Begin with a Hoppr Tar Bundle. This is typically a bundle.tar.gz file. Be sure to document in the "git commit" where you got the file. A good place to find files is in hoppr/test/integration.
For APT, the file was obtained from hoppr/test/integration/IntTest_14
One exception to this is Npm, which had to clone hoppr/test/integration/IntTest_12.
Create the directory structure under droppr/test/MODULE, with subdirectories filesys, local_install, and nexus (as appropriate). The subdirectories have the files .droppr.yml and expected-result-summary* files.
The .droppr.yml file can be derived from other files in droppr/test
The expected-result-summary file takes some trial-and-error.
One idea is to create a dummy file, commit to the branch, and the pipeline will show the expected vs. actual.
Then carefully import the actual into the expected-result-summary file