Function makeReconnect

site/src/utils/reconnectingWebSocket.test.ts:349–378

(random: () => number)

	it("preserves jitter spread after raw backoff exceeds maxMs", () => {
		const makeReconnect = (random: () => number) => {
			let activeSocket = createMockSocket();
			const connect = vi.fn(() => {
				activeSocket = createMockSocket();
				return activeSocket;
			});
			const disconnects: Array<{ reconnect: ReconnectSchedule; now: number }> =
				[];
			const onDisconnect = vi.fn((reconnect: ReconnectSchedule) => {
				disconnects.push({ reconnect, now: Date.now() });
			});

			createReconnectingWebSocket({
				connect,
				onDisconnect,
				baseMs: 1000,
				maxMs: 10000,
				factor: 2,
				jitter: 0.3,
				random,
			});

			for (let i = 0; i < 4; i++) {
				activeSocket.emit("close");
				vi.runOnlyPendingTimers();
			}
			activeSocket.emit("close");

			return disconnects[4]!;
		};

		const minReconnect = makeReconnect(() => 0);
		expectReconnectSchedule(minReconnect, { attempt: 5, delayMs: 7000 });