improve import uri completions - fixes #24000

pkg/analysis_server/test/abstract_context.dart

Index: pkg/analysis_server/test/abstract_context.dart
diff --git a/pkg/analysis_server/test/abstract_context.dart b/pkg/analysis_server/test/abstract_context.dart
index 696a2ae39e2f9630ecf8c7ef4c37a1313dc0498f..46f0dbf2a027bd5a94111d50925e2e9c2f4aea90 100644
--- a/pkg/analysis_server/test/abstract_context.dart
+++ b/pkg/analysis_server/test/abstract_context.dart
@@ -41,7 +41,7 @@ class AbstractContextTest {
   static final DartSdk SDK = new MockSdk();
   static final UriResolver SDK_RESOLVER = new DartUriResolver(SDK);
 
-  MemoryResourceProvider provider = new MemoryResourceProvider();
+  MemoryResourceProvider provider;
   Map<String, List<Folder>> packageMap;
   UriResolver resourceResolver;
   AnalysisContext context;
@@ -83,6 +83,7 @@ class AbstractContextTest {
   }
 
   void setUp() {
+    setupResourceProvider();
     resourceResolver = new ResourceUriResolver(provider);
     packageMap = new Map<String, List<Folder>>();
     PackageMapUriResolver packageResolver =
@@ -92,6 +93,10 @@ class AbstractContextTest {
         new SourceFactory([SDK_RESOLVER, packageResolver, resourceResolver]);
   }
 
+  void setupResourceProvider() {
+    provider = new MemoryResourceProvider();
+  }
+
   void tearDown() {
     context = null;
     provider = null;