Fix for PartDirective annotations while applying resynthesized element model.

pkg/analyzer/test/generated/declaration_resolver_test.dart

Index: pkg/analyzer/test/generated/declaration_resolver_test.dart
diff --git a/pkg/analyzer/test/generated/declaration_resolver_test.dart b/pkg/analyzer/test/generated/declaration_resolver_test.dart
index 9ecac6a32d3a4e5af95ec82243f4e9f31e5568d0..3f7071f5c65f8e55fad8454bb6d381d141b736e2 100644
--- a/pkg/analyzer/test/generated/declaration_resolver_test.dart
+++ b/pkg/analyzer/test/generated/declaration_resolver_test.dart
@@ -219,6 +219,38 @@ const b = null;
     expect(unit.directives[1].metadata.single.name.name, 'b');
   }
 
+  solo_test_metadata_partDirective_resynthesized() async {

[Brian Wilkerson, 2017/01/31 19:40:07]

Remove "solo_".

+    addNamedSource('/part_a.dart', 'part of L;');
+    addNamedSource('/part_b.dart', 'part of L;');
+
+    CompilationUnit unit = await resolveSource(r'''
+library L;
+
+@a
+part "part_a.dart";
+
+@b
+part "part_b.dart";
+
+const a = null;
+const b = null;
+''');
+    expect(unit.directives[1].metadata.single.name.name, 'a');
+    expect(unit.directives[2].metadata.single.name.name, 'b');
+    var unitElement = unit.element as CompilationUnitElementImpl;
+    // Damage the unit element - as if "setAnnotations" were not called.
+    // The ImportElement(s) still have the metadata, we should use it.
+    unitElement.setAnnotations(unit.directives[1].offset, []);
+    unitElement.setAnnotations(unit.directives[2].offset, []);
+    expect(unitElement.library.parts[0].metadata, hasLength(1));
+    expect(unitElement.library.parts[1].metadata, hasLength(1));
+    // DeclarationResolver on the clone should succeed.
+    CompilationUnit clonedUnit = AstCloner.clone(unit);
+    new DeclarationResolver().resolve(clonedUnit, unit.element);
+    expect(unit.directives[1].metadata.single.name.name, 'a');
+    expect(unit.directives[2].metadata.single.name.name, 'b');
+  }
+
   test_metadata_libraryDirective() async {
     await setupCode('@a library L;');
     checkMetadata('L');