Java API: star detector is covered by tests

modules/java/android_test/src/org/opencv/test/features2d/StarDetectorTest.java

 package org.opencv.test.features2d;
 
+import org.opencv.core.Core;
+import org.opencv.core.CvType;
+import org.opencv.core.Mat;
+import org.opencv.core.Point;
+import org.opencv.core.RotatedRect;
+import org.opencv.core.Scalar;
+import org.opencv.core.Size;
+import org.opencv.features2d.KeyPoint;
 import org.opencv.features2d.StarDetector;
 import org.opencv.test.OpenCVTestCase;
+import org.opencv.test.OpenCVTestRunner;
+
+import java.util.LinkedList;
+import java.util.List;
 
 public class StarDetectorTest extends OpenCVTestCase {
-	
-	private StarDetector star;
-	
-    @Override
-    protected void setUp() throws Exception {
-        super.setUp();
+
+    public void test_1() {
+        super.test_1("FEATURES2D.StarDetector");
+    }
+    
+    private Mat getStarImg()
+    {
+        Scalar color = new Scalar(0);
+        int center = 100;
+        int radius = 5;
+        int offset = 40;
+        
+        Mat img = new Mat(200, 200, CvType.CV_8U, new Scalar(255));
+        Core.circle(img, new Point(center - offset, center), radius, color, -1);
+        Core.circle(img, new Point(center + offset, center), radius, color, -1);
+        Core.circle(img, new Point(center, center - offset), radius, color, -1);
+        Core.circle(img, new Point(center, center + offset), radius, color, -1);
+        Core.circle(img, new Point(center, center), radius, color, -1);
+        return img;
+    }
+
+    public void testDetect() {
+        Mat img = getStarImg();
+        List<KeyPoint> keypoints = new LinkedList<KeyPoint>();
+        StarDetector star = new StarDetector();
         
-        star = null;
+        star.detect(img, keypoints);
+        
+        KeyPoint truth = new KeyPoint(100, 100, 8, -1,-223.40334f, 0, -1);
+        assertEquals(1, keypoints.size());
+        assertKeyPointEqual(truth, keypoints.get(0), EPS);
+    }
+
+    public void testStarDetector() {
+        StarDetector star = new StarDetector();
+        assertNotNull(star);
+    }
+
+    public void testStarDetectorIntIntIntIntInt() {
+        StarDetector star = new StarDetector(45, 30, 10, 8, 5);
+        assertNotNull(star);
     }
-	
-	public void test_1() {
-		super.test_1("FEATURES2D.StarDetector");
-	}
-
-	public void testStarDetector() {
-		star = new StarDetector();
-		assertTrue(null != star);
-	}
-	
-	public void testStarDetectorIntIntIntIntInt() {
-		star = new StarDetector(45, 30, 10, 8, 5);
-		assertTrue(null != star);
-	}
 
 }