How Can I Effectively Test Generic Functions in Go?

Testing Generic Functions in Go

The introduction of generics in Go 1.18 has opened up new possibilities for code reusability and type safety. However, testing generic functions can present unique challenges.

The Challenge:

One of the hurdles in testing generic functions is the inability to instantiate types for the generic type parameter T. This leads to the need to redefine test logic for each specific type instantiated.

Solution 1: Focus on Common Testing Logic

The runTestCase function in the provided code demonstrates effective abstraction by separating common test logic from type-specific code. Leveraging this function, you can focus on defining test cases with concrete type parameters and expected outcomes.

Solution 2: Consider Testing Different Types Selectively

While testing every possible type permutation may seem comprehensive, it's unnecessary to verify code that works with arbitrary types. By focusing on types that exhibit different behaviors based on specific operators, you can target tests effectively. For example, operators like (addition for numbers, concatenation for strings) or comparison operators (<, >) may necessitate separate tests for different types.

Conclusion:

Testing generic functions requires a careful balance between abstracting common testing logic and addressing specific type differences. By strategically targeting type permutations for testing, you can ensure code robustness while minimizing redundant effort.

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