Add integration tests for postfix server api

pkg/analysis_server/test/integration/edit/list_postfix_completion_templates_test.dart

Index: pkg/analysis_server/test/integration/edit/list_postfix_completion_templates_test.dart
diff --git a/pkg/analysis_server/test/integration/edit/list_postfix_completion_templates_test.dart b/pkg/analysis_server/test/integration/edit/list_postfix_completion_templates_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..f554b3e0826664527f48ee8af1b24fd4212157ed
--- /dev/null
+++ b/pkg/analysis_server/test/integration/edit/list_postfix_completion_templates_test.dart
@@ -0,0 +1,42 @@
+// Copyright (c) 2017, 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.
+
+import 'package:analysis_server/protocol/protocol_generated.dart';
+import 'package:analyzer_plugin/protocol/protocol_common.dart';
+import 'package:test/test.dart';
+import 'package:test_reflective_loader/test_reflective_loader.dart';
+
+import '../support/integration_tests.dart';
+
+main() {
+  defineReflectiveSuite(() {
+    defineReflectiveTests(ListPostfixCompletionTemplatesTest);
+  });
+}
+
+@reflectiveTest
+class ListPostfixCompletionTemplatesTest
+    extends AbstractAnalysisServerIntegrationTest {
+  test_list_postfix_completion_templates() async {
+    String pathname = sourcePath('test.dart');
+    String text = r'''
+void bar() {
+  foo();.tryon
+}
+void foo() { }
+''';
+    text = text.replaceAll('.tryon', '');
+    writeFile(pathname, text);
+    standardAnalysisSetup();
+
+    await analysisFinished;
+
+    // expect a postfix template list result
+    EditListPostfixCompletionTemplatesResult result =
+        await sendEditListPostfixCompletionTemplates();
+    expect(result.templates, isNotNull);
+    expect(result.templates.length, greaterThan(15));
+    expect(result.templates[0].runtimeType, PostfixTemplateDescriptor);
+  }
+}