diff --git a/src/browser/server-context.ensure-tab-available.prefers-last-target.test.ts b/src/browser/server-context.ensure-tab-available.prefers-last-target.test.ts
index 2677d840ebd..455d543fff6 100644
--- a/src/browser/server-context.ensure-tab-available.prefers-last-target.test.ts
+++ b/src/browser/server-context.ensure-tab-available.prefers-last-target.test.ts
@@ -25,9 +25,61 @@ vi.mock("./chrome.js", () => ({
   stopOpenClawChrome: vi.fn(async () => {}),
 }));
 
+function makeBrowserState(): BrowserServerState {
+  return {
+    // oxlint-disable-next-line typescript/no-explicit-any
+    server: null as any,
+    port: 0,
+    resolved: {
+      enabled: true,
+      controlPort: 18791,
+      cdpProtocol: "http",
+      cdpHost: "127.0.0.1",
+      cdpIsLoopback: true,
+      color: "#FF4500",
+      headless: true,
+      noSandbox: false,
+      attachOnly: false,
+      defaultProfile: "chrome",
+      profiles: {
+        chrome: {
+          driver: "extension",
+          cdpUrl: "http://127.0.0.1:18792",
+          cdpPort: 18792,
+          color: "#00AA00",
+        },
+        openclaw: { cdpPort: 18800, color: "#FF4500" },
+      },
+    },
+    profiles: new Map(),
+  };
+}
+
+function stubChromeJsonList(responses: unknown[]) {
+  const fetchMock = vi.fn();
+  const queue = [...responses];
+
+  fetchMock.mockImplementation(async (url: unknown) => {
+    const u = String(url);
+    if (!u.includes("/json/list")) {
+      throw new Error(`unexpected fetch: ${u}`);
+    }
+    const next = queue.shift();
+    if (!next) {
+      throw new Error("no more responses");
+    }
+    return {
+      ok: true,
+      json: async () => next,
+    } as unknown as Response;
+  });
+
+  global.fetch = fetchMock;
+  return fetchMock;
+}
+
 describe("browser server-context ensureTabAvailable", () => {
   it("sticks to the last selected target when targetId is omitted", async () => {
-    const fetchMock = vi.fn();
     // 1st call (snapshot): stable ordering A then B (twice)
     // 2nd call (act): reversed ordering B then A (twice)
     const responses = [
@@ -48,52 +100,8 @@ describe("browser server-context ensureTabAvailable", () => {
         { id: "A", type: "page", url: "https://a.example", webSocketDebuggerUrl: "ws://x/a" },
       ],
     ];
-
-    fetchMock.mockImplementation(async (url: unknown) => {
-      const u = String(url);
-      if (!u.includes("/json/list")) {
-        throw new Error(`unexpected fetch: ${u}`);
-      }
-      const next = responses.shift();
-      if (!next) {
-        throw new Error("no more responses");
-      }
-      return {
-        ok: true,
-        json: async () => next,
-      } as unknown as Response;
-    });
-
-    global.fetch = fetchMock;
-
-    const state: BrowserServerState = {
-      // unused in these tests
-      // oxlint-disable-next-line typescript/no-explicit-any
-      server: null as any,
-      port: 0,
-      resolved: {
-        enabled: true,
-        controlPort: 18791,
-        cdpProtocol: "http",
-        cdpHost: "127.0.0.1",
-        cdpIsLoopback: true,
-        color: "#FF4500",
-        headless: true,
-        noSandbox: false,
-        attachOnly: false,
-        defaultProfile: "chrome",
-        profiles: {
-          chrome: {
-            driver: "extension",
-            cdpUrl: "http://127.0.0.1:18792",
-            cdpPort: 18792,
-            color: "#00AA00",
-          },
-          openclaw: { cdpPort: 18800, color: "#FF4500" },
-        },
-      },
-      profiles: new Map(),
-    };
+    stubChromeJsonList(responses);
+    const state = makeBrowserState();
 
     const ctx = createBrowserRouteContext({
       getState: () => state,
@@ -107,53 +115,12 @@ describe("browser server-context ensureTabAvailable", () => {
   });
 
   it("falls back to the only attached tab when an invalid targetId is provided (extension)", async () => {
-    const fetchMock = vi.fn();
     const responses = [
       [{ id: "A", type: "page", url: "https://a.example", webSocketDebuggerUrl: "ws://x/a" }],
       [{ id: "A", type: "page", url: "https://a.example", webSocketDebuggerUrl: "ws://x/a" }],
     ];
-
-    fetchMock.mockImplementation(async (url: unknown) => {
-      const u = String(url);
-      if (!u.includes("/json/list")) {
-        throw new Error(`unexpected fetch: ${u}`);
-      }
-      const next = responses.shift();
-      if (!next) {
-        throw new Error("no more responses");
-      }
-      return { ok: true, json: async () => next } as unknown as Response;
-    });
-
-    global.fetch = fetchMock;
-
-    const state: BrowserServerState = {
-      // oxlint-disable-next-line typescript/no-explicit-any
-      server: null as any,
-      port: 0,
-      resolved: {
-        enabled: true,
-        controlPort: 18791,
-        cdpProtocol: "http",
-        cdpHost: "127.0.0.1",
-        cdpIsLoopback: true,
-        color: "#FF4500",
-        headless: true,
-        noSandbox: false,
-        attachOnly: false,
-        defaultProfile: "chrome",
-        profiles: {
-          chrome: {
-            driver: "extension",
-            cdpUrl: "http://127.0.0.1:18792",
-            cdpPort: 18792,
-            color: "#00AA00",
-          },
-          openclaw: { cdpPort: 18800, color: "#FF4500" },
-        },
-      },
-      profiles: new Map(),
-    };
+    stubChromeJsonList(responses);
+    const state = makeBrowserState();
 
     const ctx = createBrowserRouteContext({ getState: () => state });
     const chrome = ctx.forProfile("chrome");
@@ -162,49 +129,9 @@ describe("browser server-context ensureTabAvailable", () => {
   });
 
   it("returns a descriptive message when no extension tabs are attached", async () => {
-    const fetchMock = vi.fn();
     const responses = [[]];
-    fetchMock.mockImplementation(async (url: unknown) => {
-      const u = String(url);
-      if (!u.includes("/json/list")) {
-        throw new Error(`unexpected fetch: ${u}`);
-      }
-      const next = responses.shift();
-      if (!next) {
-        throw new Error("no more responses");
-      }
-      return { ok: true, json: async () => next } as unknown as Response;
-    });
-
-    global.fetch = fetchMock;
-
-    const state: BrowserServerState = {
-      // oxlint-disable-next-line typescript/no-explicit-any
-      server: null as any,
-      port: 0,
-      resolved: {
-        enabled: true,
-        controlPort: 18791,
-        cdpProtocol: "http",
-        cdpHost: "127.0.0.1",
-        cdpIsLoopback: true,
-        color: "#FF4500",
-        headless: true,
-        noSandbox: false,
-        attachOnly: false,
-        defaultProfile: "chrome",
-        profiles: {
-          chrome: {
-            driver: "extension",
-            cdpUrl: "http://127.0.0.1:18792",
-            cdpPort: 18792,
-            color: "#00AA00",
-          },
-          openclaw: { cdpPort: 18800, color: "#FF4500" },
-        },
-      },
-      profiles: new Map(),
-    };
+    stubChromeJsonList(responses);
+    const state = makeBrowserState();
 
     const ctx = createBrowserRouteContext({ getState: () => state });
     const chrome = ctx.forProfile("chrome");