linter: Clean up dead test code

These likely could just be simplified after removing the old
integration tests. No tests are actually run in `rule_test.dart`.

Change-Id: I7f377368e100ee7eb5bcfdd5d9dba1e8bb26f43a
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/432400
Reviewed-by: Brian Wilkerson <[email protected]>
Commit-Queue: Samuel Rawlins <[email protected]>

Author: srawlins

pkg/linter/test/all.dart

@@ -12,7 +12,6 @@ import 'integration_test.dart' as integration;
 import 'lint_code_test.dart' as lint_code;
 import 'mocks.dart';
 import 'pubspec_test.dart' as pubspec;
-import 'rule_test.dart' as rule;
 import 'rules/all.dart' as rules;
 import 'scope_util_test.dart' as scope_util;
 import 'utils_test.dart' as utils;
@@ -37,7 +36,6 @@ void main() {
   integration.main();
   lint_code.main();
   pubspec.main();
-  rule.main();
   rules.main();
   scope_util.main();
   utils.main();

pkg/linter/test/integration_test.dart

@@ -2,39 +2,18 @@
 // 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 'dart:io';
-
-import 'package:analyzer/src/lint/io.dart';
 import 'package:test/test.dart';
 
 import '../tool/checks/check_all_yaml.dart';
 import '../tool/checks/check_messages_yaml.dart';
 
 void main() {
-  group('integration', () {
-    group('config', () {
-      var currentOut = outSink;
-      var collectingOut = StringBuffer();
-      setUp(() {
-        exitCode = 0;
-        outSink = collectingOut;
-      });
-      tearDown(() {
-        collectingOut.clear();
-        outSink = currentOut;
-        exitCode = 0;
-      });
-    });
-
-    group('examples', () {
-      test('all.yaml', () {
-        var errors = checkAllYaml();
-        if (errors != null) {
-          fail(errors);
-        }
-      });
-    });
-
-    test('messages.yaml', checkMessagesYaml);
+  test('examples/all.yaml is correct', () {
+    var errors = checkAllYaml();
+    if (errors != null) {
+      fail(errors);
+    }
   });
+
+  test('messages.yaml is correct', checkMessagesYaml);
 }