Add default values for optional parameters. (#27197)
diff --git a/packages/flutter_tools/test/emulator_test.dart b/packages/flutter_tools/test/emulator_test.dart
index 59b276d..7a7c5b4 100644
--- a/packages/flutter_tools/test/emulator_test.dart
+++ b/packages/flutter_tools/test/emulator_test.dart
@@ -203,8 +203,8 @@
Map<String, String> environment,
bool includeParentEnvironment = true,
bool runInShell = false,
- Encoding stdoutEncoding,
- Encoding stderrEncoding
+ Encoding stdoutEncoding = systemEncoding,
+ Encoding stderrEncoding = systemEncoding
}) {
final String program = command[0];
final List<String> args = command.sublist(1);