fix test

Author: vkocheryzhkin

visionSamples/FaceTracker/app/src/androidTest/assets/1.png

@@ -4,12 +4,15 @@
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.support.test.InstrumentationRegistry;
+import android.util.Log;
 
 import org.junit.Test;
 
 import java.io.IOException;
 import java.io.InputStream;
 
+import static org.junit.Assert.assertEquals;
+
 public class FaceRecognizerTest {
     private static final String TAG = "FaceRecognizerTest";
 
@@ -18,10 +21,10 @@ public void RecognizeTest() throws IOException {
         FaceRecognizer fr = new FaceRecognizer();
         fr.loadNative();
         Context testContext = InstrumentationRegistry.getInstrumentation().getContext();
-        InputStream testInput = testContext.getAssets().open("1.png");
+        InputStream testInput = testContext.getAssets().open("2.bmp");
         Bitmap bitmap = BitmapFactory.decodeStream(testInput);
-//        Log.i(TAG, String.format("test1: %d", bitmap.getAllocationByteCount()));
-//        String res = fr.recognizeNative1(bitmap);
-//        assertEquals("Unknown", res);
+        Log.i(TAG, String.format("test1: %d", bitmap.getAllocationByteCount()));
+        String res = fr.recognizeNative1(bitmap);
+        assertEquals("Unknown", res);
     }
 }

visionSamples/FaceTracker/app/src/androidTest/assets/2.bmp

@@ -241,7 +241,12 @@ Java_dlib_android_FaceRecognizer_recognizeNative1(JNIEnv *env,
     }
 
     std::string returnValue = "Num Faces: ";
+
     std::vector<dlib::rectangle> dets = detector1(img);
+    if (dets.size() == 0){
+        std::string name = "Unknown";
+        return env->NewStringUTF(name.c_str());
+    }
     returnValue += std::to_string(dets.size());
     returnValue += ". ";