Move generated files to gen/.

test/codegen_test.dart

Index: test/codegen_test.dart
diff --git a/test/codegen_test.dart b/test/codegen_test.dart
index 8e13891b9f76236f3e7181f2383ed90e07c2b6b3..c2157088166e8f477da07737f1426546c3f9a2c8 100644
--- a/test/codegen_test.dart
+++ b/test/codegen_test.dart
@@ -3,10 +3,15 @@
 // BSD-style license that can be found in the LICENSE file.
 
 /// Tests code generation.
+///
 /// Runs Dart Dev Compiler on all input in the `codegen` directory and checks
 /// that the output is what we expected.
 library dev_compiler.test.codegen_test;
 
+// TODO(rnystrom): This doesn't actually run any tests any more. It just
+// compiles stuff. This should be changed to not use unittest and just be a
+// regular program that outputs files.
+
 import 'dart:convert' show JSON;
 import 'dart:io' show Directory, File, Platform;
 import 'package:args/args.dart' show ArgParser, ArgResults;
@@ -24,7 +29,7 @@ import 'package:analyzer/src/generated/source.dart' show Source;
 import 'package:dev_compiler/src/analyzer/context.dart' show AnalyzerOptions;
 import 'package:dev_compiler/src/compiler/compiler.dart'
     show BuildUnit, CompilerOptions, ModuleCompiler;
-import 'testing.dart' show testDirectory;
+import 'testing.dart' show repoDirectory, testDirectory;
 import 'multitest.dart' show extractTestsFromMultitest, isMultiTest;
 import '../tool/build_sdk.dart' as build_sdk;
 import 'package:dev_compiler/src/compiler/compiler.dart';
@@ -32,12 +37,48 @@ import 'package:dev_compiler/src/compiler/compiler.dart';
 final ArgParser argParser = new ArgParser()
   ..addOption('dart-sdk', help: 'Dart SDK Path', defaultsTo: null);
 
+/// The `test/codegen` directory.
+final codegenDir = path.join(testDirectory, 'codegen');
+
+/// The generated directory where tests, expanded multitests, and other test
+/// support libraries are copied to.
+///
+/// The tests sometimes import utility libraries using a relative path.
+/// Likewise, the multitests do too, and one multitest even imports its own
+/// non-expanded form (!). To make that simpler, we copy the entire test tree
+/// to a generated directory and expand that multitests in there too.
+final codegenTestDir = path.join(repoDirectory, 'gen', 'codegen_tests');
+
+/// The generated directory where tests and packages compiled to JS are
+/// output.
+final codegenOutputDir = path.join(repoDirectory, 'gen', 'codegen_output');
+
+// TODO(jmesserly): switch this to a .packages file.
+final packageUrlMappings = {
+  'package:expect/expect.dart': path.join(codegenDir, 'expect.dart'),
+  'package:async_helper/async_helper.dart':
+      path.join(codegenDir, 'async_helper.dart'),
+  'package:js/js.dart': path.join(codegenDir, 'packages', 'js', 'js.dart')
+};
+
+final codeCoverage = Platform.environment.containsKey('COVERALLS_TOKEN');
+
 main(arguments) {
   if (arguments == null) arguments = [];
   ArgResults args = argParser.parse(arguments);
   var filePattern = new RegExp(args.rest.length > 0 ? args.rest[0] : '.');
 
-  var expectDir = path.join(inputDir, 'expect');
+  var sdkDir = path.join(repoDirectory, 'gen', 'patched_sdk');
+  var sdkSummaryFile =
+      path.join(testDirectory, '..', 'lib', 'runtime', 'dart_sdk.sum');
+  var analyzerOptions = new AnalyzerOptions(
+      customUrlMappings: packageUrlMappings,
+      dartSdkSummaryPath: sdkSummaryFile);
+  var compiler = new ModuleCompiler(analyzerOptions);
+
+  // Build packages tests depend on.
+  _buildAllPackages(compiler);
+
   var testDirs = [
     'language',
     'corelib',
@@ -47,105 +88,60 @@ main(arguments) {
     path.join('lib', 'typed_data')
   ];
 
-  var multitests = expandMultiTests(testDirs, filePattern);
+  // Copy all of the test files and expanded multitest files to
+  // gen/codegen_tests. We'll compile from there.
+  var testFiles = _setUpTests(testDirs, filePattern);
 
-  // Build packages tests depend on
-  var sdkSummaryFile =
-      path.join(testDirectory, '..', 'lib', 'runtime', 'dart_sdk.sum');
-  var analyzerOptions = new AnalyzerOptions(
-      customUrlMappings: packageUrlMappings,
-      dartSdkSummaryPath: sdkSummaryFile);
-  var compiler = new ModuleCompiler(analyzerOptions);
+  // Our default compiler options. Individual tests can override these.
+  var defaultOptions = ['--no-source-map', '--no-summarize'];
+  var compilerArgParser = CompilerOptions.addArguments(new ArgParser());
 
