https://nalar.dev/tags/unit-testing/ Recent content in Unit Testing on Nalar Hugo en-us Thu, 10 Sep 2026 00:00:00 +0700 https://nalar.dev/choosing-sociable-or-solitary-unit-tests/ Thu, 10 Sep 2026 00:00:00 +0700 https://nalar.dev/choosing-sociable-or-solitary-unit-tests/ <h1 id="choosing-sociable-or-solitary-unit-tests">Choosing Sociable or Solitary Unit Tests</h1> <p>A unit test fails after a harmless refactor. The production behaviour is still correct, but the test expected an internal collaborator to receive exactly three calls. Elsewhere, a different unit test passes even though two real classes no longer work together, because both sides were replaced with mocks.</p> <p>Both tests are isolated in some sense, yet they give poor feedback for different reasons. The useful question isn&rsquo;t simply whether unit tests should use mocks. It is <strong>where the test boundary should be</strong>.</p>