How Can I Effectively Table Test Generic Functions in Go?

Table Testing Generics in Go: Addressing the Pitfalls

In Go 1.18, the introduction of generics brings exciting possibilities, but also presents challenges. One such challenge is the testing of generic functions with table-based approaches.

The Dilemma: Repetitive Testing Logic

When table testing generic functions, one encounters the issue of redeclaring testing logic for each function. This is a result of the inability to instantiate T values directly in the generic function signature.

A Pragmatic Approach

Despite this limitation, achieving table testing for generics requires a practical solution:

func runTestCase[T Item](tc testCase[T]) func(t *testing.T) {
    return func(t *testing.T) {
        tc.start.add(tc.key, tc.val)
        assert.Equal(t, tc.start, tc.expected)
    }
}

This helper function abstracts away common test setup and verification logic, regardless of the specific T type being tested.

Selective Testing: A Sensible Compromise

It's important to recognize that exhaustive testing of every possible T type is often unnecessary. The purpose of generics is to create code that operates seamlessly on any compliant type. Therefore, unit tests should primarily focus on scenarios where different types exhibit distinct behaviors, particularly when it comes to operators with varying interpretations (e.g., for numeric types vs. string concatenation).

Seek Inspiration: Lessons from the Community

When faced with similar challenges, referring to discussions within the community can provide valuable insights. In this case, the following thread offers additional perspectives:

• [Go Forum: Testing functions which use generics](https://forum.golangbridge.org/t/testing-functions-which-use-generics/11272/11)

Through practical solutions and a balanced approach to testing, it's possible to effectively test generic functions in Go 1.18 and unlock their full potential.

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