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mock.ts
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mock.ts
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import { createContext } from "./context.ts";
import { join } from "./deps.ts";
import { loadAndFixIndexHtml } from "./html.ts";
import renderer from "./renderer.ts";
import { fetchRouteData, initRoutes } from "./routing.ts";
import type { HTMLRewriterHandlers, Middleware, RouteConfig, SSR } from "./types.ts";
type MockServerOptions = {
appDir?: string;
origin?: string;
routeGlob: string;
middlewares?: Middleware[];
ssr?: SSR;
};
/** The MockServer class to create a minimal server for integration testing.
*
* @example
* ```ts
* import { assertEquals } from "std/testing/asserts.ts";
* import { MockServer } from "aleph/server/mock.ts";
*
* Deno.test(async () => {
* const api = new MockServer({
* routeGlob: "./routes/**\/*.ts"
* });
* const res = await api.fetch("/users?page=1&limit=10");
* assertEquals(res.status, 200);
* assertEquals((await res.json()).length, 10);
* })
* ```
*/
export class MockServer {
#options: MockServerOptions;
#routeConfig: RouteConfig | null;
#indexHtml: Uint8Array | null;
constructor(options: MockServerOptions) {
this.#options = options;
this.#routeConfig = null;
this.#indexHtml = null;
}
async fetch(input: string, init?: RequestInit) {
const { middlewares, ssr, origin, routeGlob, appDir } = 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);
}
}
}
}
if (!this.#routeConfig) {
this.#routeConfig = await initRoutes(routeGlob, appDir);
}
if (!this.#indexHtml) {
this.#indexHtml = await loadAndFixIndexHtml(join(appDir ?? "./", "index.html"), {
ssr: typeof ssr === "function" ? {} : ssr,
});
}
const reqData = req.method === "GET" && url.searchParams.has("_data_");
const res = await fetchRouteData(req, ctx, this.#routeConfig, reqData);
if (res) {
return res;
}
if (!this.#indexHtml) {
return new Response("Not found", { status: 404 });
}
return renderer.fetch(req, ctx, {
indexHtml: this.#indexHtml,
routeConfig: this.#routeConfig,
customHTMLRewriter,
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;
}