code: def test_show_simple(tmp_dir, dvc, run_copy_metrics):
      tmp_dir.gen("metrics_t.yaml", "1.1")
      run_copy_metrics(
          "metrics_t.yaml",
          "metrics.yaml",
          name="copy-metrics",
          metrics=["metrics.yaml"],
      )
      assert dvc.metrics.show() == {
          "": {"data": {"metrics.yaml": {"data": 1.1}}}
      }
  
imports: import json
  import os
  from os.path import join
  import pytest
  from funcy import get_in
  from dvc.cli import main
  from dvc.dvcfile import PROJECT_FILE
  from dvc.exceptions import OverlappingOutputPathsError
  from dvc.repo import Repo
  from dvc.utils.fs import remove
  from dvc.utils.serialize import JSONFileCorruptedError
label_desc: Use image node_id 1 for calling a global function with example usage: test_show_simple(tmp_dir, dvc, run_copy_metrics) without return types