diff --git a/src/test/java/PortfolioTest.java b/src/test/java/PortfolioTest.java
new file mode 100644
index 0000000..57ecb47
--- /dev/null
+++ b/src/test/java/PortfolioTest.java
@@ -0,0 +1,37 @@
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+import java.math.BigDecimal;
+
+public class PortfolioTest {
+
+    @Test
+    void testAddShare() {
+        Portfolio portfolio = new Portfolio();
+
+        Stock stock = new Stock("AAPL", "Apple", new BigDecimal("150"));
+        Share share = new Share(stock, new BigDecimal("10"), new BigDecimal("140"));
+
+        boolean result = portfolio.addShare(share);
+
+        assertTrue(result);
+        assertTrue(portfolio.contains(share));
+    }
+
+    @Test
+    void testRemoveShare() {
+        Portfolio portfolio = new Portfolio();
+
+        Stock stock = new Stock("AAPL", "Apple", new BigDecimal("150"));
+        Share share = new Share(stock, new BigDecimal("10"), new BigDecimal("140"));
+
+        portfolio.addShare(share);
+
+        boolean result = portfolio.removeShare(share);
+
+        assertTrue(result);
+        assertFalse(portfolio.contains(share));
+    }
+
+    
+}