jenkins-job-builder/tests/yamlparser/job_fixtures/variable_escaping.yaml

- project:
    name: test_template_variable_escaping
    jobs:
        - 'template_variable_escaping':
            defined_var: 'Hello'

- job-template:
    name: 'template_variable_escaping'
    builders:
      - shell: |
          echo "{{var}}"
          echo "{{defined_var|def}}"
          echo "{{undefined_var|def}}"
          echo "{{undefined_var|defined_var}}"