From a103b348ed1ecf7902f9a570435868ec0b6e8bee Mon Sep 17 00:00:00 2001
From: EspenTinius <tiniusespen@gmail.com>
Date: Sat, 14 Mar 2026 08:02:38 +0100
Subject: [PATCH] Unit test SaleCalculator class

---
 .../g40/mappe/SaleCalculatorTest.java         | 58 ++++++++++++++++++-
 1 file changed, 55 insertions(+), 3 deletions(-)

diff --git a/src/test/java/edu/ntnu/idi/idatt2003/g40/mappe/SaleCalculatorTest.java b/src/test/java/edu/ntnu/idi/idatt2003/g40/mappe/SaleCalculatorTest.java
index 5422865..3b7a0c6 100644
--- a/src/test/java/edu/ntnu/idi/idatt2003/g40/mappe/SaleCalculatorTest.java
+++ b/src/test/java/edu/ntnu/idi/idatt2003/g40/mappe/SaleCalculatorTest.java
@@ -1,3 +1,55 @@
-public class SaleCalculatorTest {
-    
-}
+package edu.ntnu.idi.idatt2003.g40.mappe;
+
+import org.junit.jupiter.api.Test;
+
+import java.math.BigDecimal;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class SaleCalculatorTest {
+
+    @Test
+    void calculateGrossReturnsSalesPriceTimesQuantity() {
+        Stock stock = new Stock("AAPL", "Apple", new BigDecimal("150"));
+        Share share = new Share(stock, new BigDecimal("2"), new BigDecimal("100"));
+        SaleCalculator calculator = new SaleCalculator(share);
+
+        assertEquals(new BigDecimal("300"), calculator.calculateGross());
+    }
+
+    @Test
+    void calculateCommissionReturnsOnePercentOfGross() {
+        Stock stock = new Stock("AAPL", "Apple", new BigDecimal("150"));
+        Share share = new Share(stock, new BigDecimal("2"), new BigDecimal("100"));
+        SaleCalculator calculator = new SaleCalculator(share);
+
+        assertEquals(new BigDecimal("3.00"), calculator.calculateCommission());
+    }
+
+    @Test
+    void calculateTaxReturnsThirtyPercentOfProfitWhenProfitIsPositive() {
+        Stock stock = new Stock("AAPL", "Apple", new BigDecimal("150"));
+        Share share = new Share(stock, new BigDecimal("2"), new BigDecimal("100"));
+        SaleCalculator calculator = new SaleCalculator(share);
+
+        assertEquals(new BigDecimal("29.1000"), calculator.calculateTax());
+    }
+
+    @Test
+    void calculateTaxReturnsZeroWhenProfitIsZeroOrNegative() {
+        Stock stock = new Stock("AAPL", "Apple", new BigDecimal("90"));
+        Share share = new Share(stock, new BigDecimal("2"), new BigDecimal("100"));
+        SaleCalculator calculator = new SaleCalculator(share);
+
+        assertEquals(BigDecimal.ZERO, calculator.calculateTax());
+    }
+
+    @Test
+    void calculateTotalReturnsGrossMinusCommissionMinusTax() {
+        Stock stock = new Stock("AAPL", "Apple", new BigDecimal("150"));
+        Share share = new Share(stock, new BigDecimal("2"), new BigDecimal("100"));
+        SaleCalculator calculator = new SaleCalculator(share);
+
+        assertEquals(new BigDecimal("267.9000"), calculator.calculateTotal());
+    }
+}
\ No newline at end of file