Parameterize the import directories, fix test to behave correctly on an error

pkg/intl/test/message_extraction/message_extraction_test.dart

Index: pkg/intl/test/message_extraction/message_extraction_test.dart
diff --git a/pkg/intl/test/message_extraction/message_extraction_test.dart b/pkg/intl/test/message_extraction/message_extraction_test.dart
index 0b00fdb99f8a8fb3d6137a3686ee3f7ae815eb6b..9b4e3520e19bc95f00ec2bed37bb73b9abc41f7c 100644
--- a/pkg/intl/test/message_extraction/message_extraction_test.dart
+++ b/pkg/intl/test/message_extraction/message_extraction_test.dart
@@ -55,16 +55,20 @@ main() {
   test("Test round trip message extraction, translation, code generation, "
       "and printing", () {
     deleteGeneratedFiles();
-    extractMessages(null).then((result) {

[Emily Fortuna, 2013/03/19 20:31:37]

if you just add a return statement at this line:
return extractMessage(null)..... 

you should get what you're looking for.

[Alan Knight, 2013/03/19 20:53:46]

Done.

-      return generateTranslationFiles(result);
-    }).then((result) {
-      return generateCodeFromTranslation(result);
-    }).then((result) {
-      return runGeneratedCode(result);
-    }).then(verifyResult);
+    return runTheTest();
   });
 }
 
+Future runTheTest() {
+  return extractMessages(null).then((result) {
+    return generateTranslationFiles(result);
+  }).then((result) {
+    return generateCodeFromTranslation(result);
+  }).then((result) {
+    return runGeneratedCode(result);
+  }).then(verifyResult);
+}
+
 void deleteGeneratedFiles() {
   var files = [dir('intl_messages.json'), dir('translation_fr.json'),
       dir('messages_fr.dart'), dir('message_de_DE.dart'),
@@ -124,7 +128,7 @@ Future<ProcessResult> generateCodeFromTranslation(ProcessResult previousResult)
 Future<ProcessResult> runGeneratedCode(ProcessResult previousResult) =>
     run(previousResult, ['sample_with_messages.dart']);
 
-void verifyResult(results) {
+verifyResult(results) {
   var lineIterator;
   verify(String s) {
     lineIterator.moveNext();