Implement test discovery for swift-testing tests for the textDocument/tests request

This allows us to return swift-testing tests within a single document. It does not look for swift-testing tests workspace-wide (the `workspace/tests` request), which will be a follow-up PR.

Author: ahoppen

Sources/LanguageServerProtocol/SupportTypes/TestItem.swift

@@ -38,6 +38,12 @@ public struct TestItem: ResponseType, Equatable {
   /// When `nil` the `label` is used.
   public let sortText: String?
 
+  /// Whether the test is disabled.
+  public let disabled: Bool
+
+  /// The type of test, eg. the testing framework that was used to declare the test.
+  public let style: String
+
   /// The location of the test item in the source code.
   public let location: Location
 
@@ -47,11 +53,16 @@ public struct TestItem: ResponseType, Equatable {
   /// Tags associated with this test item.
   public let tags: [TestTag]
 
+  public static let testStyleXCTest = "XCTest"
+  public static let testStyleSwiftTesting = "swift-testing"
+
   public init(
     id: String,
     label: String,
     description: String? = nil,
     sortText: String? = nil,
+    disabled: Bool,
+    style: String,
     location: Location,
     children: [TestItem],
     tags: [TestTag]
@@ -60,6 +71,8 @@ public struct TestItem: ResponseType, Equatable {
     self.label = label
     self.description = description
     self.sortText = sortText
+    self.disabled = disabled
+    self.style = style
     self.location = location
     self.children = children
     self.tags = tags

Sources/SourceKitLSP/CMakeLists.txt

@@ -38,6 +38,7 @@ target_sources(SourceKitLSP PRIVATE
   Swift/SourceKitD+ResponseError.swift
   Swift/SwiftCommand.swift
   Swift/SwiftLanguageService.swift
+  Swift/SwiftTestingScanner.swift
   Swift/SymbolInfo.swift
   Swift/SyntaxHighlightingToken.swift
   Swift/SyntaxHighlightingTokenParser.swift