我在测试此函数 Client.read.pk(string).sk(string)
时遇到了真正的麻烦。我创建了这个类来简化使用 dynamoDB sdk 的过程,但是当我想要单元测试这个方法时,我似乎无法刺痛它!
非常感谢您的帮助!
代码:
export abstract class Client {
static read = {
pk: (pk: string) => {
return {
sk: async (sk: string) => {
return await new DocumentClient()
.get({
TableName: "TodoApp",
Key: {
PK: pk,
SK: sk,
},
})
.promise();
},
};
},
};
}
答案 0 :(得分:1)
由于 Sinon 不支持从模块导入的存根独立函数和类构造函数(DocumentClient
类),因此您需要使用 link seams。我们将使用 proxyquire 来构建接缝。
例如
Client.ts
:
import { DocumentClient } from 'aws-sdk/clients/dynamodb';
export abstract class Client {
static read = {
pk: (pk: string) => {
return {
sk: async (sk: string) => {
return await new DocumentClient()
.get({
TableName: 'TodoApp',
Key: {
PK: pk,
SK: sk,
},
})
.promise();
},
};
},
};
}
Client.test.ts
:
import proxyquire from 'proxyquire';
import sinon from 'sinon';
describe('68430781', () => {
it('should pass', async () => {
const documentClientInstanceStub = {
get: sinon.stub().returnsThis(),
promise: sinon.stub().resolves('mocked data'),
};
const DocumentClientStub = sinon.stub().callsFake(() => documentClientInstanceStub);
const { Client } = proxyquire('./Client', {
'aws-sdk/clients/dynamodb': { DocumentClient: DocumentClientStub },
});
const actual = await Client.read.pk('a').sk('b');
sinon.assert.match(actual, 'mocked data');
sinon.assert.calledOnce(DocumentClientStub);
sinon.assert.calledWithExactly(documentClientInstanceStub.get, {
TableName: 'TodoApp',
Key: {
PK: 'a',
SK: 'b',
},
});
sinon.assert.calledOnce(documentClientInstanceStub.promise);
});
});
单元测试结果:
68430781
✓ should pass (435ms)
1 passing (439ms)
-----------|---------|----------|---------|---------|-------------------
File | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s
-----------|---------|----------|---------|---------|-------------------
All files | 100 | 100 | 100 | 100 |
Client.ts | 100 | 100 | 100 | 100 |
-----------|---------|----------|---------|---------|-------------------