Check for presence of dependencies

https://metacpan.org/release/Test-CheckDeps

Easily create test classes in an xUnit style

https://metacpan.org/release/Test-Class

Provides basic first-pass API testing for large class trees

https://metacpan.org/release/Test-ClassAPI

Check for uncleaned imports

https://metacpan.org/release/Test-CleanNamespaces

Test data structures for differences deeply

https://metacpan.org/release/Test-Deep

Test all modules which depend on your module

https://metacpan.org/release/Test-DependentModules

Test::Differences - Test strings and data structures for differences

https://metacpan.org/release/Test-Differences

Check the correct line endings in your project

https://metacpan.org/release/Test-EOL

Test functions for exception based code

https://metacpan.org/release/Test-Exception

Add test failures if warnings are caught

https://metacpan.org/release/Test-FailWarnings

Incredibly simple helpers for testing code with exceptions

https://metacpan.org/release/Test-Fatal

Test file attributes

https://metacpan.org/release/Test-File

Create a fake ShareDir for your modules for testing

https://metacpan.org/release/Test-File-ShareDir

Run perl standard test scripts with statistics

http://search.cpan.org/dist/Test-Harness/

Test binary as hexadecimal string

https://metacpan.org/release/Test-HexDifferences

Assert the referential identity of a reference

https://metacpan.org/release/Test-Identity

Framework for more readable interactive test scripts

https://metacpan.org/release/Test-Inter

Test the Kwalitee of a distribution before you release it

https://metacpan.org/release/Test-Kwalitee

Traces memory leaks

https://metacpan.org/release/Test-LeakTrace

Library to test long strings

https://metacpan.org/release/Test-LongString

Perl module to interact with a t/test_manifest file

https://metacpan.org/release/Test-Manifest

Check for memory leaks and circular memory references

https://metacpan.org/release/Test-Memory-Cycle

Override subroutines in a module for unit testing

https://metacpan.org/release/Test-MockModule

Tests remote URLs or local web files

https://metacpan.org/release/Test-MockObject

Replaces random number generation with non-random number generation

https://metacpan.org/release/Test-MockRandom

Replaces actual time with simulated time

https://metacpan.org/release/Test-MockTime

Enhancing Test::More for UTF-8-based projects

https://metacpan.org/release/Test-More-UTF8

Perl extension for most commonly needed test functions and features

https://metacpan.org/release/Test-Most

Skip tests when modules not available

https://metacpan.org/release/Test-Needs

Check the presence of tabs in your project

https://metacpan.org/release/Test-NoTabs

Hide and store warnings while running test scripts

http://search.cpan.org/dist/Test-NoWarnings/

Compare the difference between two numbers within a specified amount

https://metacpan.org/release/Test-Number-Delta

Thoroughly testing objects via registered handlers

https://metacpan.org/release/Test-Object

Utilities to test STDOUT and STDERR messages

https://metacpan.org/release/Test-Output

Use Perl::Critic in test programs

https://metacpan.org/release/Test-Perl-Critic

Check for POD errors in files

https://metacpan.org/release/Test-Pod

Check for pod coverage in your distribution

https://metacpan.org/release/Test-Pod-Coverage

Assert reference counts on objects

https://metacpan.org/release/Test-Refcount

Perl extension for checking to see if the module can be loaded

https://metacpan.org/release/Test-Requires

Test network connectivity before functional tests

https://metacpan.org/release/Test-RequiresInternet

Composable, reusable tests with roles and Moo

https://metacpan.org/release/Test-Roo

Test::Script - Cross-platform basic tests for scripts

https://metacpan.org/release/Test-Script

Basic utilities for writing tests in perl

https://metacpan.org/release/Test-Simple

Check for spelling errors in POD files

https://metacpan.org/release/Test-Spelling

Test and report on use strict/warnings coverage

https://metacpan.org/release/Test-Strict

Track the number of times subs are called

https://metacpan.org/release/Test-SubCalls

Tools to test taintedness

https://metacpan.org/release/Test-Taint

Helps to test various Test::Builder derivatives

http://search.cpan.org/dist/Test-Tester/

Perl extension to override time()/sleep() core functions for testing

https://metacpan.org/release/Test-Time

Perl test module to test/assert response times

https://metacpan.org/release/Test-Timer