diff --git a/src/test/java/edu/ntnu/idi/idatt2003/g40/mappe/PortfolioTest.java b/src/test/java/edu/ntnu/idi/idatt2003/g40/mappe/PortfolioTest.java
index 3518005..c8a5e3a 100644
--- a/src/test/java/edu/ntnu/idi/idatt2003/g40/mappe/PortfolioTest.java
+++ b/src/test/java/edu/ntnu/idi/idatt2003/g40/mappe/PortfolioTest.java
@@ -1,3 +1,80 @@
-public class PortfolioTest {
-    
-}
+package edu.ntnu.idi.idatt2003.g40.mappe;
+
+import org.junit.jupiter.api.Test;
+
+import java.math.BigDecimal;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class PortfolioTest {
+
+    @Test
+    void addShareAddsShareToPortfolio() {
+        Portfolio portfolio = new Portfolio();
+        Stock stock = new Stock("AAPL", "Apple", new BigDecimal("150"));
+        Share share = new Share(stock, new BigDecimal("2"), new BigDecimal("100"));
+
+        boolean result = portfolio.addShare(share);
+
+        assertTrue(result);
+        assertTrue(portfolio.contains(share));
+    }
+
+    @Test
+    void removeShareRemovesShareFromPortfolio() {
+        Portfolio portfolio = new Portfolio();
+        Stock stock = new Stock("TSLA", "Tesla", new BigDecimal("200"));
+        Share share = new Share(stock, new BigDecimal("1"), new BigDecimal("200"));
+
+        portfolio.addShare(share);
+        boolean result = portfolio.removeShare(share);
+
+        assertTrue(result);
+        assertFalse(portfolio.contains(share));
+    }
+
+    @Test
+    void getSharesReturnsAllShares() {
+        Portfolio portfolio = new Portfolio();
+
+        Stock stock = new Stock("AAPL", "Apple", new BigDecimal("150"));
+        Share share = new Share(stock, new BigDecimal("3"), new BigDecimal("150"));
+
+        portfolio.addShare(share);
+
+        List<Share> shares = portfolio.getShares();
+
+        assertEquals(1, shares.size());
+        assertTrue(shares.contains(share));
+    }
+
+    @Test
+    void getSharesWithSymbolReturnsMatchingShares() {
+        Portfolio portfolio = new Portfolio();
+
+        Stock apple = new Stock("AAPL", "Apple", new BigDecimal("150"));
+        Stock tesla = new Stock("TSLA", "Tesla", new BigDecimal("200"));
+
+        Share appleShare = new Share(apple, new BigDecimal("1"), new BigDecimal("150"));
+        Share teslaShare = new Share(tesla, new BigDecimal("1"), new BigDecimal("200"));
+
+        portfolio.addShare(appleShare);
+        portfolio.addShare(teslaShare);
+
+        List<Share> result = portfolio.getShares("AAPL");
+
+        assertEquals(1, result.size());
+        assertTrue(result.contains(appleShare));
+    }
+
+    @Test
+    void containsReturnsFalseWhenShareNotPresent() {
+        Portfolio portfolio = new Portfolio();
+
+        Stock stock = new Stock("NVDA", "Nvidia", new BigDecimal("800"));
+        Share share = new Share(stock, new BigDecimal("1"), new BigDecimal("800"));
+
+        assertFalse(portfolio.contains(share));
+    }
+}
\ No newline at end of file
diff --git a/src/test/java/edu/ntnu/idi/idatt2003/g40/mappe/PurchaseCalculatorTest.java b/src/test/java/edu/ntnu/idi/idatt2003/g40/mappe/PurchaseCalculatorTest.java
index 6737cf2..4ebae9c 100644
--- a/src/test/java/edu/ntnu/idi/idatt2003/g40/mappe/PurchaseCalculatorTest.java
+++ b/src/test/java/edu/ntnu/idi/idatt2003/g40/mappe/PurchaseCalculatorTest.java
@@ -1,3 +1,3 @@
 public class PurchaseCalculatorTest {
-    
+  
 }