How to mock object creation?

[Warchant]

Describe your use-case which is not covered by existing documentation.

Documentation lacks an example which shows how to mock object creation in the pipeline.

Specifically, my jenkins controller has this plugin installed: https://plugins.jenkins.io/influxdb/
And in my shared library I have a file:
/vars/dashboard.groovy with a function that is similar to this: https://github.com/jenkinsci/influxdb-plugin#via-jenkins-pipeline

def influxDb(Map args) {
    lock(targetName) {
        // Copy from: https://github.com/jenkinsci/influxdb-plugin#via-jenkins-pipeline
        def influxdb = Jenkins.instance.getDescriptorByType(jenkinsci.plugins.influxdb.InfluxDbStep.DescriptorImpl)
        def targests = influxdb.getTargets()
        influxdb.removeTarget(targetName)
        def target = new jenkinsci.plugins.influxdb.models.Target()
        target.description = targetName
        target.url = args.dashboard.influx_server_url

See this line: def target = new jenkinsci.plugins.influxdb.models.Target().

Because local gradle project does not define any dependency on this influxdb-plugin, this class is undefined. When I attempt to load my shared library, I get an error

file:/C:/W/jenkins_shared_library/test/resources/ReportTest_WhenUnstable.Jenkinsfile: 1: Error on loading library LuCI@master : startup failed:
C:\W\jenkins_shared_library\vars\dashboard.groovy: 101: unable to resolve class jenkinsci.plugins.influxdb.models.Target
 @ line 101, column 22.
           def target = new jenkinsci.plugins.influxdb.models.Target()

I'd like to instantiate a mock here.

Reference any relevant documentation, other materials or issues/pull requests that can be used for inspiration.

No response