TEMPORARY - Validate fix for 16994 with some caveats

tests/standalone/io/platform_executable_test.dart

Index: tests/standalone/io/platform_executable_test.dart
diff --git a/tests/standalone/io/platform_executable_test.dart b/tests/standalone/io/platform_executable_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..c9825060c896b14c5e97c56ca012bbbb1d88a67a
--- /dev/null
+++ b/tests/standalone/io/platform_executable_test.dart
@@ -0,0 +1,147 @@
+// 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.
+//
+// Process test program to test process communication.
+
+library PlatformExecutableTest;
+
+import "dart:io";
+
+void expectEquals(a, b) {
+  if (a != b) {
+    throw 'Expected: $a\n'
+          '  Actual: $b';
+  }
+}
+
+void verify(String exePath, {String altPath}) {
+  var env = {'SCRIPT': 'yes'};
+  if (altPath != null) {
+    env['PATH'] = altPath;
+  }
+
+  var processResult = Process.runSync(exePath, [scriptPath],
+      includeParentEnvironment: false, runInShell: true, environment: env);
+
+  if (processResult.exitCode != 0) {
+    throw 'Error with process\n'
+          '$scriptPath'
+          'Exit code: ${processResult.exitCode}\n'
+          '   STDOUT: ${processResult.stdout}\n'
+          '   STDERR: ${processResult.stderr}\n';
+  }
+
+  var result = processResult.stdout.trim();
+  expectEquals(Platform.executable, result);
+}
+
+void testDartExecShouldNotBeInCurrentDir() {
+  var type = FileSystemEntity.typeSync(platformExeName);
+  expectEquals(FileSystemEntityType.NOT_FOUND, type);
+}
+
+void testShouldFailOutsidePath() {
+  var threw = false;
+  try {
+    Process.runSync(platformExeName, [scriptPath], 
+      includeParentEnvironment: false, environment: {'SCRIPT': 'yes'});
+  } catch (_) {
+    threw = true;
+  }
+
+  expectEquals(true, threw);
+}
+
+void testShouldSucceedWithSourcePlatformExecutable() {
+  //print('*** Running normally');
+  verify(Platform.executable);
+}
+
+void testExeSymLinked(Directory dir) {
+  var dirUri = new Uri.directory(dir.path);
+  var link = new Link.fromUri(dirUri.resolve('dart_exe_link'));
+  link.createSync(Platform.executable);
+  //print('*** Creating a sym-link to the executable');
+  verify(link.path);
+}
+
+void testPathToDirWithExeSymLinked(Directory dir) {
+  var dirUri = new Uri.directory(dir.path);
+  var link = new Link.fromUri(dirUri.resolve('dart_exe_link'));
+  link.createSync(Platform.executable);
+  //print('*** Path to a directory that contains a sym-link to dart bin');
+  verify('dart_exe_link', altPath: dir.path);
+}
+
+/// Create a sym-link to the SDK directory and run 'dart' from that path
+void testExeDirSymLinked(Directory dir) {
+  var dirUri = new Uri.directory(dir.path);
+
+  var linkDirUri = dirUri.resolve('dart_bin_dir_link');
+  var link = new Link.fromUri(linkDirUri);
+
+  var exeFile = new File(Platform.executable);
+
+  link.createSync(exeFile.parent.path);
+
+  var linkedBin =
+      new Uri.directory(linkDirUri.toFilePath()).resolve(platformExeName);
+
+  //print('*** Running in a sym-linked directory');
+  verify(linkedBin.toFilePath());
+}
+
+void testPathPointsToSymLinkedSDKPath(Directory dir) {
+  var dirUri = new Uri.directory(dir.path);
+
+  var linkDirUri = dirUri.resolve('dart_bin_dir_link');
+  var link = new Link.fromUri(linkDirUri);
+
+  var exeFile = new File(Platform.executable);
+
+  link.createSync(exeFile.parent.path);
+
+  //print('*** Path points to a sym-linked SDK dir');
+  verify(platformExeName, altPath: link.path);
+}
+
+void testPathToSDKDir() {
+  var exeFile = new File(Platform.executable);
+  var binDirPath = exeFile.parent.path;
+
+  //print('*** Running with PATH env set to environment - fixed in 16994 - thanks!');
+  verify(platformExeName, altPath: binDirPath);
+}
+
+void withTempDir(void test(Directory dir)) {
+  var tempDir = Directory.systemTemp.createTempSync('dart.sdk.test.');
+  try {
+    test(tempDir);
+  } finally {
+    tempDir.deleteSync(recursive: true);
+  }
+}
+
+String get platformExeName {
+  var raw = new Uri.file(Platform.executable);
+  return raw.pathSegments.last;
+}
+
+String get scriptPath => Platform.script.toString();
+
+void main() {
+  if (Platform.environment.containsKey('SCRIPT')) {
+    print(Platform.executable);
+    return;
+  }
+
+  testDartExecShouldNotBeInCurrentDir();
+  testShouldFailOutsidePath();
+  testShouldSucceedWithSourcePlatformExecutable(); /// 00: ok
+  withTempDir(testExeSymLinked); /// 01: ok
+  withTempDir(testExeDirSymLinked); /// 02: ok
+  testPathToSDKDir(); /// 03: ok
+  withTempDir(testPathPointsToSymLinkedSDKPath); /// 04: ok
+  withTempDir(testPathToDirWithExeSymLinked); /// 05: ok
+}