-  group('dartdevc package', () {
-    _buildPackages(compiler, expectDir);
+  // Compile each test file to JS and put the result in gen/codegen_output.
+  for (var testFile in testFiles) {
+    var relativePath = path.relative(testFile, from: codegenTestDir);
 
-    test('matcher', () {
-      _buildPackage(compiler, expectDir, "matcher");
-    });
+    // Only compile the top-level files for generating coverage.
+    if (codeCoverage && path.dirname(relativePath) != ".") continue;
 
-    test('unittest', () {
-      // Only build files applicable to the web - html_*.dart and its
-      // internal dependences.
-      _buildPackage(compiler, expectDir, "unittest", packageFiles: [
-        'unittest.dart',
-        'html_config.dart',
-        'html_individual_config.dart',
-        'html_enhanced_config.dart'
-      ]);
-    });
+    var name = path.withoutExtension(relativePath);
+    test('dartdevc $name', () {
+      var outDir = path.join(codegenOutputDir, path.dirname(relativePath));
+      _ensureDirectory(outDir);
 
-    test('stack_trace', () {
-      _buildPackage(compiler, expectDir, "stack_trace");
-    });
+      // Check if we need to use special compile options.
+      var contents = new File(testFile).readAsStringSync();
+      var match =
+          new RegExp(r'// compile options: (.*)').matchAsPrefix(contents);
 
-    test('path', () {
-      _buildPackage(compiler, expectDir, "path");
-    });
-  });
-
-  test('dartdevc sunflower', () {
-    _buildSunflower(compiler, expectDir);
-  });
-
-  // Our default compiler options. Individual tests can override these.
-  var defaultOptions = ['--no-source-map', '--no-summarize'];
-  var compilerArgParser = CompilerOptions.addArguments(new ArgParser());
-
-  var allDirs = [null];
-  allDirs.addAll(testDirs);
-  for (var dir in allDirs) {
-    if (codeCoverage && dir != null) continue;
-
-    group('dartdevc ' + path.join('test', 'codegen', dir), () {
-      var outDir = new Directory(path.join(expectDir, dir));
-      if (!outDir.existsSync()) outDir.createSync(recursive: true);
-
-      var baseDir = path.join(inputDir, dir);
-      var testFiles = _findTests(baseDir, filePattern);
-      for (var filePath in testFiles) {
-        if (multitests.contains(filePath)) continue;
-
-        var filename = path.basenameWithoutExtension(filePath);
-
-        test('$filename.dart', () {
-          // Check if we need to use special compile options.
-          var contents = new File(filePath).readAsStringSync();
-          var match =
-              new RegExp(r'// compile options: (.*)').matchAsPrefix(contents);
-
-          var args = new List.from(defaultOptions);
-          if (match != null) {
-            args.addAll(match.group(1).split(' '));
-          }
-          var options =
-              new CompilerOptions.fromArguments(compilerArgParser.parse(args));
-
-          // Collect any other files we've imported.
-          var files = new Set<String>();
-          _collectTransitiveImports(contents, files, from: filePath);
-          var moduleName =
-              path.withoutExtension(path.relative(filePath, from: inputDir));
-          var unit = new BuildUnit(
-              moduleName, baseDir, files.toList(), _moduleForLibrary);
-          var module = compiler.compile(unit, options);
-          _writeModule(path.join(outDir.path, filename), module);
-        });
+      var args = defaultOptions.toList();
+      if (match != null) {
+        args.addAll(match.group(1).split(' '));
       }
+      var options =
+          new CompilerOptions.fromArguments(compilerArgParser.parse(args));
+
+      // Collect any other files we've imported.
+      var files = new Set<String>();
+      _collectTransitiveImports(contents, files, from: testFile);
+      var moduleName =
+          path.withoutExtension(path.relative(testFile, from: codegenTestDir));
+      var unit = new BuildUnit(moduleName, path.dirname(testFile),
+          files.toList(), _moduleForLibrary);
+      var module = compiler.compile(unit, options);
+      _writeModule(
+          path.join(outDir, path.basenameWithoutExtension(testFile)), module);
     });
   }
 
   if (codeCoverage) {
     test('build_sdk code coverage', () {
-      var generatedSdkDir =
-          path.join(testDirectory, '..', 'tool', 'generated_sdk');
-      return build_sdk.main(['--dart-sdk', generatedSdkDir, '-o', expectDir]);
+      return build_sdk.main(['--dart-sdk', sdkDir, '-o', codegenOutputDir]);
     });
   }
 }
 
 void _writeModule(String outPath, JSModuleFile result) {
-  new Directory(path.dirname(outPath)).createSync(recursive: true);
+  _ensureDirectory(path.dirname(outPath));
 
