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diff --git a/net.mograsim.logic.ui.am2900/test/net/mograsim/logic/ui/am2900/TestUtil.java b/net.mograsim.logic.ui.am2900/test/net/mograsim/logic/ui/am2900/TestUtil.java
new file mode 100644
index 00000000..08c7982e
--- /dev/null
+++ b/net.mograsim.logic.ui.am2900/test/net/mograsim/logic/ui/am2900/TestUtil.java
@@ -0,0 +1,22 @@
+package net.mograsim.logic.ui.am2900;
+
+public final class TestUtil
+{
+	private TestUtil()
+	{
+
+	}
+
+	/**
+	 * Transforms the last four bits of an int to a string that contains the binary ('1' and '0') representation of the 4 bits
+	 */
+	public static String to4bitBin(int x)
+	{
+		StringBuilder sb = new StringBuilder(4);
+		sb.append((x & 0b1000) == 0 ? '0' : '1');
+		sb.append((x & 0b0100) == 0 ? '0' : '1');
+		sb.append((x & 0b0010) == 0 ? '0' : '1');
+		sb.append((x & 0b0001) == 0 ? '0' : '1');
+		return sb.toString();
+	}
+}