Add Fasta tests.

pkg/fasta/test/default_values.dart.direct.expect

Index: pkg/fasta/test/default_values.dart.direct.expect
diff --git a/pkg/fasta/test/default_values.dart.direct.expect b/pkg/fasta/test/default_values.dart.direct.expect
new file mode 100644
index 0000000000000000000000000000000000000000..6e1163b931ce4c712659ff18b2014a364b4ed8e5
--- /dev/null
+++ b/pkg/fasta/test/default_values.dart.direct.expect
@@ -0,0 +1,9 @@
+library;
+import self as self;
+import "dart:core" as core;
+
+static method topLevel([dynamic a = 42]) → dynamic
+  return a;
+static method main() → dynamic {
+  core::print(self::topLevel(42));
+}