diff --git a/tests/gateway/test_discord_channel_controls.py b/tests/gateway/test_discord_channel_controls.py
index d71304d095..dc7971529a 100644
--- a/tests/gateway/test_discord_channel_controls.py
+++ b/tests/gateway/test_discord_channel_controls.py
@@ -81,6 +81,7 @@ def adapter(monkeypatch):
     config = PlatformConfig(enabled=True, token="fake-token")
     adapter = DiscordAdapter(config)
     adapter._client = SimpleNamespace(user=SimpleNamespace(id=999))
+    adapter._text_batch_delay_seconds = 0  # disable batching for tests
     adapter.handle_message = AsyncMock()
     return adapter
 
diff --git a/tests/gateway/test_discord_free_response.py b/tests/gateway/test_discord_free_response.py
index 09d6968400..bc63c14f5a 100644
--- a/tests/gateway/test_discord_free_response.py
+++ b/tests/gateway/test_discord_free_response.py
@@ -91,6 +91,7 @@ def adapter(monkeypatch):
     config = PlatformConfig(enabled=True, token="fake-token")
     adapter = DiscordAdapter(config)
     adapter._client = SimpleNamespace(user=SimpleNamespace(id=999))
+    adapter._text_batch_delay_seconds = 0  # disable batching for tests
     adapter.handle_message = AsyncMock()
     return adapter
 
diff --git a/tests/gateway/test_discord_slash_commands.py b/tests/gateway/test_discord_slash_commands.py
index 6c4911de84..f7ed646393 100644
--- a/tests/gateway/test_discord_slash_commands.py
+++ b/tests/gateway/test_discord_slash_commands.py
@@ -62,6 +62,7 @@ def adapter():
         fetch_channel=AsyncMock(),
         user=SimpleNamespace(id=99999, name="HermesBot"),
     )
+    adapter._text_batch_delay_seconds = 0  # disable batching for tests
     return adapter
 
 
diff --git a/tests/gateway/test_matrix_mention.py b/tests/gateway/test_matrix_mention.py
index dee7586d22..4c689fa10a 100644
--- a/tests/gateway/test_matrix_mention.py
+++ b/tests/gateway/test_matrix_mention.py
@@ -44,6 +44,7 @@ def _make_adapter(tmp_path=None):
         },
     )
     adapter = MatrixAdapter(config)
+    adapter._text_batch_delay_seconds = 0  # disable batching for tests
     adapter.handle_message = AsyncMock()
     adapter._startup_ts = time.time() - 10  # avoid startup grace filter
     return adapter
diff --git a/tests/gateway/test_wecom.py b/tests/gateway/test_wecom.py
index 418a4b622f..0540146d7c 100644
--- a/tests/gateway/test_wecom.py
+++ b/tests/gateway/test_wecom.py
@@ -508,6 +508,7 @@ class TestInboundMessages:
         from gateway.platforms.wecom import WeComAdapter
 
         adapter = WeComAdapter(PlatformConfig(enabled=True))
+        adapter._text_batch_delay_seconds = 0  # disable batching for tests
         adapter.handle_message = AsyncMock()
         adapter._extract_media = AsyncMock(return_value=(["/tmp/test.png"], ["image/png"]))
 
@@ -539,6 +540,7 @@ class TestInboundMessages:
         from gateway.platforms.wecom import WeComAdapter
 
         adapter = WeComAdapter(PlatformConfig(enabled=True))
+        adapter._text_batch_delay_seconds = 0  # disable batching for tests
         adapter.handle_message = AsyncMock()
         adapter._extract_media = AsyncMock(return_value=([], []))