Errors', () => {
const err = errcode({
message: 'Oh noes!',
}, 'ERR_WAT');
expect(err.message).to.be('Oh noes!');
expect(err.code).to.be('ERR_WAT');
});
});
describe('falsy first arguments', () => {
it('should not allow passing null as the first argument', () => {
expect(() => { errcode(null); }).to.throwError((err) => {
expect(err).to.be.a(TypeError);
});
});
it('should not allow passing undefined as the first argument', () => {
expect(() => { errcode(undefined); }).to.throwError((err) => {
expect(err).to.be.a(TypeError);
});
});
});
});
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