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liza/test/error/ContextErrorTest.ts

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/**
* Tests error context
*
* 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/ContextError";
import { expect } from 'chai';
describe( 'ContextError', () =>
{
it( "can be created with generic error", () =>
{
const context = { foo: "context" };
expect( sut.context( new Error( "test error" ), context ).context )
.to.equal( context );
} );
it( "provides type predicate for TypeScript", () =>
{
const context = { bar: "baz context" };
// force to Error to discard ContextError type
const e: Error = sut.context( new Error( "test error" ), context );
if ( sut.hasContext( e ) )
{
// if isChained was properly defined, then outer should now
// have type ChainedError, and so this should compile
expect( e.context ).to.equal( context );
}
else
{
expect.fail();
}
} );
it( "can create typed contexts", () =>
{
type FooErrorContext = { foo: string };
// this is the actual test
const e: sut.ContextError<FooErrorContext> =
sut.context( new Error( "test error" ), { foo: "context" } );
// contravariance check (would fail to compile)
expect( sut.hasContext( e ) ).to.be.true;
} );
} );