initial commit

algorithms/src/test/java/com/baeldung/algorithms/mergesort/MergeSortTest.java

@@ -0,0 +1,26 @@
+package com.baeldung.algorithms.mergesort;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+
+class MergeSortTest {
+
+    @Test
+    void positiveTest() {
+        int[] input = { 5, 1, 6, 2, 3, 4 };
+        int[] expected = { 1, 2, 3, 4, 5, 6 };
+        MergeSort.mergeSort(input, input.length);
+        assertArrayEquals(expected, input);
+    }
+    
+    @Test
+    void  negativeTest() {
+        int[] input = { 5, 1, 6, 2, 3, 4 };
+        int[] expected = { 1, 2, 3, 4, 6 ,5};
+        MergeSort.mergeSort(input, input.length);
+        assertArrayEquals(expected, input);
+    }
+
+}