cache suggestions on change in priority sources

pkg/analysis_server/test/services/completion/imported_computer_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library test.services.completion.toplevel;
 
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_server/src/services/completion/completion_manager.dart';
 import 'package:analysis_server/src/services/completion/dart_completion_cache.dart';
 import 'package:analysis_server/src/services/completion/dart_completion_manager.dart';
@@ skipping 21 matching lines @@
       fail('expected $completion to be cached');
     }
   }
 
   /**
    * Assert that the ImportedComputer uses cached results to produce identical
    * suggestions to the original set of suggestions.
    */
   @override
   void assertCachedCompute(_) {
+    if (!(computer as ImportedComputer).shouldWaitForLowPrioritySuggestions) {
+      return;
+    }
     expect(request.unit.element, isNotNull);
     List<CompletionSuggestion> oldSuggestions = request.suggestions;
     /*
      * Simulate a source change to flush the cached compilation unit
      */
     ChangeSet changes = new ChangeSet();
     changes.addedSource(testSource);
     context.applyChanges(changes);
     /*
      * Calculate a new completion at the same location
@@ skipping 85 matching lines @@
   @override
   test_Block_inherited_imported() {
     return super.test_Block_inherited_imported().then((_) {
       assertCached('E');
       assertCached('F');
       assertNotCached('e1');
       assertNotCached('i2');
       assertNotCached('m1');
     });
   }
+
+  test_Block_partial_results() {
+    // Block  BlockFunctionBody  MethodDeclaration
+    addSource('/testAB.dart', '''
+      export "dart:math" hide max;
+      class A {int x;}
+      @deprecated D1() {int x;}
+      class _B { }''');
+    addSource('/testCD.dart', '''
+      String T1;
+      var _T2;
+      class C { }
+      class D { }''');
+    addSource('/testEEF.dart', '''
+      class EE { }
+      class F { }''');
+    addSource('/testG.dart', 'class G { }');
+    addSource('/testH.dart', '''
+      class H { }
+      int T3;
+      var _T4;'''); // not imported
+    addTestSource('''
+      import "/testAB.dart";
+      import "/testCD.dart" hide D;
+      import "/testEEF.dart" show EE;
+      import "/testG.dart" as g;
+      int T5;
+      var _T6;
+      Z D2() {int x;}
+      class X {a() {var f; {var x;} ^ var r;} void b() { }}
+      class Z { }''');
+    (computer as ImportedComputer).shouldWaitForLowPrioritySuggestions = false;
+    computeFast();
+    return computeFull((bool result) {
+      assertSuggestImportedClass('C');
+      // Assert computer does not wait for or include low priority results
+      // from non-imported libraries unless instructed to do so.
+      assertNotSuggested('H');
+    });
+  }
 }