Fix/test" Fix portfolio rounding bug, adding test for that

src/main/java/millions/controller/fileIO/StockFileReader.java

@@ -1,6 +1,10 @@
 package millions.controller.fileIO;
 
-import java.io.*;
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+import java.io.Reader;
 import java.nio.file.Path;
 import java.util.ArrayList;
 import java.util.List;
@@ -16,8 +20,12 @@ public StockFileReader(Path path) {
   public List<String> readFile() {
     File file = new File(filePath.toString());
     List<String> lines = new ArrayList<>();
-    try (Reader reader = new FileReader(file); BufferedReader bufferedReader = new BufferedReader(reader)) {
-      lines = bufferedReader.readAllLines();
+    try (Reader reader = new FileReader(file);
+         BufferedReader bufferedReader = new BufferedReader(reader)) {
+      String line;
+      while ((line = bufferedReader.readLine()) != null) {
+        lines.add(line);
+      }
     } catch (IOException e) {
       e.printStackTrace();
     }

src/main/java/millions/model/calculators/SaleCalculator.java

@@ -23,7 +23,7 @@ public BigDecimal calculateGross() {
 
   @Override
   public BigDecimal calculateCommission() {
-    return this.calculateGross().divide(new BigDecimal("100"), RoundingMode.HALF_UP);
+    return this.calculateGross().divide(new BigDecimal("100"), 2, RoundingMode.HALF_UP);
   }
 
   @Override
@@ -33,11 +33,14 @@ public BigDecimal calculateTax() {
         this.calculateGross().subtract(this.calculateCommission()).subtract(purchaseCosts);
     return earnings
         .multiply(new BigDecimal("30"))
-        .divide(new BigDecimal("100"), RoundingMode.HALF_UP);
+        .divide(new BigDecimal("100"), 2, RoundingMode.HALF_UP);
   }
 
   @Override
   public BigDecimal calculateTotal() {
-    return this.calculateGross().subtract(this.calculateCommission()).subtract(this.calculateTax());
+    return this.calculateGross()
+        .subtract(this.calculateCommission())
+        .subtract(this.calculateTax())
+        .stripTrailingZeros();
   }
 }

src/test/java/millions/PortfolioTest.java

@@ -3,7 +3,6 @@
 import static org.junit.jupiter.api.Assertions.*;
 
 import java.math.BigDecimal;
-
 import millions.model.Portfolio;
 import millions.model.Share;
 import millions.model.Stock;
@@ -56,6 +55,17 @@ public void testGettersAndSetters() {
     assertEquals(1, portfolio.getShares().size());
   }
 
+  @Test
+  public void testGetNetWorth() {
+    Portfolio portfolio = new Portfolio();
+    Stock stock = new Stock("PEAR", "Pear Inc.", BigDecimal.valueOf(100));
+    Share share = new Share(stock, 1, BigDecimal.valueOf(50));
+
+    portfolio.addShare(share);
+
+    assertEquals(new BigDecimal("84.3"), portfolio.getNetWorth());
+  }
+
   @Test
   public void testNullsAndInvalid() {
     Stock stock1 = new Stock("PEAR", "Pear Inc.", BigDecimal.valueOf(300));