   String errors = result.errors.join('\n');
   if (errors.isNotEmpty && !errors.endsWith('\n')) errors += '\n';
@@ -177,8 +173,36 @@ void _writeModule(String outPath, JSModuleFile result) {
   }
 }
 
-void _buildSunflower(ModuleCompiler compiler, String expectDir) {
-  var baseDir = path.join(inputDir, 'sunflower');
+void _buildAllPackages(ModuleCompiler compiler) {
+  group('dartdevc package', () {
+    _buildPackages(compiler, codegenOutputDir);
+
+    var packages = ['matcher', 'path', 'stack_trace'];
+    for (var package in packages) {
+      test(package, () {
+        _buildPackage(compiler, codegenOutputDir, package);
+      });
+    }
+
+    test('unittest', () {
+      // Only build files applicable to the web - html_*.dart and its
+      // internal dependences.
+      _buildPackage(compiler, codegenOutputDir, "unittest", packageFiles: [
+        'unittest.dart',
+        'html_config.dart',
+        'html_individual_config.dart',
+        'html_enhanced_config.dart'
+      ]);
+    });
+  });
+
+  test('dartdevc sunflower', () {
+    _buildSunflower(compiler, codegenOutputDir);
+  });
+}
+
+void _buildSunflower(ModuleCompiler compiler, String outputDir) {
+  var baseDir = path.join(codegenDir, 'sunflower');
   var files = ['sunflower', 'circle', 'painter']
       .map((f) => path.join(baseDir, '$f.dart'))
       .toList();
@@ -186,10 +210,10 @@ void _buildSunflower(ModuleCompiler compiler, String expectDir) {
   var options = new CompilerOptions(summarizeApi: false);
 
   var built = compiler.compile(input, options);
-  _writeModule(path.join(expectDir, 'sunflower', 'sunflower'), built);
+  _writeModule(path.join(outputDir, 'sunflower', 'sunflower'), built);
 }
 
-void _buildPackages(ModuleCompiler compiler, String expectDir) {
+void _buildPackages(ModuleCompiler compiler, String outputDir) {
   // Note: we don't summarize these, as we're going to rely on our in-memory
   // shared analysis context for caching, and `_moduleForLibrary` below
   // understands these are from other modules.
@@ -200,33 +224,33 @@ void _buildPackages(ModuleCompiler compiler, String expectDir) {
     var uriPath = uri.substring('package:'.length);
     var name = path.basenameWithoutExtension(uriPath);
     test(name, () {
-      var input = new BuildUnit(name, inputDir, [uri], _moduleForLibrary);
+      var input = new BuildUnit(name, codegenDir, [uri], _moduleForLibrary);
       var built = compiler.compile(input, options);
 
-      var outPath = path.join(expectDir, path.withoutExtension(uriPath));
+      var outPath = path.join(outputDir, path.withoutExtension(uriPath));
       _writeModule(outPath, built);
     });
   }
 }
 
-void _buildPackage(ModuleCompiler compiler, String expectDir, packageName,
+void _buildPackage(ModuleCompiler compiler, String outputDir, packageName,
     {List<String> packageFiles}) {
   var options = new CompilerOptions(sourceMap: false, summarizeApi: false);
 
-  var packageRoot = path.join(inputDir, 'packages');
+  var packageRoot = path.join(codegenDir, 'packages');
   var packageInputDir = path.join(packageRoot, packageName);
   List<String> files;
   if (packageFiles != null) {
-    // Only collect files transitively reachable from packageFiles
+    // Only collect files transitively reachable from packageFiles.
     var reachable = new Set<String>();
-    for (var f in packageFiles) {
-      f = path.join(packageInputDir, f);
-      _collectTransitiveImports(new File(f).readAsStringSync(), reachable,
-          packageRoot: packageRoot, from: f);
+    for (var file in packageFiles) {
+      file = path.join(packageInputDir, file);
+      _collectTransitiveImports(new File(file).readAsStringSync(), reachable,
+          packageRoot: packageRoot, from: file);
     }
     files = reachable.toList();
   } else {
-    // Collect all files in the packages directory
+    // Collect all files in the packages directory.
     files = new Directory(packageInputDir)
         .listSync(recursive: true)
         .where((entry) => entry.path.endsWith('.dart'))
@@ -238,7 +262,7 @@ void _buildPackage(ModuleCompiler compiler, String expectDir, packageName,
       new BuildUnit(packageName, packageInputDir, files, _moduleForLibrary);
   var module = compiler.compile(unit, options);
 
-  var outPath = path.join(expectDir, packageName, packageName);
+  var outPath = path.join(outputDir, packageName, packageName);
   _writeModule(outPath, module);
 }
 
