Intent of Registry registry - mixin, fails on duplicate ids|occurrence=1

All 1 exact test in this concept. Every test is marked by where it enters the hierarchy.

mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/ 1 test
- platform/ 1 test
  - registry/ 1 test
    
    test/ 1 test
    
    common/ 1 test
    
    platform.test|title=Platform / 1 test
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/platform/registry/test/common/platform.test|title=Platform / Registry registry - mixin, fails on duplicate ids|occurrence=1 Introduced here