pkg/identifiers: add tests for ValidateDockerCompat - #5088
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pkg/identifiers had no test coverage, though ValidateDockerCompat gates container, volume, and network names across the codebase. Add table-driven tests for the accepted charset, the Docker-compatible two-character minimum, leading-separator and invalid-character rejection, and the empty case, asserting both the message and the wrapped errdefs.ErrInvalidArgument. Signed-off-by: Nikolaus Schuetz <nikolauspschuetz@gmail.com>
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pkg/identifiershad no tests, even thoughValidateDockerCompatvalidates container, volume, and network names throughout the codebase. This adds table-driven coverage: the accepted charset (alphanumeric plus_.-), the Docker-compatible two-character minimum, rejection of leading separators and invalid characters, and the empty-string case. Each error case also asserts the wrappederrdefs.ErrInvalidArgument.Test-only, no behavior change.