update completion cache key to include part directives

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

Index: pkg/analysis_server/test/services/completion/imported_computer_test.dart
diff --git a/pkg/analysis_server/test/services/completion/imported_computer_test.dart b/pkg/analysis_server/test/services/completion/imported_computer_test.dart
index 6c8cf16d99434cf3cc0e456b87fd3c88d6e1d199..bbbff651d1c36caa7abd34aa19d51f323ce0d224 100644
--- a/pkg/analysis_server/test/services/completion/imported_computer_test.dart
+++ b/pkg/analysis_server/test/services/completion/imported_computer_test.dart
@@ -142,6 +142,24 @@ class ImportedComputerTest extends AbstractSelectorSuggestionTest {
   }
 
   @override
+  test_partFile_TypeName() {
+    return super.test_partFile_TypeName().then((_) {
+      expect(
+          request.cache.importKey,
+          'part of libA;');
+    });
+  }
+
+  @override
+  test_partFile_TypeName2() {
+    return super.test_partFile_TypeName2().then((_) {
+      expect(
+          request.cache.importKey,
+          'library libA;import "/testB.dart";part "/testA.dart";');
+    });
+  }
+
+  @override
   test_Block_inherited_imported() {
     return super.test_Block_inherited_imported().then((_) {
       assertCached('E');