packages/flutter_tools/lib/src/test/coverage_collector.dart - external/github.com/flutter/flutter - Git at Google

 // Copyright 2014 The Flutter Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.


 import 'package:coverage/coverage.dart' as coverage;
 import 'package:meta/meta.dart';
 import 'package:vm_service/vm_service.dart' as vm_service;

 import '../base/file_system.dart';
 import '../base/io.dart';
 import '../base/process.dart';
 import '../globals.dart' as globals;
 import '../vmservice.dart';

 import 'test_device.dart';
 import 'watcher.dart';

 /// A class that collects code coverage data during test runs.
 class CoverageCollector extends TestWatcher {
   CoverageCollector({this.libraryNames, this.verbose = true, required this.packagesPath});

   /// True when log messages should be emitted.
   final bool verbose;

   /// The path to the package_config.json of the package for which code
   /// coverage is computed.
   final String packagesPath;

   /// Map of file path to coverage hit map for that file.
   Map<String, coverage.HitMap>? _globalHitmap;

   /// The names of the libraries to gather coverage for. If null, all libraries
   /// will be accepted.
   Set<String>? libraryNames;

   @override
   Future<void> handleFinishedTest(TestDevice testDevice) async {
     _logMessage('Starting coverage collection');
     await collectCoverage(testDevice);
   }

   void _logMessage(String line, { bool error = false }) {
     if (!verbose) {
       return;
     }
     if (error) {
       globals.printError(line);
     } else {
       globals.printTrace(line);
     }
   }

   void _addHitmap(Map<String, coverage.HitMap> hitmap) {
     if (_globalHitmap == null) {
       _globalHitmap = hitmap;
     } else {
       _globalHitmap!.merge(hitmap);
     }
   }

   /// The directory of the package for which coverage is being collected.
   String get packageDirectory {
     // The coverage package expects the directory of the package itself, and
     // uses that to locate the package_info.json file, which it treats as a
     // private implementation detail. In general, the package_info.json file is
     // located in `.dart_tool/package_info.json` relative to the package
     // directory, so we return the grandparent directory of that file.
     //
     // This may not be a safe assumption in non-standard environments, such as
     // when building under build systems such as Bazel. In those cases, this
     // getter should be overridden.
     return globals.fs.directory(globals.fs.file(packagesPath).dirname).dirname;
   }

   /// Collects coverage for an isolate using the given `port`.
   ///
   /// This should be called when the code whose coverage data is being collected
   /// has been run to completion so that all coverage data has been recorded.
   ///
   /// The returned [Future] completes when the coverage is collected.
   Future<void> collectCoverageIsolate(Uri observatoryUri) async {
     assert(observatoryUri != null);
     _logMessage('collecting coverage data from $observatoryUri...');
     final Map<String, dynamic> data = await collect(observatoryUri, libraryNames);
     if (data == null) {
       throw Exception('Failed to collect coverage.');
     }
     assert(data != null);

     _logMessage('($observatoryUri): collected coverage data; merging...');
     _addHitmap(await coverage.HitMap.parseJson(
       data['coverage'] as List<Map<String, dynamic>>,
       packagePath: packageDirectory,
       checkIgnoredLines: true,
     ));
     _logMessage('($observatoryUri): done merging coverage data into global coverage map.');
   }

   /// Collects coverage for the given [Process] using the given `port`.
   ///
   /// This should be called when the code whose coverage data is being collected
   /// has been run to completion so that all coverage data has been recorded.
   ///
   /// The returned [Future] completes when the coverage is collected.
   Future<void> collectCoverage(TestDevice testDevice) async {
     assert(testDevice != null);

     Map<String, dynamic>? data;

     final Future<void> processComplete = testDevice.finished.catchError(
       (Object error) => throw Exception(
           'Failed to collect coverage, test device terminated prematurely with '
           'error: ${(error as TestDeviceException).message}.'),
       test: (Object error) => error is TestDeviceException,
     );

     final Future<void> collectionComplete = testDevice.observatoryUri
       .then((Uri? observatoryUri) {
         _logMessage('collecting coverage data from $testDevice at $observatoryUri...');
         return collect(observatoryUri, libraryNames)
           .then<void>((Map<String, dynamic> result) {
             if (result == null) {
               throw Exception('Failed to collect coverage.');
             }
             _logMessage('Collected coverage data.');
             data = result;
           });
       });

     await Future.any<void>(<Future<void>>[ processComplete, collectionComplete ]);
     assert(data != null);

