Support assert 'failedTemplate' to catch a substring and regex in error message

[ivankatliarchuk]

It would help if we can support assert 'failedTemplate' to catch a regex or a substrict, without requiring to specify a full message.

Something like:

tests:
  - it: 
    template:
    asserts:
      - failedTemplate:
          contains: "a text"
      - failedTemplate:
          matchRegexPattern: "^namespace:"

The format could be any, as long as functionality is supported.

[quintush]

Hello @ivankatliarchuk,

Thanks for the suggestion.
Will look into it and will try to combine it with #218.

The last change on the failedTemplate assertion, did not achieve the goal I wanted to reach. 😟

Greetings,
@quintush

[alexandreribeiro]

+1 to this feature :)

[falcasantos]

+1 to this as well!