diff --git a/tests/run_agent/test_compression_boundary_hook.py b/tests/run_agent/test_compression_boundary_hook.py
index 26bac74163b..ef06e97e369 100644
--- a/tests/run_agent/test_compression_boundary_hook.py
+++ b/tests/run_agent/test_compression_boundary_hook.py
@@ -52,6 +52,11 @@ class TestCompressionBoundaryHook:
             compressor.last_completion_tokens = 0
             # Avoid the summary-error warning path
             compressor._last_summary_error = None
+            # MagicMock auto-creates truthy attrs; explicitly clear the abort
+            # flag so the post-compress abort branch in
+            # conversation_compression.py does not short-circuit before the
+            # session-id rotation we are asserting on.
+            compressor._last_compress_aborted = False
             agent.context_compressor = compressor
 
             original_sid = agent.session_id
@@ -137,6 +142,7 @@ class TestCompressionBoundaryHook:
             compressor.last_prompt_tokens = 0
             compressor.last_completion_tokens = 0
             compressor._last_summary_error = None
+            compressor._last_compress_aborted = False
 
             # Raise only on the compression-boundary call, not on earlier calls.
             def _raise_on_compression(*args, **kwargs):
diff --git a/tests/test_cli_manual_compress.py b/tests/test_cli_manual_compress.py
index 26b966ab6b7..c12bf1a227e 100644
--- a/tests/test_cli_manual_compress.py
+++ b/tests/test_cli_manual_compress.py
@@ -10,13 +10,14 @@ class DummyAgent:
         self.session_id = "new-session"
         self.calls = []
 
-    def _compress_context(self, messages, system_message, *, approx_tokens=None, focus_topic=None):
+    def _compress_context(self, messages, system_message, *, approx_tokens=None, focus_topic=None, force=False):
         self.calls.append(
             {
                 "messages": messages,
                 "system_message": system_message,
                 "approx_tokens": approx_tokens,
                 "focus_topic": focus_topic,
+                "force": force,
             }
         )
         return ([{"role": "user", "content": "[CONTEXT SUMMARY]: compacted"}], "new system prompt")