     _logMessage('Merging coverage data...');
     _addHitmap(await coverage.HitMap.parseJson(
       data!['coverage'] as List<Map<String, dynamic>>,
       packagePath: packageDirectory,
       checkIgnoredLines: true,
     ));
     _logMessage('Done merging coverage data into global coverage map.');
   }

   /// Returns formatted coverage data once all coverage data has been collected.
   ///
   /// This will not start any collection tasks. It us up to the caller of to
   /// call [collectCoverage] for each process first.
   Future<String?> finalizeCoverage({
     String Function(Map<String, coverage.HitMap> hitmap)? formatter,
     coverage.Resolver? resolver,
     Directory? coverageDirectory,
   }) async {
     if (_globalHitmap == null) {
       return null;
     }
     if (formatter == null) {
       resolver ??= await coverage.Resolver.create(packagesPath: packagesPath);
       final String packagePath = globals.fs.currentDirectory.path;
       final List<String> reportOn = coverageDirectory == null
           ? <String>[globals.fs.path.join(packagePath, 'lib')]
           : <String>[coverageDirectory.path];
       formatter = (Map<String, coverage.HitMap> hitmap) => hitmap
           .formatLcov(resolver!, reportOn: reportOn, basePath: packagePath);
     }
     final String result = formatter(_globalHitmap!);
     _globalHitmap = null;
     return result;
   }

   Future<bool> collectCoverageData(String? coveragePath, { bool mergeCoverageData = false, Directory? coverageDirectory }) async {
     final String? coverageData = await finalizeCoverage(
       coverageDirectory: coverageDirectory,
     );
     _logMessage('coverage information collection complete');
     if (coverageData == null) {
       return false;
     }

     final File coverageFile = globals.fs.file(coveragePath)
       ..createSync(recursive: true)
       ..writeAsStringSync(coverageData, flush: true);
     _logMessage('wrote coverage data to $coveragePath (size=${coverageData.length})');

     const String baseCoverageData = 'coverage/lcov.base.info';
     if (mergeCoverageData) {
       if (!globals.fs.isFileSync(baseCoverageData)) {
         _logMessage('Missing "$baseCoverageData". Unable to merge coverage data.', error: true);
         return false;
       }

       if (globals.os.which('lcov') == null) {
         String installMessage = 'Please install lcov.';
         if (globals.platform.isLinux) {
           installMessage = 'Consider running "sudo apt-get install lcov".';
         } else if (globals.platform.isMacOS) {
           installMessage = 'Consider running "brew install lcov".';
         }
         _logMessage('Missing "lcov" tool. Unable to merge coverage data.\n$installMessage', error: true);
         return false;
       }

       final Directory tempDir = globals.fs.systemTempDirectory.createTempSync('flutter_tools_test_coverage.');
       try {
         final File sourceFile = coverageFile.copySync(globals.fs.path.join(tempDir.path, 'lcov.source.info'));
         final RunResult result = globals.processUtils.runSync(<String>[
           'lcov',
           '--add-tracefile', baseCoverageData,
           '--add-tracefile', sourceFile.path,
           '--output-file', coverageFile.path,
         ]);
         if (result.exitCode != 0) {
           return false;
         }
       } finally {
         tempDir.deleteSync(recursive: true);
       }
     }
     return true;
   }

   @override
   Future<void> handleTestCrashed(TestDevice testDevice) async { }

   @override
   Future<void> handleTestTimedOut(TestDevice testDevice) async { }
 }

 Future<FlutterVmService> _defaultConnect(Uri? serviceUri) {
   return connectToVmService(
       serviceUri!, compression: CompressionOptions.compressionOff, logger: globals.logger,);
 }

 Future<Map<String, dynamic>> collect(Uri? serviceUri, Set<String>? libraryNames, {
   bool waitPaused = false,
   String? debugName,
   Future<FlutterVmService> Function(Uri?) connector = _defaultConnect,
   @visibleForTesting bool forceSequential = false,
 }) async {
   final FlutterVmService vmService = await connector(serviceUri);
   final Map<String, dynamic> result = await _getAllCoverage(vmService.service, libraryNames, forceSequential);
   await vmService.dispose();
   return result;
 }

