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

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

Index: pkg/analyzer/test/src/context/cache_test.dart
diff --git a/pkg/analyzer/test/src/context/cache_test.dart b/pkg/analyzer/test/src/context/cache_test.dart
index bc8342a2400ce88725f3da4eae68e3e2ba9bcc4c..1d4bc4f18ece8cb1c5ce71a8c0aa3b197b10794a 100644
--- a/pkg/analyzer/test/src/context/cache_test.dart
+++ b/pkg/analyzer/test/src/context/cache_test.dart
@@ -70,7 +70,7 @@ class AnalysisCacheTest extends AbstractCacheTest {
     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);
@@ -336,7 +336,7 @@ class CacheEntryTest extends AbstractCacheTest {
     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);