chore(test): add test

measure/src/test/java/net/laprun/sustainability/power/measure/OngoingPowerMeasureTest.java

@@ -0,0 +1,52 @@
+package net.laprun.sustainability.power.measure;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+import net.laprun.sustainability.power.SensorMetadata;
+
+public class OngoingPowerMeasureTest {
+
+    @Test
+    void testStatistics() {
+        final var m1c1 = 10.0;
+        final var m1c2 = 12.0;
+        final var m2c1 = 8.0;
+        final var m2c2 = 17.0;
+        final var metadata = new SensorMetadata(null, null) {
+
+            @Override
+            public int componentCardinality() {
+                return 2;
+            }
+        };
+        final var measure = new OngoingPowerMeasure(metadata, 1, 500);
+
+        final var components = new double[metadata.componentCardinality()];
+        components[0] = m1c1;
+        components[1] = m1c2;
+        measure.recordMeasure(components);
+
+        components[0] = m2c1;
+        components[1] = m2c2;
+        measure.recordMeasure(components);
+
+        assertEquals(m1c1 + m1c2 + m2c1 + m2c2, measure.total());
+        assertEquals((m1c1 + m1c2 + m2c1 + m2c2) / 2, measure.average());
+        assertEquals(Math.min(m1c1 + m1c2, m2c1 + m2c2), measure.minMeasuredTotal());
+        assertEquals(Math.max(m1c1 + m1c2, m2c1 + m2c2), measure.maxMeasuredTotal());
+        final var c1Avg = measure.averagesPerComponent()[0];
+        final var c2Avg = measure.averagesPerComponent()[1];
+        assertEquals((m1c1 + m2c1) / 2, c1Avg);
+        assertEquals((m1c2 + m2c2) / 2, c2Avg);
+
+        final var stdVarForC1 = Math.sqrt(Math.pow(m1c1 - c1Avg, 2) + Math.pow(m2c1 - c1Avg, 2));
+        final var stdVarForC2 = Math.sqrt(Math.pow(m1c2 - c2Avg, 2) + Math.pow(m2c2 - c2Avg, 2));
+
+        assertEquals(stdVarForC1, measure.standardDeviations().perComponent()[0], 0.0001,
+                "Standard Deviation did not match the expected value");
+        assertEquals(stdVarForC2, measure.standardDeviations().perComponent()[1], 0.0001,
+                "Standard Deviation did not match the expected value");
+    }
+}