Add More Tests (#4148)

src/test/java/com/thealgorithms/maths/LeonardoNumberTest.java

@@ -0,0 +1,28 @@
+package com.thealgorithms.maths;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+public class LeonardoNumberTest {
+    @Test
+    void leonardoNumberNegative() {
+        assertThrows(ArithmeticException.class, ()-> LeonardoNumber.leonardoNumber(-1));
+    }
+    @Test
+    void leonardoNumberZero() {
+        assertEquals(1, LeonardoNumber.leonardoNumber(0));
+    }
+    @Test
+    void leonardoNumberOne() {
+        assertEquals(1, LeonardoNumber.leonardoNumber(1));
+    }
+    @Test
+    void leonardoNumberFive() {
+        assertEquals(15, LeonardoNumber.leonardoNumber(5));
+    }
+    @Test
+    void leonardoNumberTwenty() {
+        assertEquals(21891 , LeonardoNumber.leonardoNumber(20));
+    }
+}

src/test/java/com/thealgorithms/maths/LucasSeriesTest.java

@@ -0,0 +1,27 @@
+package com.thealgorithms.maths;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class LucasSeriesTest {
+    @Test
+    void lucasSeriesTwo() {
+        assertEquals(2, LucasSeries.lucasSeries(1));
+        assertEquals(2, LucasSeries.lucasSeriesIteration(1));
+    }
+    @Test
+    void lucasSeriesOne() {
+        assertEquals(1, LucasSeries.lucasSeries(2));
+        assertEquals(1, LucasSeries.lucasSeriesIteration(2));
+    }
+    @Test
+    void lucasSeriesSeven() {
+        assertEquals(7, LucasSeries.lucasSeries(5));
+        assertEquals(7, LucasSeries.lucasSeriesIteration(5));
+    }
+    @Test
+    void lucasSeriesEleven() {
+        assertEquals(123, LucasSeries.lucasSeries(11));
+        assertEquals(123, LucasSeries.lucasSeriesIteration(11));
+    }
+}

src/test/java/com/thealgorithms/maths/MedianTest.java

@@ -0,0 +1,36 @@
+package com.thealgorithms.maths;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class MedianTest {
+    @Test
+    void medianSingleValue() {
+        int[] arr = {0};
+        assertEquals(0, Median.median(arr));
+    }
+
+    @Test
+    void medianTwoValues() {
+        int[] arr = {1, 2};
+        assertEquals(1.5, Median.median(arr));
+    }
+
+    @Test
+    void medianThreeValues() {
+        int[] arr = {1, 2, 3};
+        assertEquals(2, Median.median(arr));
+    }
+
+    @Test
+    void medianDecimalValueReturn() {
+        int[] arr = {1, 2, 3, 4, 5, 6, 8, 9};
+        assertEquals(4.5, Median.median(arr));
+    }
+
+    @Test
+    void medianNegativeValues() {
+        int[] arr = {-27, -16, -7, -4, -2, -1};
+        assertEquals(-5.5, Median.median(arr));
+    }
+}