explorer: Add missing onDestroy hooks to stop polling

Resolves #1749

explorer/src/lib/containers/__tests__/StatisticsPanel.spec.js

@@ -0,0 +1,75 @@
+import { afterAll, afterEach, describe, expect, it, vi } from "vitest";
+import { cleanup, render } from "@testing-library/svelte";
+import { get } from "svelte/store";
+
+import { duskAPI } from "$lib/services";
+import { appStore } from "$lib/stores";
+import { apiMarketData, apiNodeLocations, apiStats } from "$lib/mock-data";
+
+import { StatisticsPanel } from "..";
+
+describe("StatisticsPanel", () => {
+  vi.useFakeTimers();
+
+  const STATS_FETCH_INTERVAL = 5000;
+  const { network } = get(appStore);
+  const getMarketDataSpy = vi
+    .spyOn(duskAPI, "getMarketData")
+    .mockResolvedValue({
+      currentPrice: apiMarketData.market_data.current_price,
+      marketCap: apiMarketData.market_data.market_cap,
+    });
+  const getNodeLocationsSpy = vi
+    .spyOn(duskAPI, "getNodeLocations")
+    .mockResolvedValue(apiNodeLocations.data);
+  const getStatsSpy = vi.spyOn(duskAPI, "getStats").mockResolvedValue(apiStats);
+
+  afterEach(() => {
+    cleanup();
+    getMarketDataSpy.mockClear();
+    getNodeLocationsSpy.mockClear();
+    getStatsSpy.mockClear();
+  });
+
+  afterAll(() => {
+    vi.useRealTimers();
+    getMarketDataSpy.mockRestore();
+    getNodeLocationsSpy.mockRestore();
+    getStatsSpy.mockRestore();
+  });
+
+  it("should render the StatisticsPanel, query for the necessary info, start polling for stats and stop the polling when unmounted", async () => {
+    const { container, unmount } = render(StatisticsPanel);
+
+    expect(container.firstChild).toMatchSnapshot();
+    expect(getMarketDataSpy).toHaveBeenCalledTimes(1);
+    expect(getMarketDataSpy).toHaveBeenNthCalledWith(1, network);
+    expect(getNodeLocationsSpy).toHaveBeenCalledTimes(1);
+    expect(getNodeLocationsSpy).toHaveBeenNthCalledWith(1, network);
+    expect(getStatsSpy).toHaveBeenCalledTimes(1);
+    expect(getStatsSpy).toHaveBeenNthCalledWith(1, network);
+
+    await vi.advanceTimersByTimeAsync(1);
+
+    // snapshot with received data from APIs
+    expect(container.firstChild).toMatchSnapshot();
+
+    await vi.advanceTimersByTimeAsync(STATS_FETCH_INTERVAL - 1);
+
+    expect(getStatsSpy).toHaveBeenCalledTimes(2);
+    expect(getStatsSpy).toHaveBeenNthCalledWith(2, network);
+
+    await vi.advanceTimersByTimeAsync(STATS_FETCH_INTERVAL);
+
+    expect(getStatsSpy).toHaveBeenCalledTimes(3);
+    expect(getStatsSpy).toHaveBeenNthCalledWith(3, network);
+
+    unmount();
+
+    await vi.advanceTimersByTimeAsync(STATS_FETCH_INTERVAL * 10);
+
+    expect(getStatsSpy).toHaveBeenCalledTimes(3);
+    expect(getNodeLocationsSpy).toHaveBeenCalledTimes(1);
+    expect(getMarketDataSpy).toHaveBeenCalledTimes(1);
+  });
+});