code: def test_validate_template():
      template = "{prompt}"
      template_missing_left = "prompt}"
      template_missing_right = "{prompt"
      template_twice = "{{prompt}}"
      template_enclosed = "{prompt{enclosed}}"
      assert validate_template(template) is None
      with pytest.raises(ValueError):
          validate_template(template_missing_left)
      with pytest.raises(ValueError):
          validate_template(template_missing_right)
      with pytest.raises(ValueError):
          validate_template(template_twice)
      with pytest.raises(ValueError):
          validate_template(template_enclosed)
  
imports: import pandas
  import pytest
  from ..customization_dataset_preparation import convert_into_prompt_completion_only, convert_into_template, drop_duplicated_rows, drop_unrequired_fields, get_common_suffix, get_prepared_filename, parse_template, recommend_hyperparameters, show_first_example_in_df, split_into_train_validation, template_mapper, validate_template, warn_and_drop_long_samples, warn_completion_is_not_empty, warn_duplicated_rows, warn_imbalanced_completion, warn_low_n_samples, warn_missing_suffix
label_desc: Use image node_id 7 for calling a global function with example usage: test_validate_template() without return types