Analyze more tests.

packages/flutter_tools/lib/src/commands/analyze.dart

@@ -95,10 +95,13 @@ class AnalyzeCommand extends FlutterCommand {
 
       // .../packages/*/bin/*.dart
       // .../packages/*/lib/main.dart
+      // .../packages/*/test/*_test.dart
+      // .../packages/*/test/*/*_test.dart
       Directory packages = new Directory(path.join(ArtifactStore.flutterRoot, 'packages'));
       for (FileSystemEntity entry in packages.listSync()) {
         if (entry is Directory) {
           bool foundOne = false;
+
           Directory binDirectory = new Directory(path.join(entry.path, 'bin'));
           if (binDirectory.existsSync()) {
             for (FileSystemEntity subentry in binDirectory.listSync()) {
@@ -108,11 +111,30 @@ class AnalyzeCommand extends FlutterCommand {
               }
             }
           }
+
           String mainPath = path.join(entry.path, 'lib', 'main.dart');
           if (FileSystemEntity.isFileSync(mainPath)) {
             dartFiles.add(mainPath);
             foundOne = true;
           }
+
+          Directory testDirectory = new Directory(path.join(entry.path, 'test'));
+          if (testDirectory.existsSync()) {
+            for (FileSystemEntity entry in testDirectory.listSync()) {
+              if (entry is Directory) {
+                for (FileSystemEntity subentry in entry.listSync()) {
+                  if (subentry is File && subentry.path.endsWith('_test.dart')) {
+                    dartFiles.add(subentry.path);
+                    foundTest = true;
+                  }
+                }
+              } else if (entry is File && entry.path.endsWith('_test.dart')) {
+                dartFiles.add(entry.path);
+                foundTest = true;
+              }
+            }
+          }
+
           if (foundOne)
             pubSpecDirectories.add(entry.path);
         }