fix unit test

algorithms/src/test/java/com/baeldung/algorithms/insertionsort/InsertionSortUnitTest.java

@@ -0,0 +1,25 @@
+package com.baeldung.algorithms.insertionsort;
+
+import com.baeldung.algorithms.insertionsort.InsertionSort;
+import org.junit.Test;
+
+import static org.junit.Assert.assertArrayEquals;
+
+public class InsertionSortUnitTest {
+
+    @Test
+    public void givenUnsortedArray_whenInsertionSortImperative_thenSortedAsc() {
+        int[] input = {6, 2, 3, 4, 5, 1};
+        InsertionSort.insertionSortImperative(input);
+        int[] expected = {1, 2, 3, 4, 5, 6};
+        assertArrayEquals("the two arrays are not equal", expected, input);
+    }
+
+    @Test
+    public void givenUnsortedArray_whenInsertionSortRecursive_thenSortedAsc() {
+        int[] input = {6, 4, 5, 2, 3, 1};
+        InsertionSort.insertionSortRecursive(input);
+        int[] expected = {1, 2, 3, 4, 5, 6};
+        assertArrayEquals("the two arrays are not equal", expected, input);
+    }
+}