For the refactored code of the Code Coverage API Plugin no integration tests are available. We need integration tests for freestyle jobs and pipelines that cover the following areas:

• Start a job with
  o 0 input files
  o 1 jacoco file
  o 2 jacoco files
• Start the job with
  o 0 input files
  o 1 cobertura file
  o 2 cobertura files
• Start the job with
  o 1 cobertura and 1 jacoco files
• 0 Reports fail vs. ok
• Quality Gates (the existing ones, not our refactoring)
• Health Reporting
• Fail build if coverage decreases
• Skip publishing of checks
• Source Code rendering and copying
• Delta Computation vs. Reference Build
• Report aggregation
• Agent in Docker

For Pipelines there are additional topics available:

• Declarative Pipeline support
• Multiple invocations of step (no tag set)
• Multiple invocations of step (tag set)

You can also have a look at the existing tests of the old model in the class CoveragePublisherPipelineTest . These tests currently handle pipelines only and do not verify the created action (they just verify the logging statements in the job).