BAEL-3125

java-math/src/test/java/com/baeldung/algorithms/logarithm/LogarithmUnitTest.java

@@ -0,0 +1,31 @@
+package com.baeldung.algorithms.logarithm;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.Test;
+
+public class CombinationUnitTest {
+
+    @Test
+    public void givenLog10_shouldReturnValidResults() {
+        assertEquals(Math.log10(100), 2);
+        assertEquals(Math.log10(1000), 3);
+    }
+
+    @Test
+    public void givenLog10_shouldReturnValidResults() {
+        assertEquals(Math.log(Math.E), 1);
+        assertEquals(Math.log(10), 2.30258);
+    }
+
+    @Test
+    public void givenCustomLog_shouldReturnValidResults() {
+        assertEquals(customLog(2, 256), 8);
+        assertEquals(customLog(10, 100), 2);
+    }
+
+    private static double customLog(double base, double logNumber) {
+        return Math.log(logNumber) / Math.log(base);
+    }
+
+}