diff --git a/projjpn/src/main/java/de/hs_fulda/ciip/projjpn/Customers.java b/projjpn/src/main/java/de/hs_fulda/ciip/projjpn/Customers.java
new file mode 100644
index 0000000..f495ca9
--- /dev/null
+++ b/projjpn/src/main/java/de/hs_fulda/ciip/projjpn/Customers.java
@@ -0,0 +1,15 @@
+package de.hs_fulda.ciip.projjpn;
+
+import java.util.HashMap;
+
+public class Customers {
+	HashMap<String, User> pool = new HashMap<String, User>();
+	
+	public boolean nickNameAvailable(String nickname) {
+		User u = pool.get(nickname);
+		if (null == u) {
+			return true;
+		}
+		return false;
+	}
+}
diff --git a/projjpn/src/test/java/de/hs_fulda/ciip/projjpn/CustomersTest.java b/projjpn/src/test/java/de/hs_fulda/ciip/projjpn/CustomersTest.java
new file mode 100644
index 0000000..5b6a59d
--- /dev/null
+++ b/projjpn/src/test/java/de/hs_fulda/ciip/projjpn/CustomersTest.java
@@ -0,0 +1,20 @@
+package de.hs_fulda.ciip.projjpn;
+
+import junit.framework.TestCase;
+
+public class CustomersTest extends TestCase {
+
+	public void test_nicknameIsFree() {
+		// Given
+		Customers customers = new Customers();
+		String availableNickname = "beastMaster64";
+		
+		// When
+		boolean nicknameIsAvailable = customers.nickNameAvailable(availableNickname);
+		
+		// Then
+		assertTrue(nicknameIsAvailable);
+		
+	}
+
+}