diff --git a/src/infra/machine-name.test.ts b/src/infra/machine-name.test.ts
new file mode 100644
index 00000000000..f36efd6ceee
--- /dev/null
+++ b/src/infra/machine-name.test.ts
@@ -0,0 +1,54 @@
+import os from "node:os";
+import { afterEach, describe, expect, it, vi } from "vitest";
+import { importFreshModule } from "../../test/helpers/import-fresh.js";
+
+const execFileMock = vi.hoisted(() => vi.fn());
+
+vi.mock("node:child_process", () => ({
+  execFile: (...args: unknown[]) => execFileMock(...args),
+}));
+
+const originalVitest = process.env.VITEST;
+const originalNodeEnv = process.env.NODE_ENV;
+
+async function importMachineName(scope: string) {
+  return await importFreshModule<typeof import("./machine-name.js")>(
+    import.meta.url,
+    `./machine-name.js?scope=${scope}`,
+  );
+}
+
+afterEach(() => {
+  execFileMock.mockReset();
+  vi.restoreAllMocks();
+  if (originalVitest === undefined) {
+    delete process.env.VITEST;
+  } else {
+    process.env.VITEST = originalVitest;
+  }
+  if (originalNodeEnv === undefined) {
+    delete process.env.NODE_ENV;
+  } else {
+    process.env.NODE_ENV = originalNodeEnv;
+  }
+});
+
+describe("getMachineDisplayName", () => {
+  it("uses the hostname fallback in test mode and trims .local", async () => {
+    const hostnameSpy = vi.spyOn(os, "hostname").mockReturnValue("  clawbox.local  ");
+    const machineName = await importMachineName("test-fallback");
+
+    await expect(machineName.getMachineDisplayName()).resolves.toBe("clawbox.local");
+    await expect(machineName.getMachineDisplayName()).resolves.toBe("clawbox.local");
+    expect(hostnameSpy).toHaveBeenCalledTimes(1);
+    expect(execFileMock).not.toHaveBeenCalled();
+  });
+
+  it("falls back to the default product name when hostname is blank", async () => {
+    vi.spyOn(os, "hostname").mockReturnValue("   ");
+    const machineName = await importMachineName("blank-hostname");
+
+    await expect(machineName.getMachineDisplayName()).resolves.toBe("openclaw");
+    expect(execFileMock).not.toHaveBeenCalled();
+  });
+});
diff --git a/src/infra/outbound/channel-adapters.test.ts b/src/infra/outbound/channel-adapters.test.ts
new file mode 100644
index 00000000000..ee2b5fe6dc8
--- /dev/null
+++ b/src/infra/outbound/channel-adapters.test.ts
@@ -0,0 +1,48 @@
+import { Separator, TextDisplay } from "@buape/carbon";
+import { describe, expect, it } from "vitest";
+import { DiscordUiContainer } from "../../discord/ui.js";
+import { getChannelMessageAdapter } from "./channel-adapters.js";
+
+describe("getChannelMessageAdapter", () => {
+  it("returns the default adapter for non-discord channels", () => {
+    expect(getChannelMessageAdapter("telegram")).toEqual({
+      supportsComponentsV2: false,
+    });
+  });
+
+  it("returns the discord adapter with a cross-context component builder", () => {
+    const adapter = getChannelMessageAdapter("discord");
+
+    expect(adapter.supportsComponentsV2).toBe(true);
+    expect(adapter.buildCrossContextComponents).toBeTypeOf("function");
+
+    const components = adapter.buildCrossContextComponents?.({
+      originLabel: "Telegram",
+      message: "Hello from chat",
+      cfg: {} as never,
+      accountId: "primary",
+    });
+    const container = components?.[0] as DiscordUiContainer | undefined;
+
+    expect(components).toHaveLength(1);
+    expect(container).toBeInstanceOf(DiscordUiContainer);
+    expect(container?.components).toEqual([
+      expect.any(TextDisplay),
+      expect.any(Separator),
+      expect.any(TextDisplay),
+    ]);
+  });
+
+  it("omits the message body block when the cross-context message is blank", () => {
+    const adapter = getChannelMessageAdapter("discord");
+    const components = adapter.buildCrossContextComponents?.({
+      originLabel: "Signal",
+      message: "   ",
+      cfg: {} as never,
+    });
+    const container = components?.[0] as DiscordUiContainer | undefined;
+
+    expect(components).toHaveLength(1);
+    expect(container?.components).toEqual([expect.any(TextDisplay)]);
+  });
+});