Function test_engine_succeeds_headless

tests/test_mcp_command.py:124–136

(isolated_config)

# F. Engine end-to-end on a NullUIHost surface — no headless error (unlike pickers)
# --------------------------------------------------------------------------- #
async def test_engine_succeeds_headless(isolated_config):
    tmp = isolated_config
    _set_servers({"a": {"name": "alpha"}})
    reg = CommandRegistry()
    reg.register(MCP_COMMAND)
    ctx = create_command_context(workspace_root=tmp, cwd=tmp)  # ui=None → engine subs NullUIHost
    eng = CommandEngine(registry=reg, workspace_root=tmp, context=ctx)

    result = await eng.execute("/mcp")

    assert result.success is True
    assert result.result_type == "text"
    assert result.text.startswith("MCP servers:")