Fix two problems with the analyzer suite:

pkg/testing/lib/src/run_tests.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.md file.
 
 library testing.run_tests;
 
 import 'dart:async' show
     Future;
 
 import 'dart:io' show
@@ skipping 20 matching lines @@
     enableVerboseOutput,
     isVerbose,
     logMessage,
     logSuiteComplete,
     logTestComplete;
 
 import 'run.dart' show
     SuiteRunner,
     runProgram;
 
-import 'suite.dart' show
-    Suite;
-
 class CommandLine {
   final Set<String> options;
   final List<String> arguments;
 
   CommandLine(this.options, this.arguments);
 
   bool get verbose => options.contains("--verbose") || options.contains("-v");
 
   Set<String> get skip => commaSeparated("--skip=");
 
@@ skipping 106 matching lines @@
   if (cl.verbose) {
     enableVerboseOutput();
   }
   Map<String, String> environment = cl.environment;
   Uri configuration = await cl.configuration;
   if (configuration == null) return;
   if (!isVerbose) {
     print("Use --verbose to display more details.");
   }
   TestRoot root = await TestRoot.fromUri(configuration);
-  Set<String> skip = cl.skip;
-  Set<String> selectedSuites = cl.selectedSuites;
-  List<Suite> suites = root.suites.where((s) {
-    return !skip.contains(s.name) &&
-        (selectedSuites.isEmpty || selectedSuites.contains(s.name));
-  }).toList();
-  SuiteRunner runner = new SuiteRunner(suites, environment, cl.selectors);
+  SuiteRunner runner = new SuiteRunner(root.suites, environment, cl.selectors,
+      cl.selectedSuites, cl.skip);
   String program = await runner.generateDartProgram();
-  await runner.analyze(root.packages);
+  bool hasAnalyzerSuites = await runner.analyze(root.packages);
   Stopwatch sw = new Stopwatch()..start();
   if (program == null) {
-    fail("No tests configured.");
+    if (!hasAnalyzerSuites) {
+      fail("No tests configured.");
+    }
   } else {
     await runProgram(program, root.packages);
   }
   print("Running tests took: ${sw.elapsed}.");
 });
 
 Future<Null> runTests(Map<String, Function> tests) =>
 withErrorHandling(() async {
   int completed = 0;
   for (String name in tests.keys) {
     StringBuffer sb = new StringBuffer();
     try {
       await runGuarded(() {
         print("Running test $name");
         return tests[name]();
       }, printLineOnStdout: sb.writeln);
       logMessage(sb);
     } catch (e) {
       print(sb);
       rethrow;
     }
     logTestComplete(++completed, 0, tests.length, null, null);
   }
   logSuiteComplete();
 });