How to Share Code Between Test Files in a Go Package?

Where to Store Shared Code for Tests in a Go Package?

When organizing a Go package with multiple files, it's common practice to create a corresponding test file for each source file. However, when tests require common helper functions, it can be cumbersome to duplicate the code across test files.

Solution:

The recommended solution is to place shared code for tests within any of the test files. Despite being in different files, test files within the same package belong to the same test package and can access each other's exported and unexported identifiers without import statements.

Best Practices:

• Create a separate _test.go file for each source file if desired, but it's not mandatory.
• Use the same package clause in test files for black-box testing (package a_test and b_test for package a).
• Use package a in test files for white-box testing, enabling access to identifiers from different test files.
• Note that different package clauses in test files will result in separate test packages, preventing access to shared code.

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