refactor(channels): dedupe transport and gateway test scaffolds

src/signal/monitor/event-handler.test-harness.ts

@@ -0,0 +1,35 @@
+import type { SignalEventHandlerDeps, SignalReactionMessage } from "./event-handler.types.js";
+
+export function createBaseSignalEventHandlerDeps(
+  overrides: Partial<SignalEventHandlerDeps> = {},
+): SignalEventHandlerDeps {
+  return {
+    // oxlint-disable-next-line typescript/no-explicit-any
+    runtime: { log: () => {}, error: () => {} } as any,
+    cfg: {},
+    baseUrl: "http://localhost",
+    accountId: "default",
+    historyLimit: 5,
+    groupHistories: new Map(),
+    textLimit: 4000,
+    dmPolicy: "open",
+    allowFrom: ["*"],
+    groupAllowFrom: ["*"],
+    groupPolicy: "open",
+    reactionMode: "off",
+    reactionAllowlist: [],
+    mediaMaxBytes: 1024,
+    ignoreAttachments: true,
+    sendReadReceipts: false,
+    readReceiptsViaDaemon: false,
+    fetchAttachment: async () => null,
+    deliverReplies: async () => {},
+    resolveSignalReactionTargets: () => [],
+    isSignalReactionMessage: (
+      _reaction: SignalReactionMessage | null | undefined,
+    ): _reaction is SignalReactionMessage => false,
+    shouldEmitSignalReactionNotification: () => false,
+    buildSignalReactionSystemEventText: () => "reaction",
+    ...overrides,
+  };
+}