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diff --git a/era.mi/src/era/mi/logic/tests/TestBitDisplay.java b/era.mi/src/era/mi/logic/tests/TestBitDisplay.java
new file mode 100644
index 00000000..99131163
--- /dev/null
+++ b/era.mi/src/era/mi/logic/tests/TestBitDisplay.java
@@ -0,0 +1,48 @@
+package era.mi.logic.tests;
+
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+
+import java.util.Arrays;
+import java.util.function.LongConsumer;
+
+import era.mi.logic.Bit;
+import era.mi.logic.Simulation;
+import era.mi.logic.components.BitDisplay;
+import era.mi.logic.wires.WireArray;
+
+public final class TestBitDisplay extends BitDisplay
+{
+
+	public TestBitDisplay(WireArray in)
+	{
+		super(in);
+	}
+
+	public void assertDisplays(Bit... expected)
+	{
+		assertArrayEquals(expected, getDisplayedValue());
+	}
+
+	public void assertAfterSimulationIs(Bit... expected)
+	{
+		Simulation.TIMELINE.executeAll();
+		assertDisplays(expected);
+	}
+
+	public void assertAfterSimulationIs(LongConsumer r, Bit... expected)
+	{
+		while (Simulation.TIMELINE.hasNext())
+			{
+				Simulation.TIMELINE.executeNext();
+				r.accept(Simulation.TIMELINE.getSimulationTime());
+			}
+		assertDisplays(expected);
+	}
+
+	@Override
+	protected void compute()
+	{
+		super.compute();
+		System.out.println("update: value is " + Arrays.toString(getDisplayedValue()));
+	}
+}