diff --git a/tests/test_issue3983_browser_tts_watchdog.py b/tests/test_issue3983_browser_tts_watchdog.py
index d515c804..e6ac1235 100644
--- a/tests/test_issue3983_browser_tts_watchdog.py
+++ b/tests/test_issue3983_browser_tts_watchdog.py
@@ -5,6 +5,24 @@ import re
 REPO = Path(__file__).resolve().parents[1]
 
 
+def _extract_function(src: str, name: str) -> str:
+    anchor = f"function {name}("
+    start = src.find(anchor)
+    assert start != -1, f"{name}() must exist"
+    body_start = src.find("{", start)
+    assert body_start != -1, f"{name}() must have a body"
+    depth = 1
+    idx = body_start + 1
+    while depth and idx < len(src):
+        if src[idx] == "{":
+            depth += 1
+        elif src[idx] == "}":
+            depth -= 1
+        idx += 1
+    assert depth == 0, f"{name}() body must balance braces"
+    return src[start:idx]
+
+
 def test_boot_js_declares_browser_tts_recovery_helpers():
     src = (REPO / "static" / "boot.js").read_text(encoding="utf-8")
     assert "let _browserTtsKeepAlive=null;" in src
@@ -16,9 +34,7 @@ def test_boot_js_declares_browser_tts_recovery_helpers():
 
 def test_browser_tts_watchdog_rearms_listening_if_onend_drops():
     src = (REPO / "static" / "boot.js").read_text(encoding="utf-8")
-    arm_idx = src.find("function _armBrowserTtsRecovery(clean, rate){")
-    assert arm_idx != -1
-    arm_body = src[arm_idx : arm_idx + 1400]
+    arm_body = _extract_function(src, "_armBrowserTtsRecovery")
     assert "_browserTtsWatchdog=setTimeout" in arm_body
     assert "_voiceModeState!=='speaking'" in arm_body
     assert "_browserTtsSuppressNextErrorRearm=true;" in arm_body
@@ -31,9 +47,8 @@ def test_browser_tts_watchdog_rearms_listening_if_onend_drops():
 
 def test_browser_tts_callbacks_and_deactivate_clear_recovery_handles():
     src = (REPO / "static" / "boot.js").read_text(encoding="utf-8")
-    speak_idx = src.find("const utter=new SpeechSynthesisUtterance(clean);")
-    assert speak_idx != -1
-    speak_body = src[speak_idx : speak_idx + 1200]
+    speak_body = _extract_function(src, "_speakResponse")
+    assert "const utter=new SpeechSynthesisUtterance(clean);" in speak_body
     assert "utter.onend=()=>{" in speak_body
     assert "utter.onerror=()=>{" in speak_body
     assert speak_body.count("_clearBrowserTtsRecovery();") >= 2, (
@@ -44,13 +59,7 @@ def test_browser_tts_callbacks_and_deactivate_clear_recovery_handles():
     assert "if(_browserTtsSuppressNextErrorRearm){" in speak_body
     assert "_armBrowserTtsRecovery(clean, utter.rate);" in speak_body
 
-    deactivate_match = re.search(
-        r"function _deactivate\(\)\{(.*?)\n  \}",
-        src,
-        re.DOTALL,
-    )
-    assert deactivate_match, "_deactivate() must exist"
-    deactivate_body = deactivate_match.group(1)
+    deactivate_body = _extract_function(src, "_deactivate")
     assert "_clearBrowserTtsRecovery();" in deactivate_body, (
         "_deactivate() must clear browser TTS watchdog/keep-alive handles."
     )