Question 1

How do I use TestProf to profile factory usage in my Rails tests?

Accepted Answer

TestProf provides specific analyzers like FactoryProf for RSpec and minitest. Enable it in your test configuration to track factory calls and database hits, then review reports to identify and reduce unnecessary factory creations.

Question 2

TestProf or just using ruby-prof alone: which is better for Ruby tests?

Accepted Answer

TestProf integrates ruby-prof with test-specific helpers and tools, making it more tailored for test suites. While ruby-prof alone offers general profiling, TestProf adds focused analyzers for factories and test frameworks, saving configuration effort.

Question 3

Can TestProf work with minitest in a non-Rails Ruby project?

Accepted Answer

Yes, TestProf supports minitest helpers and profilers independently of Rails. However, some features like ActiveSupport-backed tools may be less relevant, so you can use the modular components that fit your project's needs.

Question 4

How to avoid TestProf overhead in production-like test environments?

Accepted Answer

Configure TestProf to run only in specific environments or use conditionals to enable profilers selectively. For example, use tags in RSpec to profile only slow tests, minimizing impact on overall suite execution.

Question 5

What's the difference between TestProf's factory profiler and tools like database_cleaner?

Accepted Answer

TestProf's factory profiler analyzes performance bottlenecks from factory usage, while database_cleaner focuses on cleaning database state between tests. They serve different purposes but can be used together to optimize test speed and reliability.

Question 6

Does TestProf support parallel test execution?

Accepted Answer

TestProf itself doesn't handle parallelization, but it can be used alongside parallel testing gems. Some profilers may need adaptation for parallel runs, so check the documentation for compatibility with tools like parallel_tests.

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