Added support for skipping redundant dart2js compilations.

tests/standalone/io/test_skipping_dart2js_compilations.dart

Index: tests/standalone/io/test_skipping_dart2js_compilations.dart
diff --git a/tests/standalone/io/test_skipping_dart2js_compilations.dart b/tests/standalone/io/test_skipping_dart2js_compilations.dart
new file mode 100644
index 0000000000000000000000000000000000000000..97392371918e517bcd7321cdd7f76802af248971
--- /dev/null
+++ b/tests/standalone/io/test_skipping_dart2js_compilations.dart
@@ -0,0 +1,175 @@
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+#import("dart:io");
+#import("dart:isolate");
+#import("dart:uri");
+#import("../../../tools/testing/dart/test_suite.dart");
+#import("../../../tools/testing/dart/test_runner.dart");
+#import("../../../tools/testing/dart/test_options.dart");
+#import("../../../tools/testing/dart/status_file_parser.dart");
+
+class FsUtils {
+  Directory tempDir;
+  File testJs;
+  File testJsDeps;
+  File testDart;
+  File testSnapshot;
+
+  FsUtils(bool createJs, bool createJsDeps, bool createDart,
+        bool createSnapshot) {
+    tempDir = new Directory('').createTempSync();
+    if (createJs) {
+      testJs = _createFile(testJsFilePath);
+      _writeToFile(testJs, "test.js content");
+    }
+    if (createSnapshot) {
+      testSnapshot = _createFile(testSnapshotFilePath);
+      _writeToFile(testSnapshot, "dart2js snapshot");
+    }
+    if (createDart) {
+      testDart = _createFile(testDartFilePath);
+      _writeToFile(testDart, "dart code");
+    }
+    if (createJsDeps) {
+      testJsDeps = _createFile(testJsDepsFilePath);
+      var path = TestUtils.absolutePath(new Path.fromNative(tempDir.path))
+          .append("test.dart");
+      _writeToFile(testJsDeps, "file://$path");
+    }
+  }
+
+  void cleanup() {
+    if (testJs != null) testJs.deleteSync();
+    if (testJsDeps != null) testJsDeps.deleteSync();
+    if (testDart != null) testDart.deleteSync();
+    if (testSnapshot != null) testSnapshot.deleteSync();
+
+    // if the script did run, it created this file, so we need to delete it
+    File file = new File.fromPath(scriptOutputPath);
+    if (file.existsSync()) {
+      file.deleteSync();
+    }
+
+    tempDir.deleteSync();
+  }
+
+  Path get scriptOutputPath {
+    return TestUtils.absolutePath(new Path.fromNative(tempDir.path)
+        .append('created_if_command_did_run.txt'));
+  }
+
+  Path get testDartFilePath {
+    return TestUtils.absolutePath(new Path.fromNative(tempDir.path)
+        .append('test.dart'));
+  }
+
+  Path get testJsFilePath {
+    return TestUtils.absolutePath(new Path.fromNative(tempDir.path)
+        .append('test.js'));
+  }
+
+  Path get testJsDepsFilePath {
+    return TestUtils.absolutePath(new Path.fromNative(tempDir.path)
+        .append('test.js.deps'));
+  }
+
+  Path get testSnapshotFilePath {
+    return TestUtils.absolutePath(new Path.fromNative(tempDir.path)
+        .append('test_dart2js.snapshot'));
+  }
+
+  void touchFile(File file) {
+    _writeToFile(file, _readFile(file));
+  }
+
+  void _writeToFile(File file, String content) {
+    if (content != null) {
+      var fd = new File(file.fullPathSync()).openSync(FileMode.WRITE);
+      fd.writeStringSync(content);
+      fd.closeSync();
+    }
+  }
+
+  String _readFile(File file) {
+    return file.readAsTextSync();
+  }
+
+  File _createFile(Path path) {
+    var file = new File.fromPath(path);
+    file.createSync();
+    return file;
+  }
+}
+
+class TestCompletedHandler {
+  FsUtils fsUtils;
+  Date _expectedTimestamp;
+  bool _shouldHaveRun;
+  
+  TestCompletedHandler(FsUtils this.fsUtils, bool this._shouldHaveRun);
+  
+  void processCompletedTest(TestCase testCase) {
+    TestOutput output = testCase.output;
+
+    Expect.isFalse(output.unexpectedOutput);
+    Expect.isTrue(output.stderr.length == 0);
+    if (_shouldHaveRun) {
+      Expect.isTrue(output.stdout.length == 0);
+      Expect.isTrue(new File.fromPath(fsUtils.scriptOutputPath).existsSync());
+    } else {
+      Expect.isFalse(new File.fromPath(fsUtils.scriptOutputPath).existsSync());
+    }
+    fsUtils.cleanup();
+  }
+}
+
+TestCase MakeTestCase(String testName, TestCompletedHandler completedHandler) {
+  var fsUtils = completedHandler.fsUtils;
+  var config = new TestOptionsParser().parse(['--timeout', '2'])[0];
+  var scriptDirPath = new Path.fromNative(new Options().script).directoryPath;
+  var createFileScript = scriptDirPath.
+      append('test_skipping_dart2js_compilation__helper.dart').toNativePath();
+  var executable = new Options().executable;
+  var arguments = [createFileScript, fsUtils.scriptOutputPath.toNativePath()];
+  var bootstrapDeps = [
+      new Uri("file://${fsUtils.testSnapshotFilePath}")];
+  var commands = [new Dart2JsCommand(fsUtils.testJsFilePath.toNativePath(), 
+      false, bootstrapDeps, executable, arguments)];
+  return new TestCase(testName, commands, config, 
+      completedHandler.processCompletedTest, new Set<String>.from([PASS]));
+}
+
+void main() {  
+  var fs_noTestJs = new FsUtils(false, true, true, true);
+  var fs_noTestJsDeps = new FsUtils(true, false, true, true);
+  var fs_noTestDart = new FsUtils(true, true, false, true);
+  var fs_noTestSnapshot = new FsUtils(true, true, true, false);
+  var fs_notUpToDate_snapshot = new FsUtils(true, true, true, true);
+  var fs_notUpToDate_dart = new FsUtils(true, true, true, true);
+  var fs_upToDate = new FsUtils(true, true, true, true);
+
+  void touchFilesAndRunTests(Timer unused) {
+    fs_notUpToDate_snapshot.touchFile(fs_notUpToDate_snapshot.testSnapshot);
+    fs_notUpToDate_dart.touchFile(fs_notUpToDate_dart.testDart);
+    fs_upToDate.touchFile(fs_upToDate.testJs);
+
+    void runTest(String name, FsUtils fsUtils, bool shouldRun) {
+      new RunningProcess(MakeTestCase(name, 
+          new TestCompletedHandler(fsUtils, shouldRun))).start();
+    }
+    runTest("fs_noTestJs", fs_noTestJs, true);
+    runTest("fs_noTestJsDeps", fs_noTestJsDeps, true);
+    runTest("fs_noTestDart", fs_noTestDart, true);
+    runTest("fs_noTestSnapshot", fs_noTestSnapshot, true);
+    runTest("fs_notUpToDate_snapshot", fs_notUpToDate_snapshot, true);
+    runTest("fs_notUpToDate_dart", fs_notUpToDate_dart, true);
+    // This is the only test where all dependencies are present and the test.js
+    // file is newer than all the others. So we pass 'false' for shouldRun.
+    runTest("fs_upToDate", fs_upToDate, false);
+  }
+  // We need to wait some time to make sure that the files we 'touch' get a 
+  // bigger timestamp than the old ones
+  new Timer(1000, touchFilesAndRunTests);
+}