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mutation-testing

Scripts to run mutation analysis on collections of student submissions to programming assignments. Mutation testing tools enabled:

  • PIT
  • [EXPERIMENTAL] muJava

Overview

PIT

Usage: ./pit_runner.py --help

pit/pit-runner.py run PIT with different possible sets of operators:

  • default set (according to PIT website)
  • our approximation of Offutt's deletion set
  • our approximation of Offutt's sufficient set
  • all PIT operators evaluated in Laurent et al.'s 2017 paper
  • a custom set of operators, provided as CLI arguments

analysis

Scripts and Jupyter notebooks used for analyses present in the paper

Fast and Accurate Incremental Feedback for Students' Software Tests Using Selective Mutation Analysis. Kazerouni, Davis, Basak, Shaffer, Servant, Edwards. Journal of Systems and Software, 2021.

The paper's pretty long, so an abridged overview of the main results is available.

  • forward_selection.py: A simple implementation of forward selection using statsmodels. This was used in the Core Study in the paper above.
  • utils.py: Various helper functions for wrangling mutation outcome data for analysis and plotting.

Utilities

write_tasks.py

Writes tasks to an NDJSON file. Tasks are just paths to projects where mutation testing is to be run.

Usage: ./write_tasks --help

EXPERIMENTAL muJava

Since muJava runs on Java 8, we use Docker to generate and test these mutants.

Usage: ./mujava_runner.py --help

See also mujava/run-docker.sh