 Future<Map<String, dynamic>> _getAllCoverage(
   vm_service.VmService service,
   Set<String>? libraryNames,
   bool forceSequential,
 ) async {
   final vm_service.Version version = await service.getVersion();
   final bool libraryFilters = (version.major == 3 && version.minor! >= 57) || version.major! > 3;
   final vm_service.VM vm = await service.getVM();
   final List<Map<String, dynamic>> coverage = <Map<String, dynamic>>[];
   bool libraryPredicate(String? libraryName) {
     if (libraryNames == null) {
       return true;
     }
     final Uri uri = Uri.parse(libraryName!);
     if (uri.scheme != 'package') {
       return false;
     }
     final String scope = uri.path.split('/').first;
     return libraryNames.contains(scope);
   }
   for (final vm_service.IsolateRef isolateRef in vm.isolates!) {
     if (isolateRef.isSystemIsolate!) {
       continue;
     }
     if (libraryFilters) {
       final vm_service.SourceReport sourceReport = await service.getSourceReport(
           isolateRef.id!,
           <String>['Coverage'],
           forceCompile: true,
           reportLines: true,
           libraryFilters: libraryNames == null ? null : List<String>.from(
               libraryNames.map((String name) => 'package:$name/')),
         );
       _buildCoverageMap(
           <String, vm_service.Script>{},
           <vm_service.SourceReport>[sourceReport],
           coverage,
         );
     } else {
       vm_service.ScriptList scriptList;
       try {
         scriptList = await service.getScripts(isolateRef.id!);
       } on vm_service.SentinelException {
         continue;
       }

       final List<Future<void>> futures = <Future<void>>[];
       final Map<String, vm_service.Script> scripts = <String, vm_service.Script>{};
       final List<vm_service.SourceReport> sourceReports = <vm_service.SourceReport>[];

       // For each ScriptRef loaded into the VM, load the corresponding Script
       // and SourceReport object.
       for (final vm_service.ScriptRef script in scriptList.scripts!) {
         final String? libraryUri = script.uri;
         if (!libraryPredicate(libraryUri)) {
           continue;
         }
         final String? scriptId = script.id;
         final Future<void> getSourceReport = service.getSourceReport(
           isolateRef.id!,
           <String>['Coverage'],
           scriptId: scriptId,
           forceCompile: true,
           reportLines: true,
         )
         .then((vm_service.SourceReport report) {
           sourceReports.add(report);
         });
         if (forceSequential) {
           await null;
         }
         futures.add(getSourceReport);
       }
       await Future.wait(futures);
       _buildCoverageMap(scripts, sourceReports, coverage);
     }
   }
   return <String, dynamic>{'type': 'CodeCoverage', 'coverage': coverage};
 }

 // Build a hitmap of Uri -> Line -> Hit Count for each script object.
 void _buildCoverageMap(
   Map<String, vm_service.Script> scripts,
   List<vm_service.SourceReport> sourceReports,
   List<Map<String, dynamic>> coverage,
 ) {
   final Map<String?, Map<int, int>> hitMaps = <String?, Map<int, int>>{};
   for (final vm_service.SourceReport sourceReport  in sourceReports) {
     for (final vm_service.SourceReportRange range in sourceReport.ranges!) {
       final vm_service.SourceReportCoverage? coverage = range.coverage;
       // Coverage reports may sometimes be null for a Script.
       if (coverage == null) {
         continue;
       }
       final vm_service.ScriptRef scriptRef = sourceReport.scripts![range.scriptIndex!];
       final String? uri = scriptRef.uri;

       hitMaps[uri] ??= <int, int>{};
       final Map<int, int>? hitMap = hitMaps[uri];
       final List<int>? hits = coverage.hits;
       final List<int>? misses = coverage.misses;
       if (hits != null) {
         for (final int line in hits) {
           final int current = hitMap![line] ?? 0;
           hitMap[line] = current + 1;
         }
       }
       if (misses != null) {
         for (final int line in misses) {
           hitMap![line] ??= 0;
         }
       }
     }
   }
   hitMaps.forEach((String? uri, Map<int, int> hitMap) {
     coverage.add(_toScriptCoverageJson(uri!, hitMap));
   });
 }

 // Returns a JSON hit map backward-compatible with pre-1.16.0 SDKs.
 Map<String, dynamic> _toScriptCoverageJson(String scriptUri, Map<int, int> hitMap) {
   final Map<String, dynamic> json = <String, dynamic>{};
   final List<int> hits = <int>[];
   hitMap.forEach((int line, int hitCount) {
     hits.add(line);
     hits.add(hitCount);
   });
   json['source'] = scriptUri;
   json['script'] = <String, dynamic>{
     'type': '@Script',
     'fixedId': true,
     'id': 'libraries/1/scripts/${Uri.encodeComponent(scriptUri)}',
     'uri': scriptUri,
     '_kind': 'library',
   };
   json['hits'] = hits;
   return json;
 }
	// Copyright 2014 The Flutter Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.



