Intent of history.test|title=History Navigator previous returns null if the current position is the first one|occurrence=1

All 2 exact tests in this concept. Every test is marked by where it enters the hierarchy.

mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/ 2 tests
- base/ 2 tests
  - test/ 2 tests
    
    common/ 2 tests
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/base/test/common/history.test|title=History Navigator previous on first element returns null and remains on first|occurrence=1 Inherited history.test|title=History Navigator previous on first element returns null and remains on first|occurrence=1
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/base/test/common/history.test|title=History Navigator previous returns null if the current position is the first one|occurrence=1 Introduced here