Add pause_after_load to the config file.

test/runner/configuration/top_level_error_test.dart

 // Copyright (c) 2016, 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.
 
 @TestOn("vm")
 
 import 'dart:convert';
 
 import 'package:scheduled_test/descriptor.dart' as d;
 import 'package:scheduled_test/scheduled_test.dart';
 import 'package:test/src/util/exit_codes.dart' as exit_codes;
 
 import '../../io.dart';
 
 void main() {
   useSandbox();
 
+  test("rejects an invalid pause_after_load", () {
+    d.file("dart_test.yaml", JSON.encode({
+      "pause_after_load": "flup"
+    })).create();
+
+    var test = runTest(["test.dart"]);
+    test.stderr.expect(containsInOrder([
+      "pause_after_load must be a boolean",
+      "^^^^^^"
+    ]));
+    test.shouldExit(exit_codes.data);
+  });
+
   test("rejects an invalid verbose_trace", () {
     d.file("dart_test.yaml", JSON.encode({
       "verbose_trace": "flup"
     })).create();
 
     var test = runTest(["test.dart"]);
     test.stderr.expect(containsInOrder([
       "verbose_trace must be a boolean",
       "^^^^^^"
     ]));
@@ skipping 281 matching lines @@
 
       var test = runTest(["test.dart"]);
       test.stderr.expect(containsInOrder([
         'Invalid filename: expected ",".',
         "^^^^^^"
       ]));
       test.shouldExit(exit_codes.data);
     });
   });
 }