	import 'package:coverage/coverage.dart' as coverage;
	import 'package:meta/meta.dart';
	import 'package:vm_service/vm_service.dart' as vm_service;

	import '../base/file_system.dart';
	import '../base/io.dart';
	import '../base/process.dart';
	import '../globals.dart' as globals;
	import '../vmservice.dart';

	import 'test_device.dart';
	import 'watcher.dart';

	/// A class that collects code coverage data during test runs.
	class CoverageCollector extends TestWatcher {
	CoverageCollector({this.libraryNames, this.verbose = true, required this.packagesPath});

	/// True when log messages should be emitted.
	final bool verbose;

	/// The path to the package_config.json of the package for which code
	/// coverage is computed.
	final String packagesPath;

	/// Map of file path to coverage hit map for that file.
	Map<String, coverage.HitMap>? _globalHitmap;

	/// The names of the libraries to gather coverage for. If null, all libraries
	/// will be accepted.
	Set<String>? libraryNames;

	@override
	Future<void> handleFinishedTest(TestDevice testDevice) async {
	_logMessage('Starting coverage collection');
	await collectCoverage(testDevice);
	}

	void _logMessage(String line, { bool error = false }) {
	if (!verbose) {
	return;
	}
	if (error) {
	globals.printError(line);
	} else {
	globals.printTrace(line);
	}
	}

	void _addHitmap(Map<String, coverage.HitMap> hitmap) {
	if (_globalHitmap == null) {
	_globalHitmap = hitmap;
	} else {
	_globalHitmap!.merge(hitmap);
	}
	}

	/// The directory of the package for which coverage is being collected.
	String get packageDirectory {
	// The coverage package expects the directory of the package itself, and
	// uses that to locate the package_info.json file, which it treats as a
	// private implementation detail. In general, the package_info.json file is
	// located in `.dart_tool/package_info.json` relative to the package
	// directory, so we return the grandparent directory of that file.
	//
	// This may not be a safe assumption in non-standard environments, such as
	// when building under build systems such as Bazel. In those cases, this
	// getter should be overridden.
	return globals.fs.directory(globals.fs.file(packagesPath).dirname).dirname;
	}

	/// Collects coverage for an isolate using the given `port`.
	///
	/// This should be called when the code whose coverage data is being collected
	/// has been run to completion so that all coverage data has been recorded.
	///
	/// The returned [Future] completes when the coverage is collected.
	Future<void> collectCoverageIsolate(Uri observatoryUri) async {
	assert(observatoryUri != null);
	_logMessage('collecting coverage data from $observatoryUri...');
	final Map<String, dynamic> data = await collect(observatoryUri, libraryNames);
	if (data == null) {
	throw Exception('Failed to collect coverage.');
	}
	assert(data != null);

	_logMessage('($observatoryUri): collected coverage data; merging...');
	_addHitmap(await coverage.HitMap.parseJson(
	data['coverage'] as List<Map<String, dynamic>>,
	packagePath: packageDirectory,
	checkIgnoredLines: true,
	));
	_logMessage('($observatoryUri): done merging coverage data into global coverage map.');
	}

	/// Collects coverage for the given [Process] using the given `port`.
	///
	/// This should be called when the code whose coverage data is being collected
	/// has been run to completion so that all coverage data has been recorded.
	///
	/// The returned [Future] completes when the coverage is collected.
	Future<void> collectCoverage(TestDevice testDevice) async {
	assert(testDevice != null);

	Map<String, dynamic>? data;

	final Future<void> processComplete = testDevice.finished.catchError(
	(Object error) => throw Exception(
	'Failed to collect coverage, test device terminated prematurely with '
	'error: ${(error as TestDeviceException).message}.'),
	test: (Object error) => error is TestDeviceException,
	);

	final Future<void> collectionComplete = testDevice.observatoryUri
	.then((Uri? observatoryUri) {
	_logMessage('collecting coverage data from $testDevice at $observatoryUri...');
	return collect(observatoryUri, libraryNames)
	.then<void>((Map<String, dynamic> result) {
	if (result == null) {
	throw Exception('Failed to collect coverage.');
	}
	_logMessage('Collected coverage data.');
	data = result;
	});
	});

	await Future.any<void>(<Future<void>>[ processComplete, collectionComplete ]);
	assert(data != null);

