perl-testing

Use Test2::V0 with is() for equality, subtests for grouping, and hash/array builders for deep comparison. End every test file with done_testing and run tests with prove -lv to include the lib directory.

Test2::V0 offers richer assertions, better failure diagnostics, and extensible plugins compared to Test::More. It is backward-compatible with Test::More tests, so prefer Test2::V0 for new projects.

Run prove with the -j flag followed by the job count, such as prove -lr -j8 t/, to execute tests across eight parallel workers. Add --state=failed to rerun only previously failing tests.

Use Test::MockModule to override methods on a target package, for example $mock->mock(fetch_user => sub { ... }). The mock restores automatically when the object goes out of scope, preventing leakage between tests.

This happens when prove runs without the -l flag, so modules in the lib/ directory are not added to @INC. Always run prove -l t/ or configure -l in your .proverc file.

Run cover -test to execute the suite under coverage, then cover -report html to generate a browsable report. For CI, parse the text report and fail the build when total coverage drops below your threshold.