Index: libadblockplus-android-tests/src/org/adblockplus/libadblockplus/tests/UtilsTest.java
diff --git a/libadblockplus-android-tests/src/org/adblockplus/libadblockplus/tests/UtilsTest.java b/libadblockplus-android-tests/src/org/adblockplus/libadblockplus/tests/UtilsTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..a9dfd4cb57724fd7e345290a834d7e69b16dbe46
--- /dev/null
+++ b/libadblockplus-android-tests/src/org/adblockplus/libadblockplus/tests/UtilsTest.java
@@ -0,0 +1,55 @@
+package org.adblockplus.libadblockplus.tests;
+
+import org.adblockplus.libadblockplus.android.Utils;
+import org.junit.Test;
+
+import java.util.Arrays;
+import java.util.LinkedList;
+import java.util.List;
+
+/**
+ * Test for Utils
+ */
+public class UtilsTest extends BaseJsTest
+{
+  @Test
+  public void testJson_null()
+  {
+    final List<String> list = null;
+    String json = Utils.stringListToJsonArray(list);
+    assertEquals("[]", json);
+  }
+
+  @Test
+  public void testJson_single()
+  {
+    final List<String> list = Arrays.asList("string1");
+    String json = Utils.stringListToJsonArray(list);
+    assertEquals("[\"string1\"]", json);
+  }
+
+  @Test
+  public void testJson_multiple()
+  {
+    final List<String> list = Arrays.asList("string1", "string2");
+    String json = Utils.stringListToJsonArray(list);
+    assertEquals("[\"string1\",\"string2\"]", json);
+  }
+
+  @Test
+  public void testJson_multipleWithNull()
+  {
+    final List<String> list = Arrays.asList("string1", null, "string2");
+    String json = Utils.stringListToJsonArray(list);
+    assertEquals("[\"string1\",\"string2\"]", json);
+  }
+
+  @Test
+  public void testJson_singleWithNull()
+  {
+    final List<String> list = new LinkedList<String>();
+    list.add(null);
+    String json = Utils.stringListToJsonArray(list);
+    assertEquals("[]", json);
+  }
+}