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cb97e37a92
* chart * index and number-format * char-composition and color * connection * dimension and math-expression * models * query * time-format * residual modules * change config of jest and eslint config * wip update package.json * fix lint * WithLegend import from superset-ui/core
60 lines
2.0 KiB
TypeScript
60 lines
2.0 KiB
TypeScript
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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import { makeSingleton } from '@superset-ui/core';
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describe('makeSingleton()', () => {
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class Dog {
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name: string;
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isSitting?: boolean;
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constructor(name?: string) {
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this.name = name || 'Pluto';
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}
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sit() {
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this.isSitting = true;
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}
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}
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describe('makeSingleton(BaseClass)', () => {
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const getInstance = makeSingleton(Dog);
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it('returns a function for getting singleton instance of a given base class', () => {
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expect(typeof getInstance).toBe('function');
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expect(getInstance()).toBeInstanceOf(Dog);
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});
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it('returned function returns same instance across all calls', () => {
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expect(getInstance()).toBe(getInstance());
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});
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});
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describe('makeSingleton(BaseClass, ...args)', () => {
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const getInstance = makeSingleton(Dog, 'Doug');
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it('returns a function for getting singleton instance of a given base class constructed with the given arguments', () => {
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expect(typeof getInstance).toBe('function');
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expect(getInstance()).toBeInstanceOf(Dog);
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expect(getInstance().name).toBe('Doug');
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});
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it('returned function returns same instance across all calls', () => {
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expect(getInstance()).toBe(getInstance());
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});
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});
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});
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