64 lines
1.9 KiB
TypeScript
64 lines
1.9 KiB
TypeScript
import 'mocha';
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import { expect } from 'chai';
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import { ApplicationFactory, ApplicationGetterType } from '@/application/ApplicationFactory';
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import { ApplicationStub } from '@tests/unit/shared/Stubs/ApplicationStub';
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import { itEachAbsentObjectValue } from '@tests/unit/shared/TestCases/AbsentTests';
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describe('ApplicationFactory', () => {
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describe('ctor', () => {
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describe('throws if getter is absent', () => {
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itEachAbsentObjectValue((absentValue) => {
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// arrange
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const expectedError = 'missing getter';
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const getter: ApplicationGetterType = absentValue;
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// act
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const act = () => new SystemUnderTest(getter);
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// assert
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expect(act).to.throw(expectedError);
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});
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});
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});
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describe('getApp', () => {
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it('returns result from the getter', async () => {
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// arrange
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const expected = new ApplicationStub();
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const getter: ApplicationGetterType = () => expected;
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const sut = new SystemUnderTest(getter);
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// act
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const actual = await Promise.all([
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sut.getApp(),
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sut.getApp(),
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sut.getApp(),
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sut.getApp(),
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]);
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// assert
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expect(actual.every((value) => value === expected));
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});
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it('only executes getter once', async () => {
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// arrange
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let totalExecution = 0;
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const expected = new ApplicationStub();
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const getter: ApplicationGetterType = () => {
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totalExecution++;
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return expected;
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};
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const sut = new SystemUnderTest(getter);
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// act
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await Promise.all([
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sut.getApp(),
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sut.getApp(),
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sut.getApp(),
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sut.getApp(),
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]);
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// assert
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expect(totalExecution).to.equal(1);
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});
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});
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});
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class SystemUnderTest extends ApplicationFactory {
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public constructor(costlyGetter: ApplicationGetterType) {
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super(costlyGetter);
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}
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}
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