	_logMessage('Merging coverage data...');
	_addHitmap(await coverage.HitMap.parseJson(
	data!['coverage'] as List<Map<String, dynamic>>,
	packagePath: packageDirectory,
	checkIgnoredLines: true,
	));
	_logMessage('Done merging coverage data into global coverage map.');
	}

	/// Returns formatted coverage data once all coverage data has been collected.
	///
	/// This will not start any collection tasks. It us up to the caller of to
	/// call [collectCoverage] for each process first.
	Future<String?> finalizeCoverage({
	String Function(Map<String, coverage.HitMap> hitmap)? formatter,
	coverage.Resolver? resolver,
	Directory? coverageDirectory,
	}) async {
	if (_globalHitmap == null) {
	return null;
	}
	if (formatter == null) {
	resolver ??= await coverage.Resolver.create(packagesPath: packagesPath);
	final String packagePath = globals.fs.currentDirectory.path;
	final List<String> reportOn = coverageDirectory == null
	? <String>[globals.fs.path.join(packagePath, 'lib')]
	: <String>[coverageDirectory.path];
	formatter = (Map<String, coverage.HitMap> hitmap) => hitmap
	.formatLcov(resolver!, reportOn: reportOn, basePath: packagePath);
	}
	final String result = formatter(_globalHitmap!);
	_globalHitmap = null;
	return result;
	}

	Future<bool> collectCoverageData(String? coveragePath, { bool mergeCoverageData = false, Directory? coverageDirectory }) async {
	final String? coverageData = await finalizeCoverage(
	coverageDirectory: coverageDirectory,
	);
	_logMessage('coverage information collection complete');
	if (coverageData == null) {
	return false;
	}

	final File coverageFile = globals.fs.file(coveragePath)
	..createSync(recursive: true)
	..writeAsStringSync(coverageData, flush: true);
	_logMessage('wrote coverage data to $coveragePath (size=${coverageData.length})');

	const String baseCoverageData = 'coverage/lcov.base.info';
	if (mergeCoverageData) {
	if (!globals.fs.isFileSync(baseCoverageData)) {
	_logMessage('Missing "$baseCoverageData". Unable to merge coverage data.', error: true);
	return false;
	}

	if (globals.os.which('lcov') == null) {
	String installMessage = 'Please install lcov.';
	if (globals.platform.isLinux) {
	installMessage = 'Consider running "sudo apt-get install lcov".';
	} else if (globals.platform.isMacOS) {
	installMessage = 'Consider running "brew install lcov".';
	}
	_logMessage('Missing "lcov" tool. Unable to merge coverage data.\n$installMessage', error: true);
	return false;
	}

	final Directory tempDir = globals.fs.systemTempDirectory.createTempSync('flutter_tools_test_coverage.');
	try {
	final File sourceFile = coverageFile.copySync(globals.fs.path.join(tempDir.path, 'lcov.source.info'));
	final RunResult result = globals.processUtils.runSync(<String>[
	'lcov',
	'--add-tracefile', baseCoverageData,
	'--add-tracefile', sourceFile.path,
	'--output-file', coverageFile.path,
	]);
	if (result.exitCode != 0) {
	return false;
	}
	} finally {
	tempDir.deleteSync(recursive: true);
	}
	}
	return true;
	}

	@override
	Future<void> handleTestCrashed(TestDevice testDevice) async { }

	@override
	Future<void> handleTestTimedOut(TestDevice testDevice) async { }
	}

	Future<FlutterVmService> _defaultConnect(Uri? serviceUri) {
	return connectToVmService(
	serviceUri!, compression: CompressionOptions.compressionOff, logger: globals.logger,);
	}

	Future<Map<String, dynamic>> collect(Uri? serviceUri, Set<String>? libraryNames, {
	bool waitPaused = false,
	String? debugName,
	Future<FlutterVmService> Function(Uri?) connector = _defaultConnect,
	@visibleForTesting bool forceSequential = false,
	}) async {
	final FlutterVmService vmService = await connector(serviceUri);
	final Map<String, dynamic> result = await _getAllCoverage(vmService.service, libraryNames, forceSequential);
	await vmService.dispose();
	return result;
	}

