Add minimal yaml support to the engine

pkg/analyzer/test/src/task/test_all.dart

Index: pkg/analyzer/test/src/task/test_all.dart
diff --git a/pkg/analyzer/test/src/task/test_all.dart b/pkg/analyzer/test/src/task/test_all.dart
index 41e568ee8a4ad4b71dab96eae9e4e9167f7bfd0f..956a8e53b282f64b868d0e0d0d3b3951a59392be 100644
--- a/pkg/analyzer/test/src/task/test_all.dart
+++ b/pkg/analyzer/test/src/task/test_all.dart
@@ -21,6 +21,7 @@ import 'model_test.dart' as model_test;
 import 'options_test.dart' as options_test;
 import 'options_work_manager_test.dart' as options_work_manager_test;
 import 'strong_mode_test.dart' as strong_mode_test;
+import 'yaml_test.dart' as yaml_test;
 
 /// Utility for manually running all tests.
 main() {
@@ -39,5 +40,6 @@ main() {
     options_test.main();
     options_work_manager_test.main();
     strong_mode_test.main();
+    yaml_test.main();
   });
 }