diff --git a/src/test/java/ShareTest.java b/src/test/java/ShareTest.java
new file mode 100644
index 0000000..ba6dc76
--- /dev/null
+++ b/src/test/java/ShareTest.java
@@ -0,0 +1,71 @@
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+import java.math.BigDecimal;
+
+
+public class ShareTest {
+
+    @Test
+    void testShareConstructor() {
+
+        Stock stock = new Stock("AAPL", "Apple", new BigDecimal("150"));
+        BigDecimal quantity = new BigDecimal("10");
+        BigDecimal purchasePrice = new BigDecimal("140");
+
+        Share share = new Share(stock, quantity, purchasePrice);
+        assertNotNull(share);
+    }
+
+    @Test
+    void testGetStock() {
+
+        Stock stock = new Stock("AAPL", "Apple", new BigDecimal("150"));
+        Share share = new Share(stock, new BigDecimal("10"), new BigDecimal("140"));
+
+        Stock result = share.getStock();
+
+        assertEquals(stock, result);
+    }
+
+    @Test
+    void testGetQuantity() {
+
+        Stock stock = new Stock("AAPL", "Apple", new BigDecimal("150"));
+        Share share = new Share(stock, new BigDecimal("10"), new BigDecimal("140"));
+
+        BigDecimal result = share.getQuantity();
+
+        assertEquals(new BigDecimal("10"), result);
+    }
+
+    @Test
+    void testGetPurchasePrice() {
+
+        Stock stock = new Stock("AAPL", "Apple", new BigDecimal("150"));
+        Share share = new Share(stock, new BigDecimal("10"), new BigDecimal("140"));
+
+        BigDecimal result = share.getPurchasePrice();
+
+        assertEquals(new BigDecimal("140"), result);
+    }
+
+    @Test
+    void testNullStock() {
+
+        Share share = new Share(null, new BigDecimal("10"), new BigDecimal("100"));
+
+        assertNull(share.getStock());
+    }
+
+    @Test
+    void testNegativePrice() {
+
+        Stock stock = new Stock("AAPL", "Apple", new BigDecimal("150"));
+        Share share = new Share(stock, new BigDecimal("10"), new BigDecimal("-50"));
+
+        assertEquals(new BigDecimal("-50"), share.getPurchasePrice());
+    }
+
+    
+}
diff --git a/target/classes/PurchaseCalculator.class b/target/classes/PurchaseCalculator.class
index c50d57d..bab65f2 100644
Binary files a/target/classes/PurchaseCalculator.class and b/target/classes/PurchaseCalculator.class differ