e32b4172e4
The rain's column maths and fade colour move from MatrixRain into shell/rain.ts, and the request-once swarm name loader from useSwarmName into shell/swarm-name.ts. Both are plain functions with their input passed in, so tests cover them; the components keep the DOM and canvas work.
60 lines
1.9 KiB
JavaScript
60 lines
1.9 KiB
JavaScript
// The swarm name loader: one request however many callers, and a name that is
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// absent, empty, or failed to load all answer null. Run by `npm test`.
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import assert from "node:assert/strict";
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import { test } from "node:test";
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import { createSwarmNameLoader } from "../src/shell/swarm-name.ts";
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// A fetch that answers `body` as an ok response, counting its calls.
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function fetching(body, ok = true) {
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const f = async (url) => {
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f.calls.push(url);
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return { ok, json: async () => body };
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};
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f.calls = [];
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return f;
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}
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test("the loader answers the configured name", async () => {
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const f = fetching({ name: "constellation" });
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assert.equal(await createSwarmNameLoader(f)(), "constellation");
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assert.deepEqual(f.calls, ["/api/swarm"]);
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});
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test("every caller shares one request", async () => {
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const f = fetching({ name: "constellation" });
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const load = createSwarmNameLoader(f);
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const names = await Promise.all([load(), load(), load()]);
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assert.deepEqual(names, ["constellation", "constellation", "constellation"]);
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assert.equal(f.calls.length, 1);
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});
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test("a null, empty or missing name answers null", async () => {
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for (const body of [{ name: null }, { name: "" }, {}]) {
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assert.equal(await createSwarmNameLoader(fetching(body))(), null);
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}
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});
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test("an error response answers null", async () => {
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assert.equal(
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await createSwarmNameLoader(fetching({ name: "x" }, false))(),
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null,
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);
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});
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test("a failed request answers null rather than throwing", async () => {
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const load = createSwarmNameLoader(async () => {
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throw new Error("offline");
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});
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assert.equal(await load(), null);
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});
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test("a failed request is remembered, not retried by later callers", async () => {
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let calls = 0;
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const load = createSwarmNameLoader(async () => {
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calls += 1;
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throw new Error("offline");
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});
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await load();
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await load();
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assert.equal(calls, 1);
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});
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