	Future<Map<String, dynamic>> _getAllCoverage(
	vm_service.VmService service,
	Set<String>? libraryNames,
	bool forceSequential,
	) async {
	final vm_service.Version version = await service.getVersion();
	final bool libraryFilters = (version.major == 3 && version.minor! >= 57) \|\| version.major! > 3;
	final vm_service.VM vm = await service.getVM();
	final List<Map<String, dynamic>> coverage = <Map<String, dynamic>>[];
	bool libraryPredicate(String? libraryName) {
	if (libraryNames == null) {
	return true;
	}
	final Uri uri = Uri.parse(libraryName!);
	if (uri.scheme != 'package') {
	return false;
	}
	final String scope = uri.path.split('/').first;
	return libraryNames.contains(scope);
	}
	for (final vm_service.IsolateRef isolateRef in vm.isolates!) {
	if (isolateRef.isSystemIsolate!) {
	continue;
	}
	if (libraryFilters) {
	final vm_service.SourceReport sourceReport = await service.getSourceReport(
	isolateRef.id!,
	<String>['Coverage'],
	forceCompile: true,
	reportLines: true,
	libraryFilters: libraryNames == null ? null : List<String>.from(
	libraryNames.map((String name) => 'package:$name/')),
	);
	_buildCoverageMap(
	<String, vm_service.Script>{},
	<vm_service.SourceReport>[sourceReport],
	coverage,
	);
	} else {
	vm_service.ScriptList scriptList;
	try {
	scriptList = await service.getScripts(isolateRef.id!);
	} on vm_service.SentinelException {
	continue;
	}

	final List<Future<void>> futures = <Future<void>>[];
	final Map<String, vm_service.Script> scripts = <String, vm_service.Script>{};
	final List<vm_service.SourceReport> sourceReports = <vm_service.SourceReport>[];

	// For each ScriptRef loaded into the VM, load the corresponding Script
	// and SourceReport object.
	for (final vm_service.ScriptRef script in scriptList.scripts!) {
	final String? libraryUri = script.uri;
	if (!libraryPredicate(libraryUri)) {
	continue;
	}
	final String? scriptId = script.id;
	final Future<void> getSourceReport = service.getSourceReport(
	isolateRef.id!,
	<String>['Coverage'],
	scriptId: scriptId,
	forceCompile: true,
	reportLines: true,
	)
	.then((vm_service.SourceReport report) {
	sourceReports.add(report);
	});
	if (forceSequential) {
	await null;
	}
	futures.add(getSourceReport);
	}
	await Future.wait(futures);
	_buildCoverageMap(scripts, sourceReports, coverage);
	}
	}
	return <String, dynamic>{'type': 'CodeCoverage', 'coverage': coverage};
	}

	// Build a hitmap of Uri -> Line -> Hit Count for each script object.
	void _buildCoverageMap(
	Map<String, vm_service.Script> scripts,
	List<vm_service.SourceReport> sourceReports,
	List<Map<String, dynamic>> coverage,
	) {
	final Map<String?, Map<int, int>> hitMaps = <String?, Map<int, int>>{};
	for (final vm_service.SourceReport sourceReport in sourceReports) {
	for (final vm_service.SourceReportRange range in sourceReport.ranges!) {
	final vm_service.SourceReportCoverage? coverage = range.coverage;
	// Coverage reports may sometimes be null for a Script.
	if (coverage == null) {
	continue;
	}
	final vm_service.ScriptRef scriptRef = sourceReport.scripts![range.scriptIndex!];
	final String? uri = scriptRef.uri;

	hitMaps[uri] ??= <int, int>{};
	final Map<int, int>? hitMap = hitMaps[uri];
	final List<int>? hits = coverage.hits;
	final List<int>? misses = coverage.misses;
	if (hits != null) {
	for (final int line in hits) {
	final int current = hitMap![line] ?? 0;
	hitMap[line] = current + 1;
	}
	}
	if (misses != null) {
	for (final int line in misses) {
	hitMap![line] ??= 0;
	}
	}
	}
	}
	hitMaps.forEach((String? uri, Map<int, int> hitMap) {
	coverage.add(_toScriptCoverageJson(uri!, hitMap));
	});
	}

	// Returns a JSON hit map backward-compatible with pre-1.16.0 SDKs.
	Map<String, dynamic> _toScriptCoverageJson(String scriptUri, Map<int, int> hitMap) {
	final Map<String, dynamic> json = <String, dynamic>{};
	final List<int> hits = <int>[];
	hitMap.forEach((int line, int hitCount) {
	hits.add(line);
	hits.add(hitCount);
	});
	json['source'] = scriptUri;
	json['script'] = <String, dynamic>{
	'type': '@Script',
	'fixedId': true,
	'id': 'libraries/1/scripts/${Uri.encodeComponent(scriptUri)}',
	'uri': scriptUri,
	'_kind': 'library',
	};
	json['hits'] = hits;
	return json;
	}