liza/test/store/CascadingTest.js

/**
 * Test case for Cascading store
 *
 *  Copyright (C) 2016 LoVullo Associates, Inc.
 *
 *  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 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 General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

"use strict";

var store  = require( '../../' ).store,
    chai   = require( 'chai' ),
    expect = chai.expect,
    Store  = store.MemoryStore,
    Sut    = store.Cascading;

chai.use( require( 'chai-as-promised' ) );


describe( 'store.Cascading', () =>
{
    describe( '#add', () =>
    {
        it( 'does not allow attaching non-store objects', () =>
        {
            expect( Store.use( Sut )().add( 'invalid', {} ) )
                .to.be.rejectedWith( TypeError );
        } );


        it( 'allows attaching Store objects', () =>
        {
            return Store.use( Sut )().add( 'valid', Store() );
        } );
    } );


    describe( '#clear', () =>
    {
        it( 'invokes #clear on all contained stores', () =>
        {
            const cleared = [];

            const MockStore = Store.extend(
            {
                'override clear'()
                {
                    cleared.push( this.__inst );

                    return Promise.resolve( true );
                }
            } );

            const stores = [ 1, 2, 3 ].map( () => MockStore() );
            const sut    = Store.use( Sut )();

            stores.forEach( ( store, i ) => sut.add( i, store ) );

            // should trigger clear on all stores
            return sut.clear()
                .then( () =>
                {
                    expect(
                        stores.every( store =>
                            cleared.some( item => item === store )
                        )
                    ).to.be.true;
                } );
        } );


        it( 'does not clear self', () =>
        {
            const sut      = Store.use( Sut )();
            const substore = Store();

            return sut.add( 'foo', substore )
                .then( () => sut.clear() )
                .then( () => {
                    return expect( sut.get( 'foo' ) )
                        .to.eventually.equal( substore )
                } );
        } );


        [
            [ [ true, true, true ], true ],
            [ [ true, true, false ], false ],
            [ [ false, true, true ], false ],
            [ [ false, false, false ], false ],
        ].forEach( testdata =>
        {
            let clears   = testdata[ 0 ],
                expected = testdata[ 1 ];

            it( 'fails if any store fails to clear', () =>
            {
                let StubStore = Store.extend(
                {
                    _result: false,

                    __construct( result )
                    {
                        this._result = result;
                    },

                    'override clear'()
                    {
                        return Promise.resolve( this._result );
                    },
                } );

                let sut = Store.use( Sut )();

                clears.forEach( ( result, i ) =>
                {
                    sut.add( i, StubStore( result ) );
                } );

                return sut.clear()
                    .then( result => expect( result ).to.equal( expected ) );
            } );
        } );
    } );
} );