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[英]How to use an abstract class as the type of a React component in TypeScript?
[英]How to use jest for testing abstract class in typescript?
嗨,我試圖用玩笑來測試 Abstract class。 但是,當嘗試這樣做時。 我收到語法錯誤。 我嘗試使用 type: module 導入 cosmos 依賴項在 package.json 添加 type:module 時出現此錯誤
import { Constants, CosmosClient, ErrorResponse, FeedOptions, FeedResponse, ItemResponse, SqlQuerySpec, StatusCodes } from '@azure/cosmos';
/**
* Abstract class with general CosmosDB utilities and wrappers.
*/
export abstract class AbstractCosmosService {
// TODO: Cannot be abstract yet: microsoft/TypeScript#34516
protected static CONNECTION_STRING: string;
protected static get dbClient(): CosmosClient {
return new CosmosClient(this.CONNECTION_STRING);
}
protected static recordRequestCharge(response: any): void {
if (typeof response === 'object' && response && response.hasOwnProperty('requestCharge')) {
// TODO: record request charge somehow
}
}
您可以繞過 TSC 的類型檢查來執行這些方法。 您應該使用括號表示法而不是使用點表示法屬性訪問器。
例如
index.ts
:
import { CosmosClient } from '@azure/cosmos';
/**
* Abstract class with general CosmosDB utilities and wrappers.
*/
export abstract class AbstractCosmosService {
// TODO: Cannot be abstract yet: microsoft/TypeScript#34516
protected static CONNECTION_STRING: string;
protected static get dbClient(): CosmosClient {
return new CosmosClient(this.CONNECTION_STRING);
}
protected static recordRequestCharge(response: any): void {
if (typeof response === 'object' && response && response.hasOwnProperty('requestCharge')) {
// TODO: record request charge somehow
console.log('record request charge somehow');
}
}
}
index.test.ts
:
import { AbstractCosmosService } from './';
import { CosmosClient } from '@azure/cosmos';
jest.mock('@azure/cosmos', () => {
return { CosmosClient: jest.fn() };
});
describe('62896064', () => {
describe('#recordRequestCharge', () => {
it('should pass', () => {
const logSpy = jest.spyOn(console, 'log');
const response = { requestCharge: '' };
AbstractCosmosService['recordRequestCharge'](response);
expect(logSpy).toBeCalledWith('record request charge somehow');
});
});
describe('#dbClient', () => {
it('should pass', () => {
AbstractCosmosService['CONNECTION_STRING'] = 'localhost:5432';
AbstractCosmosService['dbClient'];
expect(CosmosClient).toBeCalledWith('localhost:5432');
});
});
});
帶有覆蓋率報告的單元測試結果:
PASS stackoverflow/62896064/index.test.ts (11.586s)
62896064
#recordRequestCharge
✓ should pass (16ms)
#dbClient
✓ should pass
console.log
record request charge somehow
at CustomConsole.<anonymous> (node_modules/jest-environment-enzyme/node_modules/jest-mock/build/index.js:866:25)
----------|---------|----------|---------|---------|-------------------
File | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s
----------|---------|----------|---------|---------|-------------------
All files | 100 | 80 | 100 | 100 |
index.ts | 100 | 80 | 100 | 100 | 15
----------|---------|----------|---------|---------|-------------------
Test Suites: 1 passed, 1 total
Tests: 2 passed, 2 total
Snapshots: 0 total
Time: 13.137s
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