Add test data utils tests

sample/src/androidTest/java/io/ona/kujaku/sample/TestDataUtilsTest.java

@@ -0,0 +1,43 @@
+package io.ona.kujaku.sample;
+
+import com.mapbox.geojson.Feature;
+
+import org.json.JSONArray;
+import org.junit.Test;
+
+import java.util.List;
+
+import static io.ona.kujaku.sample.utils.TestDataUtils.createFeatureJsonArray;
+import static io.ona.kujaku.sample.utils.TestDataUtils.createFeatureList;
+import static junit.framework.Assert.assertEquals;
+import static junit.framework.Assert.assertNotNull;
+
+/**
+ * @author Vincent Karuri
+ */
+public class TestDataUtilsTest {
+
+    @Test
+    public void testCreateFeatureListShouldNotBeEmptyList() {
+        List<Feature> features = null;
+        try {
+            features = createFeatureList(5, 0, 31.03823, -1.214348, "test_property", "Point", false, new String[]{"property1", "property2", "property3"}, 0.001);
+        } catch (Exception e) {
+
+        }
+        assertNotNull(features);
+        assertEquals(features.size(), 5);
+    }
+
+    @Test
+    public void testCreateFeatureJsonArrayShouldNotBeEmpty() {
+        JSONArray features = null;
+        try {
+            features = createFeatureJsonArray(5, 31.03823, -1.214348, "test_property", new String[]{"property1", "property2", "property3"});
+        } catch (Exception e) {
+
+        }
+        assertNotNull(features);
+        assertEquals(features.length(), 5);
+    }
+}

sample/src/main/java/io/ona/kujaku/sample/utils/TestDataUtils.java

@@ -116,11 +116,11 @@ public static List<Feature> createFeatureList(int numFeatures, int startingIndex
         double newLatitude = latitude;
 
         int featureNumber = startingIndex;
-        int prevFeatureNumber = startingIndex;
+        int prevFeatureNumber = -1;
 
         List<Feature> features = new ArrayList<>();
         final int FEATURE_GROUP_SIZE = featureGroup.length;
-        while (featureNumber < numFeatures + startingIndex + 1) {
+        while (featureNumber < numFeatures + startingIndex) {
             if (prevFeatureNumber != featureNumber) {
                 JSONObject feature = new JSONObject();
                 feature.put("id", "feature_" + UUID.randomUUID());