diff --git a/src/test/java/ch/usi/inf/sa4/sanmarinoes/smarthut/KnobDimmerTests.java b/src/test/java/ch/usi/inf/sa4/sanmarinoes/smarthut/KnobDimmerTests.java
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--- /dev/null
+++ b/src/test/java/ch/usi/inf/sa4/sanmarinoes/smarthut/KnobDimmerTests.java
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+package ch.usi.inf.sa4.sanmarinoes.smarthut;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import ch.usi.inf.sa4.sanmarinoes.smarthut.models.DimmableLight;
+import ch.usi.inf.sa4.sanmarinoes.smarthut.models.KnobDimmer;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+
+@DisplayName("A Knob Dimmer")
+public class KnobDimmerTests {
+
+    KnobDimmer knobDimmer;
+
+    @BeforeEach
+    public void createNewKnobDimmer() {
+        this.knobDimmer = new KnobDimmer();
+    }
+
+    @Nested
+    @DisplayName(" when multiple lights are present")
+    class MultipleLights {
+
+        @BeforeEach
+        public void setLights() {
+            DimmableLight dl;
+            for (int i = 0; i < 3; i++) {
+                dl = new DimmableLight();
+                dl.setIntensity(10);
+                ;
+                knobDimmer.addDimmableLight(dl);
+            }
+        }
+
+        @Test
+        @DisplayName(" set the intensity ")
+        public void increase() {
+            knobDimmer.setLightIntensity(30);
+            for (DimmableLight dl : knobDimmer.getOutputs()) {
+                assertEquals(30, dl.getIntensity());
+            }
+        }
+    }
+}