Get rid of 'close' on process. It is very easy to use incorrectly and cut off data from your stream…

tests/standalone/io/process_working_directory_test.dart

Index: tests/standalone/io/process_working_directory_test.dart
diff --git a/tests/standalone/io/process_working_directory_test.dart b/tests/standalone/io/process_working_directory_test.dart
index 1255518b0b523e9f982302a6c1c8b48347178dce..6040b53ea0e2e7af7a760e89b3864ab59c667060 100644
--- a/tests/standalone/io/process_working_directory_test.dart
+++ b/tests/standalone/io/process_working_directory_test.dart
@@ -27,9 +27,10 @@ class ProcessWorkingDirectoryTest {
     processFuture.then((process) {
       process.onExit = (int exitCode) {
         Expect.equals(exitCode, 99);
-        process.close();
         directory.deleteSync();
       };
+      process.stdout.onData = process.stdout.read;
+      process.stderr.onData = process.stderr.read;
     });
     processFuture.handleException((error) {
       directory.deleteSync();
@@ -48,7 +49,6 @@ class ProcessWorkingDirectoryTest {
                                options);
     future.then((process) {
       Expect.fail("bad process completed");
-      process.close();
       directory.deleteSync();
     });