Add first replay test (#8628)

dev/bots/test.dart

diff --git a/dev/bots/test.dart b/dev/bots/test.dart
index 5c2a505..71e4d58 100644
--- a/dev/bots/test.dart
+++ b/dev/bots/test.dart
@@ -6,6 +6,7 @@
 String flutterRoot = p.dirname(p.dirname(p.dirname(p.fromUri(Platform.script))));
 String flutter = p.join(flutterRoot, 'bin', Platform.isWindows ? 'flutter.bat' : 'flutter');
 String dart = p.join(flutterRoot, 'bin', 'cache', 'dart-sdk', 'bin', Platform.isWindows ? 'dart.exe' : 'dart');
+String pub = p.join(flutterRoot, 'bin', 'cache', 'dart-sdk', 'bin', Platform.isWindows ? 'pub.bat' : 'pub');
 String flutterTestArgs = Platform.environment['FLUTTER_TEST_ARGS'];
 
 /// When you call this, you can set FLUTTER_TEST_ARGS to pass custom
@@ -81,6 +82,9 @@
     await _runAllDartTests(p.join(flutterRoot, 'packages', 'flutter_tools'),
       environment: <String, String>{ 'FLUTTER_ROOT': flutterRoot },
     );
+    await _pubRunTest(p.join(flutterRoot, 'packages', 'flutter_tools'),
+      testPath: 'test/replay',
+    );
 
     await _runAllDartTests(p.join(flutterRoot, 'dev', 'devicelab'));
     await _runFlutterTest(p.join(flutterRoot, 'dev', 'manual_tests'));
@@ -93,6 +97,16 @@
   }
 }
 
+Future<Null> _pubRunTest(
+  String workingDirectory, {
+  String testPath,
+}) {
+  final List<String> args = <String>['run', 'test'];
+  if (testPath != null)
+    args.add(testPath);
+  return _runCmd(pub, args, workingDirectory: workingDirectory);
+}
+
 Future<Null> _runCmd(String executable, List<String> arguments, {
   String workingDirectory,
   Map<String, String> environment,