CodeLens Run Test In Terminal doesn't work (on Windows) due to incorrectly escaped Regex

Description

Ruby LSP Information

VS Code Version

1.104.1

Ruby LSP Extension Version

0.9.32

Ruby LSP Server Version

0.26.1

Ruby LSP Add-ons

• RuboCop (unknown)

Ruby Version

3.1.4

Ruby Version Manager

none

Installed Extensions

Ruby LSP Settings

{
  "indexing": {
    "includedPatterns": [
      "lib/**/*.rb",
      "test/**/*.rb"
    ]
  }
}

{
  "enabledFeatures": {
    "codeActions": true,
    "diagnostics": true,
    "documentHighlights": true,
    "documentLink": true,
    "documentSymbols": true,
    "foldingRanges": true,
    "formatting": false,
    "hover": true,
    "inlayHint": true,
    "onTypeFormatting": false,
    "selectionRanges": true,
    "semanticHighlighting": true,
    "completion": true,
    "codeLens": true,
    "definition": true,
    "workspaceSymbol": true,
    "signatureHelp": true,
    "typeHierarchy": true
  },
  "featuresConfiguration": {},
  "addonSettings": {},
  "rubyVersionManager": {
    "identifier": "none"
  },
  "customRubyCommand": "",
  "formatter": "auto",
  "linters": null,
  "bundleGemfile": "",
  "testTimeout": 30,
  "branch": "",
  "pullDiagnosticsOn": "both",
  "useBundlerCompose": false,
  "bypassTypechecker": false,
  "rubyExecutablePath": "",
  "indexing": {
    "includedPatterns": [
      "lib/**/*.rb",
      "test/**/*.rb"
    ]
  },
  "erbSupport": true,
  "featureFlags": {},
  "sigOpacityLevel": "1"
}

Reproduction steps

1. Start the Ruby LSP using VS Code
2. Open a Ruby test file with a single test
3. Click "Run Test in Terminal"
4. Terminal reports no tests ran

class TestNothing < Minitest::Test
  def test_nothing
    refute_nil true
  end
end

The full file can be tested:

C:\Users\Derk-Jan\...snip...>bundle exec ruby -rC:/Ruby31-x64/lib/ruby/gems/3.1.0/gems/ruby-lsp-0.26.1/lib/ruby_lsp/test_reporters/minitest_reporter.rb -rC:/Ruby31-x64/lib/ruby/gems/3.1.0/gems/ruby-lsp-0.26.1/lib/ruby_lsp/test_reporters/test_unit_reporter.rb -Itest c:/Users/Derk-Jan/...snip.../test/test_nothing.rb --name "/^TestNothing(#|::)/"
Run options: --name "/^TestNothing(#|::)/" --seed 56682

# Running:

.

Finished in 0.015750s, 63.4917 runs/s, 63.4917 assertions/s.

Simplifying this command we see:

bundle exec ruby -rPathToLspProvidedReporter.rb -rPathToAnotherLspProvidedReporter.rb -Itest PathToFile --name "/^TestClassName(#|::)/"

There are three paths:

• PathToLspProvidedReporter
• PathToAnotherLspProvidedReporter
• PathToFile

There is one regex matcher:

• /^TestNothing(#|::)/

For a single test, we get:

C:\Users\Derk-Jan\...snip...>bundle exec ruby -rC:/Ruby31-x64/lib/ruby/gems/3.1.0/gems/ruby-lsp-0.26.1/lib/ruby_lsp/test_reporters/minitest_reporter.rb -rC:/Ruby31-x64/lib/ruby/gems/3.1.0/gems/ruby-lsp-0.26.1/lib/ruby_lsp/test_reporters/test_unit_reporter.rb -Itest c:/Users/Derk-Jan/...snip.../test_nothing.rb --name "/^TestNothing#test_nothing\$/"
Run options: --name "/^TestNothing#test_nothing\\$/" --seed 33369

[...]

Finished in 0.010229s, 0.0000 runs/s, 0.0000 assertions/s.

0 runs, 0 assertions, 0 failures, 0 errors, 0 skips
Nothing ran for filter: /^TestNothing#test_nothing\$/

The issue can be seen in the --name argument:

/^TestNothing#test_nothing\\$/

Removing the extra slash makes the entire command work again.

Trace the Ruby LSP CodeLens “Run Test in Terminal” command construction, using the reported minitest_reporter.rb and test_unit_reporter.rb paths as context. Reproduce the Windows command with the provided TestNothing example and inspect how the single-test regex is escaped. Done means the generated command runs the selected test instead of reporting zero tests.