Add configuration support for choosing test paths.

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';
@@ skipping 140 matching lines @@
       "platforms": ["foo"]
     })).create();
 
     var test = runTest(["test.dart"]);
     test.stderr.expect(containsInOrder([
       'Unknown platform "foo"',
       "^^^^^"
     ]));
     test.shouldExit(exit_codes.data);
   });
+
+  test("rejects an invalid paths list type", () {
+    d.file("dart_test.yaml", JSON.encode({
+      "paths": "test"
+    })).create();
+
+    var test = runTest(["test.dart"]);
+    test.stderr.expect(containsInOrder([
+      "paths must be a list",
+      "^^^^^^"
+    ]));
+    test.shouldExit(exit_codes.data);
+  });
+
+  test("rejects an invalid paths member type", () {
+    d.file("dart_test.yaml", JSON.encode({
+      "paths": [12]
+    })).create();
+
+    var test = runTest(["test.dart"]);
+    test.stderr.expect(containsInOrder([
+      "Paths must be strings",
+      "^^"
+    ]));
+    test.shouldExit(exit_codes.data);
+  });
+
+  test("rejects an absolute path", () {
+    d.file("dart_test.yaml", JSON.encode({
+      "paths": ["/foo"]
+    })).create();
+
+    var test = runTest(["test.dart"]);
+    test.stderr.expect(containsInOrder([
+      'Paths must be relative.',
+      "^^^^^^"
+    ]));
+    test.shouldExit(exit_codes.data);
+  });
+
+  test("rejects an invalid path URI", () {
+    d.file("dart_test.yaml", JSON.encode({
+      "paths": ["[invalid]"]
+    })).create();
+
+    var test = runTest(["test.dart"]);
+    test.stderr.expect(containsInOrder([
+      'Invalid path: Invalid character',
+      "^^^^^^^^^"
+    ]));
+    test.shouldExit(exit_codes.data);
+  });
+
+  test("rejects an invalid filename type", () {
+    d.file("dart_test.yaml", JSON.encode({
+      "filename": 12
+    })).create();
+
+    var test = runTest(["test.dart"]);
+    test.stderr.expect(containsInOrder([
+      'filename must be a string.',
+      "^^"
+    ]));
+    test.shouldExit(exit_codes.data);
+  });
+
+  test("rejects an invalid filename format", () {
+    d.file("dart_test.yaml", JSON.encode({
+      "filename": "{foo"
+    })).create();
+
+    var test = runTest(["test.dart"]);
+    test.stderr.expect(containsInOrder([
+      'Invalid filename: expected ",".',
+      "^^^^^^"
+    ]));
+    test.shouldExit(exit_codes.data);
+  });
 }