[analysis_server] Extract LSP request helpers to allow reuse in LSP-over-Legacy tests

The mixin `LspAnalysisServerTestMixin` contains a lot of helpers for interacting with the LSP server in tests and is used by both the in-process tests and the out-of-process integration tests.

We now have a third category of LSP tests that would benefit from many of these helpers (such as "getHover()") but are not talking to a native LSP server.

This change splits those helpers out into `LspRequestHelpersMixin` which contains only the request helpers without any code assuming a native LSP server, so they can be used by LSP-over-Legacy tests.

All code in `request_helpers_mixin.dart` was lifted directly from `server_abstract.dart` with no changes.

It also adds a test that error responses in LSP-over-Legacy are handled appropriately.

Change-Id: I847855a5314b5b04d700c6400b67e76e5f0d3402
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/313362
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Brian Wilkerson <brianwilkerson@google.com>
4 files changed
tree: 8dc81e46c7549b5295ceccfdffe8c6e07d50b8ec
  1. .dart_tool/
  2. .github/
  3. benchmarks/
  4. build/
  5. docs/
  6. pkg/
  7. runtime/
  8. samples/
  9. sdk/
  10. tests/
  11. third_party/
  12. tools/
  13. utils/
  14. .clang-format
  15. .gitattributes
  16. .gitconfig
  17. .gitignore
  18. .gn
  19. .mailmap
  20. .style.yapf
  21. .vpython
  22. AUTHORS
  23. BUILD.gn
  24. CHANGELOG.md
  25. codereview.settings
  26. CONTRIBUTING.md
  27. DEPS
  28. LICENSE
  29. OWNERS
  30. PATENT_GRANT
  31. PRESUBMIT.py
  32. README.dart-sdk
  33. README.md
  34. sdk.code-workspace
  35. sdk_args.gni
  36. SECURITY.md
  37. WATCHLISTS
README.md

Dart

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