trikitrok · February 9, 2026 08:31 · Feb 9, 2026 · Feb 6, 2026 · Feb 6, 2026
diff --git a/AlarmTest.java b/AlarmTest.java
@@ -94,7 +94,7 @@ public AlarmForTesting(Double... values) {
         }
 
         @Override
-        protected void showMessage(String message) {
+        protected void notify(String message) {
             shownMessages.add(message);
         }
 

diff --git a/AlarmTest.java b/AlarmTest.java
@@ -65,7 +65,7 @@ private void checkNoMessagesWereShown() {
     }
 
     private void checkShownMessagesWere(String... expectedMessages) {
-        assertThat(this.alarm.shownMessages).isEqualTo(Arrays.asList(expectedMessages));
+        assertThat(alarm.shownMessages).isEqualTo(Arrays.asList(expectedMessages));
     }
 
     private AlarmForTesting aDeactivatedAfterActivationAlarmSampling(double sampledValue) {

diff --git a/AlarmTest.java b/AlarmTest.java
@@ -0,0 +1,107 @@
+package unit_tests;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+import tirepressuremonitoringsystem.Alarm;
+
+import java.util.*;
+import java.util.stream.Stream;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class AlarmTest {
+
+    private AlarmForTesting alarm;
+
+    @Test
+    void alarm_activates_when_sampled_pressure_is_too_low() {
+        alarm = alarmSampling(16.99);
+
+        alarm.check();
+
+        checkShownMessagesWere("Alarm activated!");
+    }
+
+    @ParameterizedTest
+    @ValueSource(doubles = {17.00, 21.00})
+    void alarm_does_not_activate_when_sampled_pressure_is_safe(double sampledPressure) {
+        alarm = alarmSampling(sampledPressure);
+
+        alarm.check();
+
+        checkNoMessagesWereShown();
+    }
+
+    @Test
+    void alarm_activates_when_sampled_pressure_is_too_high() {
+        alarm = alarmSampling(21.01);
+
+        alarm.check();
+
+        checkShownMessagesWere("Alarm activated!");
+    }
+
+    @Test
+    void activated_alarm_does_not_notify_activation_again_when_sampled_pressure_is_not_safe() {
+        alarm = anActivatedAlarmSampling(25.0);
+
+        alarm.check();
+
+        checkShownMessagesWere("Alarm activated!");
+    }
+
+    @Test
+    public void deactivated_alarm_after_activation_activates_when_sampled_pressure_is_not_safe() {
+        alarm = aDeactivatedAfterActivationAlarmSampling(50.0);
+
+        alarm.check();
+
+        checkShownMessagesWere("Alarm activated!", "Alarm deactivated!", "Alarm activated!");
+    }
+
+    private void checkNoMessagesWereShown() {
+        checkShownMessagesWere();
+    }
+
+    private void checkShownMessagesWere(String... expectedMessages) {
+        assertThat(this.alarm.shownMessages).isEqualTo(Arrays.asList(expectedMessages));
+    }
+
+    private AlarmForTesting aDeactivatedAfterActivationAlarmSampling(double sampledValue) {
+        var alarm = anActivatedAlarmSampling(18.00, sampledValue);
+        alarm.check();
+        return alarm;
+    }
+
+    private AlarmForTesting anActivatedAlarmSampling(Double... sampledValues) {
+        var alarm = alarmSampling(Stream.concat(Stream.of(200.00), Arrays.stream(sampledValues)).toArray(Double[]::new));
+        alarm.check();
+        return alarm;
+    }
+
+    private AlarmForTesting alarmSampling(Double... values) {
+        return new AlarmForTesting(values);
+    }
+
+    static class AlarmForTesting extends Alarm {
+        private final Queue<Double> sampledValues;
+        public List<String> shownMessages;
+
+        public AlarmForTesting(Double... values) {
+            this.shownMessages = new ArrayList<>();
+            this.sampledValues = new ArrayDeque<>(Arrays.asList(values));
+        }
+
+        @Override
+        protected void showMessage(String message) {
+            shownMessages.add(message);
+        }
+
+        @Override
+        protected double sampleValue() {
+            return sampledValues.remove();
+        }
+    }
+}
+
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