test: add Xcode 26.4 BuildOperationMetrics format test

Add test case for the new BuildOperationMetrics JSON format introduced
in Xcode 26.4 (`counters`/`taskCounters`), verifying both new format
parsing and that old format fields are nil.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: giginet <giginet.net@gmail.com>

Author: giginet

Tests/XCLogParserTests/ActivityParserTests.swift

@@ -178,6 +178,42 @@ class ActivityParserTests: XCTestCase {
         return startTokens + logMessageTokens + endTokens
     }()
 
+    // Xcode 26.4 format: BuildOperationMetrics JSON format changed
+    lazy var IDEActivityLogSectionTokensXcode264: [Token] = {
+        let startTokens = [Token.int(2),
+                           Token.string("com.apple.dt.IDE.BuildLogSection"),
+                           Token.string("Prepare build"),
+                           Token.string("Prepare build"),
+                           Token.double(575479851.278759),
+                           Token.double(575479851.778325),
+                           Token.null,
+                           Token.string("note: Using legacy build system"),
+                           Token.list(1),
+                           Token.className("IDEActivityLogMessage"),
+                           Token.classNameRef("IDEActivityLogMessage"),
+        ]
+        let logMessageTokens = IDEActivityLogMessageTokens
+        let endTokens = [Token.int(1),
+                         Token.int(0),
+                         Token.int(1),
+                         Token.int(42),  // unknown integer before subtitle (Xcode 26.2+)
+                         Token.string("subtitle"),
+                         Token.null,
+                         Token.string("commandDetailDesc"),
+                         Token.string("501796C4-6BE4-4F80-9F9D-3269617ECC17"),
+                         Token.string("localizedResultString"),
+                         Token.string("xcbuildSignature"),
+                         Token.list(1),  // 1 attachment
+                         Token.classNameRef("IDEFoundation.IDEActivityLogSectionAttachment"),
+                         Token.string("com.apple.dt.ActivityLogSectionAttachment.BuildOperationMetrics"),
+                         Token.int(1),
+                         Token.int(0),
+                         // swiftlint:disable:next line_length
+                         Token.json(#"{"counters":{},"taskCounters":{"SwiftDriver":{"moduleDependenciesNotValidatedTasks":1}}}"#),
+        ]
+        return startTokens + logMessageTokens + endTokens
+    }()
+
     let IDEConsoleItemTokens: [Token] = [
         Token.className("IDEConsoleItem"),
         Token.classNameRef("IDEConsoleItem"),
@@ -445,6 +481,42 @@ class ActivityParserTests: XCTestCase {
         XCTAssertEqual(42, logSection.unknown)
     }
 
+    func testParseIDEActivityLogSectionXcode264() throws {
+        parser.logVersion = 12
+        let tokens = IDEActivityLogSectionTokensXcode264
+        var iterator = tokens.makeIterator()
+        let logSection = try parser.parseIDEActivityLogSection(iterator: &iterator)
+        XCTAssertEqual(2, logSection.sectionType)
+        XCTAssertEqual("com.apple.dt.IDE.BuildLogSection", logSection.domainType)
+        XCTAssertEqual("Prepare build", logSection.title)
+        XCTAssertEqual("Prepare build", logSection.signature)
+        XCTAssertEqual(575479851.278759, logSection.timeStartedRecording)
+        XCTAssertEqual(575479851.778325, logSection.timeStoppedRecording)
+        XCTAssertEqual(0, logSection.subSections.count)
+        XCTAssertEqual("note: Using legacy build system", logSection.text)
+        XCTAssertEqual(1, logSection.messages.count)
+        XCTAssertTrue(logSection.wasCancelled)
+        XCTAssertFalse(logSection.isQuiet)
+        XCTAssertTrue(logSection.wasFetchedFromCache)
+        XCTAssertEqual("subtitle", logSection.subtitle)
+        XCTAssertEqual("", logSection.location.documentURLString)
+        XCTAssertEqual(0, logSection.location.timestamp)
+        XCTAssertEqual("commandDetailDesc", logSection.commandDetailDesc)
+        XCTAssertEqual("501796C4-6BE4-4F80-9F9D-3269617ECC17", logSection.uniqueIdentifier)
+        XCTAssertEqual("localizedResultString", logSection.localizedResultString)
+        XCTAssertEqual("xcbuildSignature", logSection.xcbuildSignature)
+        XCTAssertEqual(1, logSection.attachments.count)
+        let metrics = logSection.attachments[0].buildOperationMetrics
+        XCTAssertNotNil(metrics)
+        XCTAssertNil(metrics?.clangCacheHits)
+        XCTAssertNil(metrics?.clangCacheMisses)
+        XCTAssertNil(metrics?.swiftCacheHits)
+        XCTAssertNil(metrics?.swiftCacheMisses)
+        XCTAssertEqual(metrics?.counters, [:])
+        XCTAssertEqual(metrics?.taskCounters?["SwiftDriver"]?["moduleDependenciesNotValidatedTasks"], 1)
+        XCTAssertEqual(42, logSection.unknown)
+    }
+
     func testParseActivityLog() throws {
         let activityLog = try parser.parseIDEActiviyLogFromTokens(IDEActivityLogTokens)
         XCTAssertEqual(10, activityLog.version)