Perl Testing Patterns

Perl Testing Patterns

Comprehensive testing strategies for Perl applications using Test2::V0, Test::More, prove, and TDD methodology.

When to Activate

• Writing new Perl code (follow TDD: red, green, refactor)
• Designing test suites for Perl modules or applications
• Reviewing Perl test coverage
• Setting up Perl testing infrastructure
• Migrating tests from Test::More to Test2::V0
• Debugging failing Perl tests

TDD Workflow

Always follow the RED-GREEN-REFACTOR cycle.

# Step 1: RED — Write a failing test
# t/unit/calculator.t
use v5.36;
use Test2::V0;

use lib 'lib';
use Calculator;

subtest 'addition' => sub {
    my $calc = Calculator->new;
    is($calc->add(2, 3), 5, 'adds two numbers');
    is($calc->add(-1, 1), 0, 'handles negatives');
};

done_testing;

# Step 2: GREEN — Write minimal implementation
# lib/Calculator.pm
package Calculator;
use v5.36;
use Moo;