J. B. Rainsberger, TDD coach and software consultant, joins Marco to challenge common assumptions about software testing. They discuss why JB argues that “integrated tests are a scam,” how testing choices affect design and refactoring, and what teams get wrong when they rely too heavily on end-to-end tests. The conversation draws on decades of real-world experience working with development teams of all sizes.

💡 Topics in this episode:

• What “integrated tests” really are and why they cause problems

• Micro tests, fast feedback, and confidence-driven testing

• When deleting tests is the right decision

• How tests create pressure on system design

• Collaboration and contract tests explained

• Why there is no single testing best practice

• Practical advice for junior and senior developers

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⏰ Timestamps:

(00:00) Teaser

(01:24) Intro

(02:44) How J. B. got into testing

(06:12) What “integrated tests” actually mean

(10:42) Stop asking “what’s the right test size?”

(13:22) Removing irrelevant details from tests

(15:30) Refactoring, coupling, and deleting tests

(18:08) “There’s no best practice.”

(23:52) Old TDD books and timeless ideas

(26:01) Collaboration and contract tests explained

(33:53) “99.5% of your tests can be micro tests”

(46:21) Do you want to be right or solve the problem?

(01:00:48) Advice for junior developers

(01:19:32) Testing strategy distilled

(01:23:58) Manual QA testing

(01:29:44) Giveaway

(01:33:15) Rapid fire and outro

🎥 Watch the full episode on YouTube: https://youtu.be/j0NjFsb-at8