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liza/test/error/ChainedErrorTest.ts

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/**
* Tests error chaining
*
* Copyright (C) 2010-2019 R-T Specialty, LLC.
*
* This file is part of the Liza Data Collection Framework.
*
* liza is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import * as sut from "../../src/error/ChainedError";
import { expect } from 'chai';
describe( 'ChainedError', () =>
{
it( "can be created with generic error", () =>
{
const eprev = new Error( "previous error" );
expect( sut.chain( new Error( "new error" ), eprev ).chain )
.to.equal( eprev );
} );
it( "can be chained to arbitrary depth", () =>
{
const e1 = new Error( "lower" );
const e2 = sut.chain( new Error( "mid" ), e1 );
const e3 = sut.chain( new Error( "outer" ), e2 );
expect( sut.isChained( e3 ) ).to.be.true;
expect( sut.isChained( e2 ) ).to.be.true;
expect( sut.isChained( e1 ) ).to.be.false;
} );
it( "provides type predicate for TypeScript", () =>
{
const inner = new Error( "inner" );
// force to Error to discard ChainedError type
const outer: Error = sut.chain( new Error( "outer" ), inner );
if ( sut.isChained( outer ) )
{
// if isChained was properly defined, then outer should now
// have type ChainedError, and so this should compile
expect( outer.chain ).to.equal( inner );
}
else
{
expect.fail();
}
} );
} );