Filter backticks in TestItem IDs

Test functions with backticks in their identifier should have them
filtered out.

This is a stopgap until swiftlang/swift-syntax#2576 is ready.

Author: plemarquand

Sources/LanguageServerProtocol/SupportTypes/TestItem.swift

@@ -67,8 +67,10 @@ public struct TestItem: ResponseType, Equatable {
     children: [TestItem],
     tags: [TestTag]
   ) {
-    self.id = id
-    self.label = label
+    // Filtering backticks is temporary until we can use
+    // https://github.com/apple/swift-syntax/pull/2576
+    self.id = id.filter { $0 != "`" }
+    self.label = id == label ? self.id : label
     self.description = description
     self.sortText = sortText
     self.disabled = disabled

Tests/SourceKitLSPTests/DocumentTestDiscoveryTests.swift

@@ -483,6 +483,39 @@ final class DocumentTestDiscoveryTests: XCTestCase {
     )
   }
 
+  func testSwiftTestingTestWithBackticksInName() async throws {
+    let testClient = try await TestSourceKitLSPClient()
+    let uri = DocumentURI.for(.swift)
+
+    let positions = testClient.openDocument(
+      """
+      import Testing
+
+      1️⃣@Test
+      func `oneIsTwo`(`foo`: Int) {
+        #expect(1 == 2)
+      }2️⃣
+      """,
+      uri: uri
+    )
+
+    let tests = try await testClient.send(DocumentTestsRequest(textDocument: TextDocumentIdentifier(uri)))
+    XCTAssertEqual(
+      tests,
+      [
+        TestItem(
+          id: "oneIsTwo(foo:)",
+          label: "oneIsTwo(foo:)",
+          disabled: false,
+          style: TestStyle.swiftTesting,
+          location: Location(uri: uri, range: positions["1️⃣"]..<positions["2️⃣"]),
+          children: [],
+          tags: []
+        )
+      ]
+    )
+  }
+
   func testDisabledSwiftTestingTest() async throws {
     let testClient = try await TestSourceKitLSPClient()
     let uri = DocumentURI.for(.swift)