Add testcase.

src/test/scala/util/StringUtilSpec.scala

@@ -18,4 +18,21 @@ class StringUtilSpec extends Specification {
     }
   }
 
+  "escapeHtml" should {
+    "escape &, <, > and \"" in {
+      StringUtil.escapeHtml("<a href=\"/test\">a & b</a>") mustEqual "&lt;a href=&quot;/test&quot;&gt;a &amp; b&lt;/a&gt;"
+    }
+  }
+
+  "md5" should {
+    "generate MD5 hash" in {
+      StringUtil.md5("abc") mustEqual "900150983cd24fb0d6963f7d28e17f72"
+    }
+  }
+
+  "sha1" should {
+    "generate SHA1 hash" in {
+      StringUtil.sha1("abc") mustEqual "a9993e364706816aba3e25717850c26c9cd0d89d"
+    }
+  }
 }