add failing test for stopping bash session

tests/unit/test_bash_session_stop.py

@@ -0,0 +1,67 @@
+import pytest
+import time
+from openhands.events.action import CmdRunAction
+from openhands.events.observation import CmdOutputObservation
+from openhands.runtime.utils.bash import BashSession
+
+def test_bash_session_stop_behavior():
+    """Test that stopping a long-running process works correctly."""
+    session = BashSession(work_dir="/tmp", no_change_timeout_seconds=1)
+    session.initialize()
+
+    # Start a long-running process that will timeout
+    action = CmdRunAction(command="sleep 10")
+    action.set_hard_timeout(2)  # Set a timeout so test doesn't hang
+    action.blocking = False  # Allow no-change timeout
+
+    # Execute the command and wait for timeout
+    result = session.execute(action)
+    assert isinstance(result, CmdOutputObservation)
+    assert "command timed out" in result.metadata.suffix.lower() or "no new output" in result.metadata.suffix.lower()
+
+    # Try to send a new command - this should fail since process is still running
+    new_action = CmdRunAction(command="echo test")
+    new_result = session.execute(new_action)
+    assert isinstance(new_result, CmdOutputObservation)
+    assert "previous command is still running" in new_result.metadata.suffix.lower()
+    assert "not executed" in new_result.metadata.suffix.lower()
+
+    # Try to send an empty command - this should show the running process output
+    empty_action = CmdRunAction(command="")
+    empty_result = session.execute(empty_action)
+    assert isinstance(empty_result, CmdOutputObservation)
+    assert "output of the previous command" in empty_result.metadata.prefix.lower()
+
+    # Clean up
+    session.close()
+
+def test_bash_session_stop_command():
+    """Test that sending C-c to stop a process works correctly."""
+    session = BashSession(work_dir="/tmp", no_change_timeout_seconds=1)
+    session.initialize()
+
+    # Start a long-running process that will timeout
+    action = CmdRunAction(command="sleep 10")
+    action.set_hard_timeout(2)  # Set a timeout so test doesn't hang
+    action.blocking = False  # Allow no-change timeout
+
+    # Execute the command and wait for timeout
+    result = session.execute(action)
+    assert isinstance(result, CmdOutputObservation)
+    assert "command timed out" in result.metadata.suffix.lower() or "no new output" in result.metadata.suffix.lower()
+
+    # Send C-c to stop the process
+    stop_action = CmdRunAction(command="C-c", is_input="true")
+    stop_result = session.execute(stop_action)
+    assert isinstance(stop_result, CmdOutputObservation)
+    assert stop_result.metadata.exit_code == 130  # 130 is the exit code for SIGINT
+
+    # Now we should be able to run a new command
+    new_action = CmdRunAction(command="echo test")
+    new_result = session.execute(new_action)
+    assert isinstance(new_result, CmdOutputObservation)
+    assert new_result.metadata.exit_code == 0
+    assert "test" in new_result.content
+
+    # Clean up
+    session.close()