diff --git a/.idea/gradle.xml b/.idea/gradle.xml
index 5ffbb1a..186ae07 100644
--- a/.idea/gradle.xml
+++ b/.idea/gradle.xml
@@ -14,6 +14,7 @@
             <option value="$PROJECT_DIR$/module5" />
             <option value="$PROJECT_DIR$/module6" />
             <option value="$PROJECT_DIR$/module7" />
+            <option value="$PROJECT_DIR$/module8" />
           </set>
         </option>
       </GradleProjectSettings>
diff --git a/module5/src/main/java/com/hithomelabs/princeton1/module5/AbstractCustomSorts.java b/module5/src/main/java/com/hithomelabs/princeton1/module5/AbstractCustomSorts.java
index 86bfbbd..1df70bc 100644
--- a/module5/src/main/java/com/hithomelabs/princeton1/module5/AbstractCustomSorts.java
+++ b/module5/src/main/java/com/hithomelabs/princeton1/module5/AbstractCustomSorts.java
@@ -6,6 +6,9 @@ public abstract class AbstractCustomSorts<E> {
 
     // TODO: Implement this method
     public void exch(E[] arr, int j, int i) {
+        E temp = arr[j];
+        arr[j] = arr[i];
+        arr[i] = temp;
     }
 
     // TODO: Implement this method
diff --git a/module5/src/main/java/com/hithomelabs/princeton1/module5/Insertion.java b/module5/src/main/java/com/hithomelabs/princeton1/module5/Insertion.java
index a4117d4..6fa7efa 100644
--- a/module5/src/main/java/com/hithomelabs/princeton1/module5/Insertion.java
+++ b/module5/src/main/java/com/hithomelabs/princeton1/module5/Insertion.java
@@ -3,7 +3,29 @@ package com.hithomelabs.princeton1.module5;
 public class Insertion<E> extends AbstractCustomSorts<E> {
     @Override
     public void sort(E[] arr) {
+        int N = arr.length;
 
+        for(int i=0; i<N; i++){
+            for(int j=i; j>0; j--){
+                if(less( (Comparable<E>) arr[j], arr[j-1]))
+                    exch(arr, j, j-1);
+                else
+                    break;
+            }
+        }
+    }
+
+    public void sort(E[] arr, int h) {
+        int N = arr.length;
+
+        for(int i=0; i<N; i++){
+            for(int j=i; j>0; j=j-h){
+                if(less( (Comparable<E>) arr[j], arr[j-1]))
+                    exch(arr, j, j-1);
+                else
+                    break;
+            }
+        }
     }
 }
 
diff --git a/module5/src/main/java/com/hithomelabs/princeton1/module5/Selection.java b/module5/src/main/java/com/hithomelabs/princeton1/module5/Selection.java
index d483434..6638859 100644
--- a/module5/src/main/java/com/hithomelabs/princeton1/module5/Selection.java
+++ b/module5/src/main/java/com/hithomelabs/princeton1/module5/Selection.java
@@ -7,7 +7,16 @@ package com.hithomelabs.princeton1.module5;
 public class Selection<E> extends AbstractCustomSorts<E>{
     @Override
     public void sort(E[] arr) {
+        int N=arr.length;
 
+        for(int i=0; i<N; i++){
+            int min=i;
+            for(int j=i+1; j<N; j++){
+                if(less((Comparable<E>) arr[j], arr[min]))
+                    min=j;
+            }
+            exch(arr, min, i);
+        }
     }
 }
 
diff --git a/module5/src/main/java/com/hithomelabs/princeton1/module5/Shell.java b/module5/src/main/java/com/hithomelabs/princeton1/module5/Shell.java
index 620accd..7abc6fd 100644
--- a/module5/src/main/java/com/hithomelabs/princeton1/module5/Shell.java
+++ b/module5/src/main/java/com/hithomelabs/princeton1/module5/Shell.java
@@ -24,6 +24,10 @@ public class Shell<E> extends AbstractCustomSorts<E> {
  */
     @Override
     public void sort(E[] arr) {
+        Insertion<E> sortingAlgorithm = new Insertion<>();
+        sortingAlgorithm.sort(arr, 7);
+        sortingAlgorithm.sort(arr, 3);
+        sortingAlgorithm.sort(arr);
     }
 
     private int hsort(E[] arr, int h, MetaData metadata) {
diff --git a/module5/src/test/java/com/hithomelabs/princeton1/module5/SortTest.java b/module5/src/test/java/com/hithomelabs/princeton1/module5/SortTest.java
index 301c6d5..e2aa21d 100644
--- a/module5/src/test/java/com/hithomelabs/princeton1/module5/SortTest.java
+++ b/module5/src/test/java/com/hithomelabs/princeton1/module5/SortTest.java
@@ -6,51 +6,91 @@ import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 import com.hithomelabs.princeton1.common.Apple;
 import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
 import java.util.Random;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
 class SortTest {
 
-    private ArrayList<Apple> apples;
+    private Apple[] apples, applesCopy;
     private AbstractCustomSorts<Apple> sortingAlgorithm;
     private Random random;
 
     @BeforeEach
     void setUp() {
-        apples = new ArrayList<Apple>();
+        apples = new Apple[100];
+//        applesCopy = new Apple[100];
         //sortingAlgorithm = new Selection<Apple>();
         random = new Random();
     }
 
-    private void testSort(AbstractCustomSorts<Apple> sortingAlgorithm) {
-        for (int i = 0; i < 100; i++)
-            apples.add(new Apple(random.nextInt(100)));
+    private void testSort() {
+        int value;
+        for (int i = 0; i < 100; i++) {
+            value = random.nextInt(100);
+            apples[i] = new Apple(value);
+//            applesCopy[i] = new Apple(value);
+        }
 
     }
 
+    private boolean test(){
+        for(int i=0;i<99;i++){
+            if(apples[i].compareTo(apples[i+1]) > 0)
+                return false;
+        }
+        return true;
+    }
+
     @Test
     @DisplayName("Testing Insertion sort functionality")
     public void testInsertionSort() {
         sortingAlgorithm = new Insertion<Apple>();
-        testSort(sortingAlgorithm);
+        //populates random apples
+        testSort();
+
+        //calling sort function
+        sortingAlgorithm.sort(apples);
+
+        //checking if sorted array has any element which is less than preceeding one
+        assertTrue(test());
     }
 
     @Test
     @DisplayName("Testing Selection sort functionality")
     public void testSelectionSort() {
         sortingAlgorithm = new Selection<Apple>();
-        testSort(sortingAlgorithm);
+        //populates random apples
+        testSort();
+
+        //calling sort function
+        sortingAlgorithm.sort(apples);
+
+        //checking if sorted array has any element which is less than preceeding one
+        assertTrue(test());
     }
 
     @Test
     @DisplayName("Testing Shell sort functionality")
     public void testShellSort() {
-        sortingAlgorithm = new Shell<>();
-        testSort(sortingAlgorithm);
+        sortingAlgorithm = new Shell<Apple>();
+        //populates random apples
+        testSort();
+
+        //calling sort function
+        sortingAlgorithm.sort(apples);
+
+        //checking if sorted array has any element which is less than preceeding one
+        assertTrue(test());
     }
 
     @AfterEach
     void tearDown() {
         sortingAlgorithm = null;
         apples = null;
+        applesCopy = null;
     }
 }
\ No newline at end of file