limited commented on issue #3056: Add experimental end-to-end test framework
URL: https://github.com/apache/trafficcontrol/pull/3056#issuecomment-443776902
 
 
   @rob05c Here are a few really rough notes, didn't have time to write full 
sentences and explanations around them
   
   Components of an end to end test bed
   
   Goals
    - Well documented and extensible - must be very easy for newcomers to 1) 
run existing tests and 2) add a test. 
    - Speed - There may eventually be hundreds/thousands of tests in here. 
Three days for a full run is too long- most tests should run on the order of 
seconds including setup and teardown. 
   
   Setup
     - Minimize external dependencies
     - Separate test execution from resources
         - Flexibility is still important, should be able to run against 
existing testbed (bare metal) or create VMs if needed without impacting the 
test’s topologies and services (really useful for CI or getting new users 
started with the framework)
     - For a CDN a complete framework might be able to create and manipulate 
servers, create caches, DS, even origin servers and content 
     - Failure injection is critical, even into external systems like DNS and 
the network. 
   
   Test Definition
     Prerequisities - Can individual test require certain CDN topology and 
content be present. Can framework create resources if not present (pytest does 
this pretty well with its idea of fixtures)
   
     Execution - *Lots* of common actions between, i.e making HTTP or DNS 
requests. Should be very simple to make a request but extensible if needed. 
i.e. default headers are necessary, but easy to add new headers. Similarly it 
should be really easy to make sure an HTTP request succeeded. If needed, more 
detailed validation should be possible if the test-writer needs. 
   

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