Refactored the test for `randomStringSecure` to better organize test cases using subtests. Added new test cases to check failures with a broken rand.Reader, improving test coverage and robustness.
Removed `randNum` functions and associated tests from `random_119.go`, `random_121.go`, and `random_122.go`. These functions are no longer necessary. Additionally, replaced `TestRandomNum` and `TestRandomNumZero` with benchmarking for `randomStringSecure`.
This commit introduces a new test case in random_test.go to ensure that the randNum function returns zero when given an input of zero. This helps validate the correctness of edge case handling in the random number generation logic.
Removed error handling from `randNum` in `random_test.go` and introduced new `randNum` implementations for different Go versions (1.19, 1.20-1.21, 1.22+). This ensures compatibility with different versions of Go and utilizes the appropriate version-specific random number generation methods. We are using math/rand instead crypto/rand. For our needs this should be sufficient.