Created
March 7, 2021 22:53
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This is an example showing how Deno's Oak can be tested without network connections
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| import type { | |
| Server, | |
| ServerRequest, | |
| ServerResponse, | |
| } from "https://deno.land/x/oak@v6.5.0/types.d.ts"; | |
| import { | |
| Application, | |
| ListenOptions, | |
| } from "https://deno.land/x/oak@v6.5.0/mod.ts"; | |
| class MockServer { | |
| serverClosed = false; | |
| requestStack: ServerRequest[]; | |
| constructor(requestStack: ServerRequest[]) { | |
| this.requestStack = requestStack; | |
| } | |
| close(): void { | |
| this.serverClosed = true; | |
| } | |
| async *[Symbol.asyncIterator]() { | |
| for await (const request of this.requestStack) { | |
| yield request; | |
| } | |
| } | |
| } | |
| /** | |
| * Make a mock Oak application that can process requests | |
| * and middleware for testing purposes. | |
| * | |
| * ```js | |
| * const app = new MockApplication(); | |
| * app.use(middleware); | |
| * app.makeRequest("/" | |
| * ``` | |
| */ | |
| export class MockApplication extends Application { | |
| requestStack: ServerRequest[] = []; | |
| responseStack: ServerResponse[] = []; | |
| constructor() { | |
| super({ | |
| serve: (addr: string | ListenOptions): Server => { | |
| return new MockServer(this.requestStack) as Server; | |
| } | |
| }); | |
| } | |
| makeRequest( | |
| url = "/", | |
| headersInit: string[][] = [["host", "example.com"]] | |
| ) { | |
| this.requestStack.push({ | |
| url, | |
| headers: new Headers(headersInit), | |
| respond: (response: ServerResponse) => { | |
| this.responseStack.push(response); | |
| return Promise.resolve(); | |
| }, | |
| proto: "HTTP/1.1" | |
| } as any); | |
| } | |
| async listen() { | |
| // this port doesn't actually get used | |
| await super.listen(":1337") | |
| while (this.requestStack.pop()) {}; | |
| } | |
| } | |
| Deno.test("MockApplication can be used to test middleware.", async function() { | |
| const app = new MockApplication(); | |
| let middlewareCalled = 0; | |
| app.use((ctx: Context, next: () => Promise<void>) => { | |
| middlewareCalled += 1; | |
| }) | |
| app.makeRequest(); | |
| await app.listen(); | |
| assertEquals(middlewareCalled, 1); | |
| app.makeRequest(); | |
| await app.listen(); | |
| assertEquals(middlewareCalled, 2); | |
| }) |
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