Improve cache entry tests

pkg/analyzer/lib/src/generated/engine.dart

Index: pkg/analyzer/lib/src/generated/engine.dart
diff --git a/pkg/analyzer/lib/src/generated/engine.dart b/pkg/analyzer/lib/src/generated/engine.dart
index 4de74d42835d8113ecce5899cd29038c5b5262ea..66ef5e8f3ece44b8c553d261b04175f39076f52a 100644
--- a/pkg/analyzer/lib/src/generated/engine.dart
+++ b/pkg/analyzer/lib/src/generated/engine.dart
@@ -8519,7 +8519,8 @@ class DartEntry extends SourceEntry {
    * relative to a library.
    */
   bool _isValidLibraryDescriptor(DataDescriptor descriptor) {
-    return descriptor == BUILT_ELEMENT
+    return descriptor == ANGULAR_ERRORS
+        || descriptor == BUILT_ELEMENT
         || descriptor == BUILT_UNIT
         || descriptor == HINTS
         || descriptor == RESOLUTION_ERRORS
@@ -11988,6 +11989,7 @@ class ResolutionState {
     setState(DartEntry.RESOLVED_UNIT, CacheState.ERROR);
     setState(DartEntry.RESOLUTION_ERRORS, CacheState.ERROR);
     recordVerificationError();
+    setState(DartEntry.ANGULAR_ERRORS, CacheState.ERROR);
   }
 
   /**