---
MainSourceFile:     source2.cpp
Diagnostics:
  - BuildDirectory: $(path)
    DiagnosticName: test-relative-path
    DiagnosticMessage:
      Message: Fix
      FilePath: ./basic.h
      FileOffset: 148
      Replacements:
        - FilePath:        ./basic.h
          Offset:          298
          Length:          1
          ReplacementText: elem
...