Add integration tests for postfix server api

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

Index: pkg/analysis_server/test/integration/edit/test_all.dart
diff --git a/pkg/analysis_server/test/integration/edit/test_all.dart b/pkg/analysis_server/test/integration/edit/test_all.dart
index ed888fc9344b05282b66316b9ac636d7352ca2fe..28965abaca4239d87e68a526bdeedb6c2a02739f 100644
--- a/pkg/analysis_server/test/integration/edit/test_all.dart
+++ b/pkg/analysis_server/test/integration/edit/test_all.dart
@@ -10,7 +10,12 @@ import 'get_available_refactorings_test.dart'
     as get_available_refactorings_test;
 import 'get_fixes_test.dart' as get_fixes_test;
 import 'get_refactoring_test.dart' as get_refactoring_test;
+import 'get_postfix_completion_test.dart' as get_postfix_completion_test;
 import 'get_statement_completion_test.dart' as get_statement_completion_test;
+import 'is_postfix_completion_applicable_test.dart'
+    as is_postfix_completion_applicable_test;
+import 'list_postfix_completion_templates_test.dart'
+    as list_postfix_completion_templates_test;
 import 'organize_directives_test.dart' as organize_directives_test;
 import 'sort_members_test.dart' as sort_members_test;
 
@@ -21,7 +26,10 @@ main() {
     get_available_refactorings_test.main();
     get_fixes_test.main();
     get_refactoring_test.main();
+    get_postfix_completion_test.main();
     get_statement_completion_test.main();
+    is_postfix_completion_applicable_test.main();
+    list_postfix_completion_templates_test.main();
     organize_directives_test.main();
     sort_members_test.main();
   }, name: 'edit');