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mock.ts
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mock.ts
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import { createContext } from "./context.ts";
import { globalIt, loadImportMap } from "./helpers.ts";
import { loadAndFixIndexHtml } from "./html.ts";
import renderer, { type SSR } from "./renderer.ts";
import { fetchData, initRoutes } from "./routing.ts";
import type { Middleware, RoutesConfig } from "./types.ts";
type MockServerOptions = {
routes: string | RoutesConfig;
middlewares?: Middleware[];
ssr?: SSR;
origin?: string;
};
/** The MockServer class to create a minimal server for integration testing.
*
* ```ts
* import { assertEquals } from "std/testing/asserts.ts";
* import { MockServer } from "aleph/server/mock.ts";
*
* Deno.test(async () => {
* const api = new MockServer({
* routes: "./routes/**\/*.ts"
* });
* const res = await api.fetch("/users")
* assertEquals(res.status, 200);
* assertEquals((await res.json()).length, 50);
* })
* ```
*/
export class MockServer {
#options: MockServerOptions;
constructor({ routes, middlewares }: MockServerOptions) {
this.#options = { routes, middlewares };
}
async fetch(input: string, init?: RequestInit) {
const { middlewares, routes, ssr, origin } = this.#options;
const url = new URL(input, origin ?? "http://localhost/");
const req = new Request(url.href, init);
const customHTMLRewriter: [selector: string, handlers: HTMLRewriterHandlers][] = [];
const ctx = createContext(req, { customHTMLRewriter });
// use middlewares
if (middlewares) {
for (let i = 0, l = middlewares.length; i < l; i++) {
const mw = middlewares[i];
const handler = mw.fetch;
if (typeof handler === "function") {
try {
let res = handler(req, ctx);
if (res instanceof Promise) {
res = await res;
}
if (res instanceof Response) {
return res;
}
if (typeof res === "function") {
setTimeout(res, 0);
}
} catch (err) {
throw new Error(`Middleare${mw.name ? `(${mw.name})` : ""}:`, err);
}
}
}
}
const [routeRecord, importMap] = await globalIt(
Deno.cwd() + JSON.stringify(routes),
() => {
return Promise.all([initRoutes(routes), loadImportMap()]);
},
);
const res = await fetchData(routeRecord.routes, url, req, ctx, true, true);
if (res) {
return res;
}
const indexHtml = await loadAndFixIndexHtml({
importMap,
ssr: typeof ssr === "function" ? {} : ssr,
isDev: false,
});
return renderer.fetch(req, ctx, {
indexHtml,
routeRecord,
customHTMLRewriter,
isDev: false,
ssr,
});
}
}
/** mock a `FormData` object. */
export function mockFormData(init?: Record<string, string | Blob | [filename: string, content: Blob]>): FormData {
const data = new FormData();
if (init) {
for (const [key, value] of Object.entries(init)) {
if (Array.isArray(value)) {
data.append(key, value[1], value[0]);
} else {
data.append(key, value);
}
}
}
return data;
}