Separate the API's used by ContextManager.

pkg/analysis_server/test/operation/operation_queue_test.dart

Index: pkg/analysis_server/test/operation/operation_queue_test.dart
diff --git a/pkg/analysis_server/test/operation/operation_queue_test.dart b/pkg/analysis_server/test/operation/operation_queue_test.dart
index 71569e8569444ae4260049865f5740037c802bc5..47f0bcf7811651bcbfcbd4a0fd3c414eab0a3121 100644
--- a/pkg/analysis_server/test/operation/operation_queue_test.dart
+++ b/pkg/analysis_server/test/operation/operation_queue_test.dart
@@ -5,6 +5,7 @@
 library test.operation.queue;
 
 import 'package:analysis_server/src/analysis_server.dart';
+import 'package:analysis_server/src/context_manager.dart';
 import 'package:analysis_server/src/operation/operation.dart';
 import 'package:analysis_server/src/operation/operation_analysis.dart';
 import 'package:analysis_server/src/operation/operation_queue.dart';
@@ -39,7 +40,6 @@ class AnalysisContextMock extends TypedMock implements InternalAnalysisContext {
 }
 
 class AnalysisServerMock extends TypedMock implements AnalysisServer {
-
   @override
   final ResourceProvider resourceProvider;
 
@@ -51,8 +51,7 @@ class AnalysisServerMock extends TypedMock implements AnalysisServer {
   noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
 }
 
-class ServerContextManagerMock extends TypedMock
-    implements ServerContextManager {
+class ServerContextManagerMock extends TypedMock implements ContextManager {
   noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
 }