compositearchiveloader.js

/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

'use strict';

const CompositeArchiveLoader = require('../../src/loaders/compositearchiveloader');
const chai = require('chai');
const sinon = require('sinon');

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

describe('CompositeArchiveLoader', () => {

    let compositeLoader;
    let mockLoader1;
    let mockLoader2;

    beforeEach(() => {
        compositeLoader = new CompositeArchiveLoader();
        // Create dummy loaders (The "Employees")
        mockLoader1 = {
            accepts: sinon.stub(),
            load: sinon.stub()
        };
        mockLoader2 = {
            accepts: sinon.stub(),
            load: sinon.stub()
        };
    });

    describe('#constructor', () => {
        it('should start with zero loaders', () => {
            compositeLoader.getArchiveLoaders().should.have.lengthOf(0);
        });
    });

    describe('#addArchiveLoader', () => {
        it('should add loaders to the list', () => {
            compositeLoader.addArchiveLoader(mockLoader1);
            compositeLoader.getArchiveLoaders().should.have.lengthOf(1);
            compositeLoader.addArchiveLoader(mockLoader2);
            compositeLoader.getArchiveLoaders().should.have.lengthOf(2);
        });
    });

    describe('#clearArchiveLoaders', () => {
        it('should remove all loaders', () => {
            compositeLoader.addArchiveLoader(mockLoader1);
            compositeLoader.clearArchiveLoaders();
            compositeLoader.getArchiveLoaders().should.have.lengthOf(0);
        });
    });

    describe('#accepts', () => {
        it('should return true if one of the loaders accepts the URL', () => {
            // Mock: Loader 1 says NO, Loader 2 says YES
            mockLoader1.accepts.returns(false);
            mockLoader2.accepts.returns(true);
            compositeLoader.addArchiveLoader(mockLoader1);
            compositeLoader.addArchiveLoader(mockLoader2);

            const result = compositeLoader.accepts('http://test.url');
            result.should.be.true;
        });

        it('should return false if NONE of the loaders accept the URL', () => {
            mockLoader1.accepts.returns(false);
            mockLoader2.accepts.returns(false);
            compositeLoader.addArchiveLoader(mockLoader1);
            compositeLoader.addArchiveLoader(mockLoader2);

            const result = compositeLoader.accepts('http://test.url');
            result.should.be.false;
        });
    });

    describe('#load', () => {
        it('should delegate load to the first accepting loader', async () => {
            mockLoader1.accepts.returns(false);
            mockLoader2.accepts.returns(true);
            mockLoader2.load.resolves('ARCHIVE_DATA'); // Simulate successful load

            compositeLoader.addArchiveLoader(mockLoader1);
            compositeLoader.addArchiveLoader(mockLoader2);

            const result = await compositeLoader.load('http://test.url', {});
            result.should.equal('ARCHIVE_DATA');
            sinon.assert.calledWith(mockLoader2.load, 'http://test.url', {});
        });

        it('should throw an error if NO loader accepts the URL', () => {
            mockLoader1.accepts.returns(false);
            mockLoader2.accepts.returns(false);

            compositeLoader.addArchiveLoader(mockLoader1);
            compositeLoader.addArchiveLoader(mockLoader2);

            (() => {
                compositeLoader.load('http://unknown.url', {});
            }).should.throw(/Failed to find a model file loader/);
        });
    });
});