✨ feat: writing test-files for various functions

[PatrickLaabs]

/kind feature

Describe the solution you'd like
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Anything else you would like to add:
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Environment:

• Cluster-api-provider-vsphere version:
• Cluster-api-provider-azure version:
• Cluster-api-provider-docker version:
• Cluster-api-provider-harvester version:
• Cluster-api-provider-proxmox version:
• cluster-api-provider-vcluster version:
• Kubernetes version: (use kubectl version):
• OS (e.g. from /etc/os-release):