diff --git a/src/test/scala/util/StringUtilSpec.scala b/src/test/scala/util/StringUtilSpec.scala
new file mode 100644
index 0000000..0b77ac9
--- /dev/null
+++ b/src/test/scala/util/StringUtilSpec.scala
@@ -0,0 +1,21 @@
+package util
+
+import org.specs2.mutable._
+
+class StringUtilSpec extends Specification {
+
+  "urlDecode" should {
+    "decode encoded string to original string" in {
+      val encoded = StringUtil.urlEncode("あいうえお")
+      StringUtil.urlDecode(encoded) mustEqual "あいうえお"
+    }
+  }
+
+  "splitWords" should {
+    "split string by whitespaces" in {
+      val split = StringUtil.splitWords("aa bb\tcc　dd \t　ee")
+      split mustEqual Array("aa", "bb", "cc", "dd", "ee")
+    }
+  }
+
+}