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This article explains why unit testing is often seen as burdensome, then provides practical Go techniques—using pure functions, extracting dependencies, object‑oriented design, function variableization, and avoiding init—to write business code that is easy to test and maintain.
The guide shows that by consciously designing Go data structures and function interfaces—using pure functions, parameter injection, interface abstractions, struct‑based objects, or function‑variable patterns—and avoiding init(), developers can expose and control all dependencies, making business code inherently testable and achieving high unit‑test coverage.
Writing unit-testable code often requires refactoring, and by focusing on minimizing function size, dependencies, and complexity, developers can adopt seven practical techniques—including limiting function lines, single responsibility, dependency injection, avoiding complex parameters, using abstractions, extracting testable units, and handling private functions—to improve testability and team efficiency.