Comparing other internal types, and derived types

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Fortran's interface mechanism enables generic assertion functions that work across multiple types. By creating an interface for `assert_equals` and adding type-specific implementations like `assert_reals_equal` and `assert_strings_equal`, you can write cleaner tests without type names in function calls. The article covers handling different kind-types, comparing derived types by extending interfaces locally, and managing code duplication challenges when supporting multiple numeric precisions.

Fortran - Testing - More assertion functions

Introducing an interface for assert_equals