added TrytesConverterTest

src/test/java/jota/TrytesConverterTest.java

@@ -0,0 +1,21 @@
+package jota;
+
+import jota.utils.TrytesConverter;
+import org.junit.Test;
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Created by pinpong on 01.12.16.
+ */
+public class TrytesConverterTest {
+
+    @Test
+    public void shouldConvertStringToTrytes() {
+        assertEquals(TrytesConverter.toTrytes("Z"), "IC");
+    }
+    @Test
+    public void shouldConvertTrytesToString() {
+        assertEquals(TrytesConverter.toString("IC"), "Z");
+    }
+
+}