@@ -250,62 +274,79 @@ String _moduleForLibrary(Source source) {
   throw new Exception('Module not found for library "${source.fullName}"');
 }
 
-/// Expands wacky multitests into a bunch of test files.
-///
-/// We'll compile each one as if it was an input.
-/// NOTE: this will write the individual test files to disk.
-Set<String> expandMultiTests(List testDirs, RegExp filePattern) {
-  var multitests = new Set<String>();
+List<String> _setUpTests(List<String> testDirs, RegExp filePattern) {
+  var testFiles = [];
 
   for (var testDir in testDirs) {
-    var fullDir = path.join(inputDir, testDir);
-    var testFiles = _findTests(fullDir, filePattern);
-
-    for (var filePath in testFiles) {
-      if (filePath.endsWith('_multi.dart')) continue;
-
-      var contents = new File(filePath).readAsStringSync();
-      if (isMultiTest(contents)) {
-        multitests.add(filePath);
+    for (var file in _listFiles(path.join(codegenDir, testDir), filePattern,
+        recursive: true)) {
+      var relativePath = path.relative(file, from: codegenDir);
+      var outputPath = path.join(codegenTestDir, relativePath);
+
+      _ensureDirectory(path.dirname(outputPath));
+
+      // Copy it over. We do this even for multitests because import_self_test
+      // is a multitest, yet imports its own unexpanded form (!).
+      new File(file).copySync(outputPath);
+
+      if (file.endsWith("_test.dart")) {
+        var contents = new File(file).readAsStringSync();
+
+        if (isMultiTest(contents)) {
+          // It's a multitest, so expand it and add all of the variants.
+          var tests = <String, String>{};
+          var outcomes = <String, Set<String>>{};
+          extractTestsFromMultitest(file, contents, tests, outcomes);
+
+          var fileName = path.basenameWithoutExtension(file);
+          var outputDir = path.dirname(outputPath);
+          tests.forEach((name, contents) {
+            var multiFile =
+                path.join(outputDir, '${fileName}_${name}_multi.dart');
+            testFiles.add(multiFile);
+
+            new File(multiFile).writeAsStringSync(contents);
+          });
+        } else {
+          // It's a single test suite.
+          testFiles.add(outputPath);
+        }
+      }
+    }
+  }
 
-        var tests = new Map<String, String>();
-        var outcomes = new Map<String, Set<String>>();
-        extractTestsFromMultitest(filePath, contents, tests, outcomes);
+  // Also include the other special files that live at the top level directory.
+  for (var file in _listFiles(codegenDir, filePattern)) {
+    var relativePath = path.relative(file, from: codegenDir);
+    var outputPath = path.join(codegenTestDir, relativePath);
 
-        var filename = path.basenameWithoutExtension(filePath);
-        tests.forEach((name, contents) {
-          new File(path.join(fullDir, '${filename}_${name}_multi.dart'))
-              .writeAsStringSync(contents);
-        });
-      }
+    new File(file).copySync(outputPath);
+    if (file.endsWith(".dart")) {
+      testFiles.add(outputPath);
     }
   }
-  return multitests;
+
+  return testFiles;
 }
 
-// TODO(jmesserly): switch this to a .packages file.
-final packageUrlMappings = {
-  'package:expect/expect.dart': path.join(inputDir, 'expect.dart'),
-  'package:async_helper/async_helper.dart':
-      path.join(inputDir, 'async_helper.dart'),
-  'package:js/js.dart': path.join(inputDir, 'packages', 'js', 'js.dart')
-};
+/// Recursively creates [dir] if it doesn't exist.
+void _ensureDirectory(String dir) {
+  new Directory(dir).createSync(recursive: true);
+}
 
-final codeCoverage = Platform.environment.containsKey('COVERALLS_TOKEN');
+/// Lists all of the files within [dir] that match [filePattern].
+Iterable<String> _listFiles(String dir, RegExp filePattern,
+    {bool recursive: false}) {
+  return new Directory(dir)
+      .listSync(recursive: recursive, followLinks: false)
+      .where((entry) {
+    if (entry is! File) return false;
 
-final inputDir = path.join(testDirectory, 'codegen');
-
-Iterable<String> _findTests(String dir, RegExp filePattern) {
-  var files = new Directory(dir)
-      .listSync()
-      .where((f) => f is File)
-      .map((f) => f.path)
-      .where((p) => p.endsWith('.dart') && filePattern.hasMatch(p));
-  if (dir != inputDir) {
-    files = files
-        .where((p) => p.endsWith('_test.dart') || p.endsWith('_multi.dart'));
-  }
-  return files;
+    var filePath = entry.path;
+    if (!filePattern.hasMatch(filePath)) return false;
+
+    return true;
+  }).map((file) => file.path);
 }
 
 /// Parse directives from [contents] and find the complete set of transitive