[Enhancement] YAML validation of a TestStep file

[shubham-cmyk]

Fixes #24

• If a nonexisting assert, apply, or error file is present in the test step it will fail
• If TestStep contains any random field ( foo ) it will fail
• It would check the yaml indentation on TestStep, assert files, error files, and apply files. ( Strict decoder )

[shubham-cmyk]

@eddycharly Please Check

[eddycharly]

The right approach would be to use strict unmarshalling.
As in https://github.com/kyverno/kyverno/blob/173bb907b7380292460879c5de80d946a305cda8/cmd/cli/kubectl-kyverno/values/load.go#L18

[shubham-cmyk]

1. Throws error if the referenced file in apply, error or assert doesn't exist.

2. Throws an error if unexpected field is present in TestStep

[chipzoller]

Can you please use code blocks rather than screenshots of terminal output?

[shubham-cmyk]

@chipzoller @eddycharly
Can you check ?

[shubham-cmyk]

• If a nonexisting assert, apply, or error file is present in the test step it will fail
• If TestStep contains any random field ( foo ) it will fail
• It would check the yaml indentation on TestStep, assert files, error files, and apply files. ( Strict decoder )

[eddycharly]

LGTM, thanks !