Differentiate test cases for certificate_complete_chain

[JensHeinrich]

SUMMARY

Create more differentiated test cases

ISSUE TYPE

• Feature Idea

COMPONENT NAME

certificate_complete_chain

ADDITIONAL INFORMATION

Test cases that should be considered:

• Intermediate certificates from directory and root certificate from pem
• Intermediate and root certificates from directory
• Failing test as described in #355
• Failing test because root certificate is not included in specified directory
• Failing test because root certificate is wrong (but pem is specified explicitly)
• Failing test because intermediate certificate is not included in specified directory
• Failing test because intermediate certificate is wrong (but pem is specified explicitly)

[shk3bq4d]

maybe see #399