Initial Commit

packages/networking/network/react-network-libp2p-demo/tests/setup/fake-node.ts

@@ -0,0 +1,126 @@
+import type {
+    DemoPeerEvent,
+    DemoSubscription,
+    Libp2pDemoNode,
+    Libp2pDemoNodeConfig,
+    Libp2pDemoNodeFactory,
+} from "../../src/hooks/use-libp2p-demo/use-libp2p-demo.types.js";
+
+/**
+ * Deterministic fake `Libp2pDemoNode` used across the unit test suite.
+ * No mocks, no spies — just a real implementation of the structural
+ * contract that records calls and exposes typed event emitters.
+ */
+export interface FakeNodeOptions {
+    readonly peerId?: string;
+    readonly listenAddresses?: readonly string[];
+    readonly dialResult?: string;
+    readonly pingResult?: number;
+    readonly echoResult?: string;
+    readonly throwOnStart?: Error;
+    readonly throwOnStop?: Error;
+    readonly throwOnDial?: Error;
+    readonly throwOnPing?: Error;
+    readonly throwOnEcho?: Error;
+}
+
+export interface FakeNode extends Libp2pDemoNode {
+    readonly emitDiscovery: (evt: DemoPeerEvent) => void;
+    readonly emitConnect: (evt: DemoPeerEvent) => void;
+    readonly emitDisconnect: (evt: DemoPeerEvent) => void;
+    readonly startedCount: () => number;
+    readonly stoppedCount: () => number;
+    readonly lastConfig: () => Libp2pDemoNodeConfig | null;
+}
+
+export function createFakeNode(options: FakeNodeOptions = {}): FakeNode {
+    const discoveryHandlers = new Set<(evt: DemoPeerEvent) => void>();
+    const connectHandlers = new Set<(evt: DemoPeerEvent) => void>();
+    const disconnectHandlers = new Set<(evt: DemoPeerEvent) => void>();
+    let starts = 0;
+    let stops = 0;
+    let lastConfig: Libp2pDemoNodeConfig | null = null;
+
+    const sub =
+        (set: Set<(evt: DemoPeerEvent) => void>) =>
+        (handler: (evt: DemoPeerEvent) => void): DemoSubscription => {
+            set.add(handler);
+            return {
+                unsubscribe: () => {
+                    set.delete(handler);
+                },
+            };
+        };
+
+    const node: FakeNode = {
+        peerId: options.peerId ?? "12D3KooWFakeNode",
+        listenAddresses: options.listenAddresses ?? ["/ip4/127.0.0.1/tcp/0"],
+        start: async () => {
+            starts += 1;
+            if (options.throwOnStart) throw options.throwOnStart;
+        },
+        stop: async () => {
+            stops += 1;
+            if (options.throwOnStop) throw options.throwOnStop;
+        },
+        dial: async (_addr, opts) => {
+            if (opts?.signal?.aborted)
+                throw opts.signal.reason ?? new Error("aborted");
+            if (options.throwOnDial) throw options.throwOnDial;
+            return options.dialResult ?? "12D3KooWFakeRemote";
+        },
+        ping: async (_target, opts) => {
+            if (opts?.signal?.aborted)
+                throw opts.signal.reason ?? new Error("aborted");
+            if (options.throwOnPing) throw options.throwOnPing;
+            return options.pingResult ?? 42;
+        },
+        echo: async (_target, message, opts) => {
+            if (opts?.signal?.aborted)
+                throw opts.signal.reason ?? new Error("aborted");
+            if (options.throwOnEcho) throw options.throwOnEcho;
+            return options.echoResult ?? message;
+        },
+        onPeerDiscovery: sub(discoveryHandlers),
+        onPeerConnect: sub(connectHandlers),
+        onPeerDisconnect: sub(disconnectHandlers),
+        emitDiscovery: (evt) => {
+            for (const h of discoveryHandlers) h(evt);
+        },
+        emitConnect: (evt) => {
+            for (const h of connectHandlers) h(evt);
+        },
+        emitDisconnect: (evt) => {
+            for (const h of disconnectHandlers) h(evt);
+        },
+        startedCount: () => starts,
+        stoppedCount: () => stops,
+        lastConfig: () => lastConfig,
+    };
+
+    // Expose a setter via a separate factory so the holder for lastConfig
+    // is captured by the factory closure below.
+    (
+        node as { _setLastConfig?: (c: Libp2pDemoNodeConfig) => void }
+    )._setLastConfig = (c: Libp2pDemoNodeConfig) => {
+        lastConfig = c;
+    };
+
+    return node;
+}
+
+export function fakeNodeFactory(
+    nodeOrOptions: FakeNode | FakeNodeOptions = {}
+): Libp2pDemoNodeFactory {
+    return async (config) => {
+        const node: FakeNode =
+            "emitDiscovery" in (nodeOrOptions as object)
+                ? (nodeOrOptions as FakeNode)
+                : createFakeNode(nodeOrOptions as FakeNodeOptions);
+        const setter = (
+            node as { _setLastConfig?: (c: Libp2pDemoNodeConfig) => void }
+        )._setLastConfig;
+        setter?.(config);
+        return node;
+    };
+}

packages/networking/network/react-network-libp2p-demo/tests/setup/polyfills.ts

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+// React-specific polyfills. The base webcrypto polyfill loads via
+// `@suaveplan/testing/polyfills`. This sets the React 18+
+// `IS_REACT_ACT_ENVIRONMENT` flag so DOM assertions outside `act(...)`
+// don't generate runtime warnings.
+interface ReactActEnvWindow {
+    IS_REACT_ACT_ENVIRONMENT?: boolean;
+}
+const win = globalThis as unknown as ReactActEnvWindow;
+if (win.IS_REACT_ACT_ENVIRONMENT === undefined) {
+    win.IS_REACT_ACT_ENVIRONMENT = true;
+}