code: def test_report(self, create_issue_manager):
      issue_manager = create_issue_manager()
      issue_manager.find_issues()
      report = issue_manager.report(
          issues=issue_manager.issues,
          summary=issue_manager.summary,
          info=issue_manager.info,
      )
      assert isinstance(report, str)
      assert (
          "------------------ class_imbalance issues ------------------\n\n"
          "Number of examples with this issue:"
      ) in report
      assert ("Additional Information: \n" "Rarest Class:") in report
  
file_path: cleanlab/tests/datalab/issue_manager/test_imbalance.py
imports: import numpy
  import pytest
  from cleanlab.datalab.internal.issue_manager.imbalance import ClassImbalanceIssueManager
label_desc: Use image node_id 6 for calling the TestClassImbalanceIssueManager obj's underlying member method code with example usage: obj.test_report(create_issue_manager) without return types