[英]Jest: Logic issue in testing a function
我想测试一个名为 getRunningContainers 的函数,它基本上返回我系统上所有正在运行的容器。 它在内部使用了两个名为 listContainers 和 getContainer 的函数来工作。
async getRunningContainers(): Promise<ContainerInspectInfo[] | undefined> {
const runningContainers: ContainerInspectInfo[] = [];
const opts: any = {
filters: {
status: ['running'],
},
};
try {
const containers: ContainerInfo[] = await this.client.listContainers(
opts
);
for (const c of containers) {
const container: ContainerInterface = await this.client.getContainer(
c.Id
);
const containerInspect: ContainerInspectInfo = await container.inspect();
runningContainers.push(containerInspect);
}
return runningContainers;
} catch (err) {
console.log(`running containers error: ${err}`);
return;
}
}
我正在编写以下 Jest 测试,其中 dummy_container 是一个表示容器的对象,dummy_container_response 是一个相同的数组,dummy_info 是一个表示 ContainerInspectInfo 的对象。 我从 getRunningContainer 返回undefined ,我似乎无法找出原因。
describe('Container Client', () => {
let containerData = dummy_container_responses;
const MockDockerClient = {
listContainers: (opts: any) => new Promise((resolve, reject) => {
resolve(dummy_info);
}),
createContainer: (opts:any) => new Promise((resolve, reject)=> {
resolve(dummy_container);
}),
getContainer: (id: any) => new Promise((resolve, reject) => {
resolve(dummy_container)
})
}
const containerClient = new Container(MockDockerClient);
test('starting a container', async() => {
const container = await containerClient.create(dummy_container);
const containers = await containerClient.getRunningContainers()
expect(containers).toEqual(dummy_container)
})
})
我不确定是否需要更多信息,所以请随时告诉我是否需要。 谢谢!
import {
Container as ContainerInterface,
ContainerCreateOptions,
ContainerInfo,
ContainerInspectInfo,
HostConfig,
} from 'dockerode';
export class Container {
client: any;
constructor(client: any) {
this.client = client;
}
async create(
opts: any
): Promise<ContainerInterface | undefined> {
let container: ContainerInterface;
const { name, Image, Cmd, HostConfig, Labels, Entrypoint, Env } = opts;
try {
const createOpts: ContainerCreateOptions = {
name,
Image,
Cmd,
HostConfig,
Labels,
Entrypoint,
Env,
};
container = await this.client.createContainer(createOpts);
return container;
} catch (err) {
console.log(`create container error: ${err}`);
return;
}
}
async getRunningContainers(): Promise<ContainerInspectInfo[] | undefined> {
const runningContainers: ContainerInspectInfo[] = [];
const opts: any = {
filters: {
status: ['running'],
},
};
try {
const containers: ContainerInfo[] = await this.client.listContainers(
opts
);
for (const c of containers) {
const container: ContainerInterface = await this.client.getContainer(
c.Id
);
const containerInspect: ContainerInspectInfo = await container.inspect();
runningContainers.push(containerInspect);
}
return runningContainers;
} catch (err) {
console.log(`running containers error: ${err}`);
return;
}
}
static newContainerConfig(
oldContainer: ContainerInspectInfo,
newImage: string
): ContainerCreateOptions {
const config: ContainerCreateOptions = {
name: oldContainer['Name'].replace('/', ''),
Image: newImage,
Cmd: oldContainer['Config']['Cmd'],
HostConfig: oldContainer['HostConfig'],
Labels: oldContainer['Config']['Labels'],
Entrypoint: oldContainer['Config']['Entrypoint'],
Env: oldContainer['Config']['Env'],
};
return config;
}
}
由于您的dummy_container
是 JSON - 您可能希望在MockDockerContainer
实现您的getContainer
方法, MockDockerContainer
所示:
const MockDockerClient = {
// ... current implementation ...
getContainer: (id: any) => new Promise((resolve, reject) => {
resolve({
inspect: () => new Promise(res => res(dummy_container)),
});
})
}
这是因为您正在等待 getContainer().inspect() 的结果 - 所以 inspect() 需要是一个基于异步/承诺的函数,它返回您期望的内容。 我假设这是您的容器的 JSON - 但这可能是错误的。
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