How to Build a Reliable Test Suite From Scratch Without Wasting Effort

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Starting a test suite from zero requires prioritizing trust over volume, according to a software developer reflecting on lessons learned from a poorly structured 400-test codebase. The recommended approach begins with identifying five to ten critical user flows whose silent failure would cause real harm, rather than chasing full code coverage. Unit tests should focus on logic-heavy components like pricing or validation rules, while integration points with databases and third-party APIs deserve special attention since that is where most production bugs originate. Tools that record and replay real API traffic can reduce the manual effort of writing mocks for every external scenario. Flaky tests should be fixed immediately in a new suite, as ignoring them early erodes team confidence and compounds over time.

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