spline-test tool

[Nachtfeuer]

There's a Bash tool bats but I feel that the spline way with yaml would be more comfortable. That's why to considere following new yaml format for testing Bash code:

suite:
   "Verifying that a == b":
      test: |
          echo "hello"
          test 2 == 3
       verify: |
           assert {{ test.output }} == "hello"
           assert {{ test.exit_code }} == 0

Following features:

• each test (script) is Bash code
• each verification (script) is Python code
• is capable to generate TAP report (useful for Jenkins)
• tests can be filtered (substr search in title: --filter)
• individual file or files in a path (recursively) with pattern test*.yaml (and test*.yml) will be fetched
• running tests randomly by default (adjustable seed supported)
• should be part of spline and so installed with spline
• support for model as done for spline yaml
• support for Jinja2 templating (model and env)
• tests can run in parallell (--parallel)