code: def test_csource_module():
      mod = tvm.runtime._ffi_api.CSourceModuleCreate("", "cc", [], [])
      assert mod.type_key == "c"
      assert mod.is_binary_serializable
      new_mod = tvm.ir.load_json(tvm.ir.save_json(mod))
      assert new_mod.type_key == "c"
      assert new_mod.is_binary_serializable
  
file_path: tvm/tests/python/ir/test_roundtrip_runtime_module.py
imports: import pytest
  import tvm
  import tvm.testing
  from tvm import TVMError
  from tvm import relay
label_desc: Use image node_id 1 for calling a global function with example usage: test_csource_module() without return types