Use FlushTargetFilter to pre-filter targets before checking their results.

pkg/analyzer/test/src/context/cache_test.dart

 // Copyright (c) 2015, 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 analyzer.test.src.context.cache_test;
 
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/file_system/physical_file_system.dart';
 import 'package:analyzer/source/package_map_resolver.dart';
@@ skipping 52 matching lines @@
     CacheEntry entry = new CacheEntry(target);
     cache.put(entry);
     // put values
     entry.setValue(resultA, 'a', TargetedResult.EMPTY_LIST);
     entry.setValue(resultB, 'b', TargetedResult.EMPTY_LIST);
     expect(cache.getState(target, resultA), CacheState.VALID);
     expect(cache.getState(target, resultB), CacheState.VALID);
     expect(cache.getValue(target, resultA), 'a');
     expect(cache.getValue(target, resultB), 'b');
     // flush A
-    cache.flush((target, result) => result == resultA);
+    cache.flush((target) => true, (target, result) => result == resultA);
     expect(cache.getState(target, resultA), CacheState.FLUSHED);
     expect(cache.getState(target, resultB), CacheState.VALID);
     expect(cache.getValue(target, resultA), isNull);
     expect(cache.getValue(target, resultB), 'b');
   }
 
   void test_get() {
     AnalysisTarget target = new TestSource();
     expect(cache.get(target), isNull);
   }
@@ skipping 245 matching lines @@
     CacheEntry entry = new CacheEntry(target);
     cache.put(entry);
     // put values
     entry.setValue(resultA, 'a', TargetedResult.EMPTY_LIST);
     entry.setValue(resultB, 'b', TargetedResult.EMPTY_LIST);
     expect(entry.getState(resultA), CacheState.VALID);
     expect(entry.getState(resultB), CacheState.VALID);
     expect(entry.getValue(resultA), 'a');
     expect(entry.getValue(resultB), 'b');
     // flush A
-    entry.flush((target, result) => result == resultA);
+    entry.flush((target) => true, (target, result) => result == resultA);
     expect(entry.getState(resultA), CacheState.FLUSHED);
     expect(entry.getState(resultB), CacheState.VALID);
     expect(entry.getValue(resultA), isNull);
     expect(entry.getValue(resultB), 'b');
   }
 
   test_getState() {
     AnalysisTarget target = new TestSource();
     ResultDescriptor result = new ResultDescriptor('test', null);
     CacheEntry entry = new CacheEntry(target);
@@ skipping 912 matching lines @@
   }
 }
 
 class _TestAnalysisTarget implements AnalysisTarget {
   @override
   Source get librarySource => null;
 
   @override
   Source get source => null;
 }