phylline

Phylline is a sans-io bidirectional data pipeline framework for making layered communication protocols in Python.

The key idea is a uniform pipe-and-filter style for applying data transformations in two directions (send downwards and receive upwards) to create a bidirectional data pipeline. Data pipelines may be linear or branching.

Unit Tests

Unit tests can be run with the pytest command from the repository directory. This will require installation of the packages listed in tests/requirements.txt. Then you can take advantage of the following features:

• Show test errors immediately, rather than at the end of testing.
• Generate an HTML report at testreport.html
• Run tests in parallel with the -n NUM argument.
• Run tests related to modified files (as determined by Git) before all other tests with the --picked=first argument, and run only tests related to modified files with the --picked. By default, "modified files" is releative to unstaged files, but pytest will reinterpret it as relative to the base of the current branch with --mode=branch.
• Summarize gaps in test coverage with the --cov=phylline --cov-branch --cov-report term-missing:skip-covered arguments; add the --cov-report html argument to also generate an html report at htmlcov/index.html. Note that if you use these when tests are run in parallel, you may get a warning that no coverage was collected.
• Show a summary of Hypothesis fuzz tests with the --hypothesis-show-statistics argument.
• Perform performance profiling with --profile --profile-svg. The report is generated to prof/combined.svg.

as well as the following built-in features which come with pytest:

• List each individual test with --verbose. Note that output is cleaner when tests are not run in parallel.
• Only run previously failed tests with --last-failed.
• Run previously failed tests before other tests with --failed-first.
• Switch to pdb on the first failure with --pdb -x
• Report how long each test took to run with --durations=0

For example, to run all tests quickly, prioritizing changed files and previously failed tests, use either of the two following equivalent commands:

pytest --picked=first --failed-first -n auto
python3 setup.py test_quick

For example, to run only tests for files with modifications since the base of the current Git branch, prioritizing changed files, use either of the two following equivalent commands:

pytest --picked --mode=branch --failed-first -n auto
python3 setup.py test_quick_branch

For example, to switch to pdb on the first failure, use either of the two following equivalent commands:

pytest --picked=first --failed-first --pdb -x
python3 setup.py test_debug

For example, to do performance profiling, use either of the two following equivalent commands:

pytest --profile --profile-svg
python3 setup.py test_perf

For example, to get a coverage summary, use either of the two following equivalent commands:

pytest --cov=phylline --cov-branch --cov-report term-missing:skip-covered --cov-report html
python3 setup.py test_coverage

The most complete report can be obtained with either of the two following equivalent commands:

pytest --durations=0 --cov=phylline --cov-branch --cov-report term-missing --cov-report html --hypothesis-show-statistics --verbose
python3 setup.py test_complete