Add test for native extensions that copies the extension to a test directory and runs it.

tests/standalone/io/test_extension_test.dart

 // 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.
+//
+// Dart test program for testing native extensions.
 
-#library("test_extension_test");
+#import("dart:io");
+#import("dart:isolate");
 
-#import('test_extension.dart');
+// The following import statements, hidden in a string, fool the test script

[Søren Gjesse, 2012/06/29 12:32:11]

import -> source

+// tools/testing/dart/multitest.dart
+// into copying the files into the generated_tests directory.
+final dummyString = '''
+#source('test_extension_tester.dart');
+#source('test_extension.dart');
+''';
 
-main() {
-  Expect.equals('cat 13', new Cat(13).toString(), 'new Cat(13).toString()');
+void main() {
+  Options options = new Options();
 
-  Expect.equals(3, Cat.ifNull(null, 3), 'Cat.ifNull(null, 3)');
-  Expect.equals(4, Cat.ifNull(4, null), 'Cat.ifNull(4, null)');
-  Expect.equals(5, Cat.ifNull(5, 9), 'Cat.ifNull(5, 9)');
-  Expect.isNull(Cat.ifNull(null, null), 'Cat.ifNull(null, null)');
+  // Make this a multitest so that the test scripts run a copy of it in

[Søren Gjesse, 2012/06/29 12:32:11]

I am not sure that I like the way you get this file, test_extension_tester.dart
and test_extension.dart copied into the generated_tests directory.

It is a way to get it running, but at least you should open a bug saying that
this should be reconsidered and there should be another way to do this.

As you are already copying the native extension file couldn't you also just copy
the other files as well into some well known directory?

[Bill Hesse, 2012/06/29 12:46:32]

You are write - if this is not a multitest, then we will know both the build
directory and the dart directory, and so we can copy all of the files manually. 
I will file a bug to redo this that way.

On 2012/06/29 12:32:11, Søren Gjesse wrote:

+  // [build directory]/generated_tests.  This way, we can copy the shared
+  // library for test_extension.dart to the test directory.
+  // The "none" case of the multitest, without the following
+  // line, is the one that runs the test of the extension.
+  foo foo foo foo foo; /// 01: compile-time error
+
+  Path testDirectory = new Path.fromNative(options.script).directoryPath;
+  Path buildDirectory = new Path.fromNative(options.executable).directoryPath;
+
+  // Copy test_extension shared library from the build directory to the
+  // test directory.
+  Future sharedLibraryCopied;
+  // Use the platforms' copy file commands, to preserve executable privilege.
+  switch (Platform.operatingSystem) {
+    case 'linux':
+      var source = buildDirectory.append('lib.target/libtest_extension.so');
+      sharedLibraryCopied = Process.run('cp',
+                               [source.toNativePath(),
+                                testDirectory.toNativePath()]);
+      break;
+    case 'macos':
+      var source = buildDirectory.append('libtest_extension.dylib');
+      sharedLibraryCopied = Process.run('cp',
+                               [source.toNativePath(),
+                                testDirectory.toNativePath()]);
+      break;
+    case 'windows':
+      var source = buildDirectory.append('test_extension.dll');
+      sharedLibraryCopied = Process.run('cmd.exe',
+          ['/C',
+           'copy ${source.toNativePath()} ${testDirectory.toNativePath()}']);
+      break;
+    default:
+      Expect.fail("Unknown operating system ${Platform.operatingSystem}");
+  }
+
+  sharedLibraryCopied.handleException((e) {
+    print('Copying of shared library test_extension failed.');
+    throw e;
+  });
+  sharedLibraryCopied.then((ignore) {
+    print('Shared library copied to test directory.');
+    Path copiedTest = testDirectory.append("test_extension_tester.dart");
+    var result = Process.run(options.executable,
+                             [copiedTest.toNativePath()]);
+    result.then((processResult) {
+      print('Output of test_extension_tester.dart:');
+      print('  stdout:');
+      print(processResult.stdout);
+      print('  stderr:');
+      print(processResult.stderr);
+      stdout.flush();
+      exit(processResult.exitCode);
+    });
+  });
 }