test: add pipe command splitting test

Author: Yoshihiro Takahara

tests/test_shell_executor_pipeline.py

@@ -0,0 +1,36 @@
+import pytest
+
+from mcp_shell_server.shell_executor import ShellExecutor
+
+
+@pytest.mark.asyncio
+async def test_pipeline_split():
+    """Test pipeline command splitting functionality"""
+    executor = ShellExecutor()
+
+    # Test basic pipe command
+    commands = executor._split_pipe_commands(["echo", "hello", "|", "grep", "h"])
+    assert len(commands) == 2
+    assert commands[0] == ["echo", "hello"]
+    assert commands[1] == ["grep", "h"]
+
+    # Test empty pipe sections
+    commands = executor._split_pipe_commands(["|", "grep", "pattern"])
+    assert len(commands) == 2
+    assert commands[0] == []
+    assert commands[1] == ["grep", "pattern"]
+
+    # Test multiple pipes
+    commands = executor._split_pipe_commands(
+        ["cat", "file.txt", "|", "grep", "pattern", "|", "wc", "-l"]
+    )
+    assert len(commands) == 3
+    assert commands[0] == ["cat", "file.txt"]
+    assert commands[1] == ["grep", "pattern"]
+    assert commands[2] == ["wc", "-l"]
+
+    # Test trailing pipe
+    commands = executor._split_pipe_commands(["echo", "hello", "|"])
+    assert len(commands) == 2
+    assert commands[0] == ["echo", "hello"]
+    assert commands[1] == []