Review and Improve Test Coverage and Alignment for Controller Tests in CronJob Tutorial

[camilamacedo86]

What do you want to happen?

Description:

The current controller tests implemented in the CronJob tutorial (source) provide basic coverage but may benefit from a thorough review. We should ensure that the tests provide sufficient coverage and are fully aligned with Kubebuilder's default scaffolds.

Proposed Changes:

• Review Current Test Coverage: Analyze the existing tests to identify any gaps in coverage, including untested code paths and edge cases.
• Enhance Test Implementation: Update and add more tests, where necessary, to cover all critical parts of the controller logic.
• Alignment with Default Scaffolds: Ensure that the tests follow best practices by comparing them with the default test scaffolds provided by Kubebuilder.
• Fill Implementation Gaps: Address any potential areas where additional test coverage is needed, ensuring that all edge cases and scenarios are considered.

For example, we might want to enhance it as seen in this experimental approach: PR #4070, which introduces improvements in testing methodologies.

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